Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.

SCORE

GRADE

FIX

REVIEW

PASS

INFO

Probed from Madrid, Spain

301 Moved Permanently

Checks

2 PASS 6 REVIEW 1 FIX

CDN & Delivery

Action

No CDN detected

FIX

No CDN detected

A CDN can significantly improve load times for users around the world by caching content at edge nodes closer to them.

No CDN detected

Consider using a CDN to improve global delivery speed and reduce origin load.

DNS Records

1 A records, 647 ms lookup

REVIEW

1 A records, 647 ms lookup

Resolves to 1 IPv4 address(es)

Got: 180.76.198.147

Single A record — no DNS redundancy

Multiple A records provide failover if one server goes down.

No IPv6 (AAAA) records

CNAME record at zone apex

A CNAME at the zone apex can break MX and NS records. Use ALIAS/ANAME or A records instead.

Got: oschina.net-38a6d2f2a9a.baiduads.com

4 nameserver(s) configured

Got: sv2.bdydns.cn, sv1.bdydns.cn, sv3.bdydns.cn, sv4.bdydns.cn

1 mail exchanger(s) configured

CAA records not checked

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

SPF record present in TXT

DNS resolution is slow (647 ms)

Slow DNS adds latency to every page load. Consider a faster DNS provider.

Got: 647 ms

A	180.76.198.147
AAAA	—
CNAME	oschina.net-38a6d2f2a9a.baiduads.com
NS	sv2.bdydns.cn, sv1.bdydns.cn, sv3.bdydns.cn, sv4.bdydns.cn
MX	1 mail.oschina.net
TXT	SPF v=spf1 a mx -all google-site-verification=uXvlKWqXek6iX4wldCmmqq5tfq1u08TBShwy8rkI8Yc google-site-verification=4a_P6YLDLtQPzwHv5oppFRMyZHUW_TL-31EIi2mm0Yw
CAA	Lookup not available with standard resolver

Resolved in 647 ms

Multiple A records provide failover if one server goes down.

Why this matters

Single A record means a single point of failure — if that IP goes down, your site is unreachable until DNS TTL expires.

Learn more ▾

Add multiple A records for round-robin failover, or use a managed DNS provider with health-checked failover (Route 53, Cloudflare, NS1). Short TTL (60-300s) lets clients recover faster on outages.

Source: SRE practice / DNS architecture

A CNAME at the zone apex can break MX and NS records. Use ALIAS/ANAME or A records instead.

Why this matters

CNAME at the apex (example.com) breaks every other apex record (MX, TXT, NS) — DNS-protocol violation per RFC 1034.

Learn more ▾

RFC 1034 forbids CNAME alongside other records at the same name. Some DNS providers offer ALIAS / ANAME / flattened-CNAME records that work around this — use those instead. Otherwise apex-level CNAME breaks email (no MX), domain ownership verification (no TXT), and more.

Source: RFC 1034

CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.

Why this matters

Informational: CAA (Certification Authority Authorization) records weren't checked in this scan.

Slow DNS adds latency to every page load. Consider a faster DNS provider.

Why this matters

DNS resolution is slow — anycast DNS providers (Cloudflare, Route 53) typically resolve <50ms globally.

Source: DNS performance benchmarks

Redirect Chain

1 redirect(s), 3788 ms total

REVIEW

1 redirect(s), 3788 ms total

Single redirect

Got: https://oschina.net → https://www.oschina.net/ (301)

WWW normalization redirect

Redirect overhead: 3788 ms total

Got: 3788 ms

https://oschina.net

1668 ms · HTTP/1.1

301

https://www.oschina.net/

2120 ms · HTTP/1.1 FINAL

#	URL	Status	Time	Protocol	Server
1	https://oschina.net	301	1668 ms	HTTP/1.1	ADAS/1.0.214
2	https://www.oschina.net/	200	2120 ms	HTTP/1.1	ADAS/1.0.214

See the visual redirect chain in the HTTP Probe tab →

IPv6 Readiness

Action

No IPv6 support

REVIEW

No IPv6 support

No IPv6 (AAAA) records found

IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

No IPv6 Support

About 40% of internet users have IPv6. Consider adding AAAA records.

IPv6 support is increasingly important for global accessibility. About 40% of internet users have IPv6 connectivity.

Why this matters

No AAAA records — same impact as 'no IPv6 (AAAA) records'; IPv6-preferring clients pay extra latency falling back to IPv4.

Source: Google IPv6 stats

URL Variants

www/non-www, trailing slash, HTTP→HTTPS

REVIEW

www/non-www, trailing slash, HTTP→HTTPS

Both www and non-www versions serve content

Got: Both variants return 200 Expected: One variant 301-redirects to the other

HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.oschina.net/

200https://oschina.net/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://oschina.net/ → https://www.oschina.net/

Consistent

HTTP Probe Timing

Action

Total 1983 ms — DNS, TCP, TLS, TTFB, content transfer breakdown

REVIEW

DNS Lookup

988 ms

TCP Connect

231 ms

TLS Handshake

465 ms

Time to First Byte

1.98 s

Total Time

1.98 s

Connection waterfall

DNS Lookup 988 ms TCP Connect 231 ms TLS Handshake 465 ms Server Processing 298 ms Content Transfer 0 ms

TLS Certificate Expiry & Recommendations

50 days until leaf cert expires — 4 issues to address

REVIEW

Certificate validity

days left

0d 30d 60d 90d+

Recommended actions

Extend HSTS max-age to at least 31536000 (1 year) to meet the preload list criteria
Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
Enable DNSSEC on your domain for DNS spoofing protection
Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy

A+

Crawlability

robots.txt present, sitemap with 500 URLs

PASS

robots.txt present, sitemap with 500 URLs

robots.txt is present

Got: 10240 bytes

sitemap.xml is present

sitemap.xml is valid XML

sitemap.xml contains 500 entries

robots.txt references sitemap

robots.txt 200 OK

Size 10240 B Sitemaps referenced 152 User-agents * Blocking No — crawling allowed

### BEGIN FILE ###
#
# allow-all
#
#

User-agent: *

Disallow: /action/
Disallow: /admin/
Disallow: /code/download_src
Disallow: /webVisit/
Disallow: /search/

Sitemap: https://www.oschina.net/dsitemap/lastest_news
Sitemap: https://www.oschina.net/dsitemap/lastest_all
Sitemap: https://www.oschina.net/dsitemap/lastest_questions

Sitemap: https://www.oschina.net/sitemap/news.xml.gz
Sitemap: https://www.oschina.net/sitemap/projects.xml.gz
Sitemap: https://www.oschina.net/sitemap/translates.xml.gz
Sitemap: https://www.oschina.net/sitemap/threads.xml.gz
Sitemap: https://www.oschina.net/sitemap/keywords.xml.gz

Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=1
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=2
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=3
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=4
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=5
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=6
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=7
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=8
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=9
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=10
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=11
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=12
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=13
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=14
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=15
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=16
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=17
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=18
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=19
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=20
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=21
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=22
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=23
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=24
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=25
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=26
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=27
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=28
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=29
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=30
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=31
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=32
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=33
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=34
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=35
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=36
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=37
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=38
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=39
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=40
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=41
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=42
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=43
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=44
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=45
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=46
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=47
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=48
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=49
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=50
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=51
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=52
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=53
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=54
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=55
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=56
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=57
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=58
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=59
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=60
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=61
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=62
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=63
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=64
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=65
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=66
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=67
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=68
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=69
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=70
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=71
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=72
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=73
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=74
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=75
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=76
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=77
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=78
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=79
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=80
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=81
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=82
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=83
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=84
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=85
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=86
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=87
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=88
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=89
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=90
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=91
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=92
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=93
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=94
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=95
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=96
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=97
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=98
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=99
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=100
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=101
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=102
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=103
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=104
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=105
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=106
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=107
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=108
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=109
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=110
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=111
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=112
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=113
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=114
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=115
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=116
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=117
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=118
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=119
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=120
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=121
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=122
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=123
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=124
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=125
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=126
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=127
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=128
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=129
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=130
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=131
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=132
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=133
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=134
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=135
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=136
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=137
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=138
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=139
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=140
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=141
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=142
Sitemap: https://www.oschina.net/keywords_p1.xml?size=3000&page=143
Sitemap: ht

sitemap.xml 200 OK

Type URL Set URLs 500 entries Valid XML Yes

Sample URLs:

A+

Domain Intelligence

oschina.net — via Alibaba Cloud Computing (Beijing) Co., Ltd., 17 years, 11 months old, hosted on CHINATELECOM-SHANDONG-JINAN-IDC Jinan,250000, CN

PASS

oschina.net — via Alibaba Cloud Computing (Beijing) Co., Ltd., 17 years, 11 months old, hosted on CHINATELECOM-SHANDONG-JINAN-IDC Jinan,250000, CN

Domain registered until Aug 16, 2027 (1 years, 4 months remaining)

DNSSEC is not enabled

DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.

Registrar: Alibaba Cloud Computing (Beijing) Co., Ltd.

Registrar lock is NOT enabled

The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.

Hosting: CHINATELECOM-SHANDONG-JINAN-IDC Jinan,250000, CN

Got: AS58540

Domain expiry

397 days

August 16, 2027

SSL certificate

50 days

Issued by TrustAsia Technologies, Inc.

Domain age

17 years, 11 months

Registered August 16, 2008

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

CHINATELECOM-SHANDONG-JINAN-IDC Jinan,250000, CN

ASN AS58540

180.76.198.147

Registrar

Alibaba Cloud Computing (Beijing) Co., Ltd.

Unlocked 4 NS records

Expiry timeline

Today

+1 year

Domain expiry SSL expiry Danger zone (≤30 days)

Recommended actions

Enable DNSSEC to protect visitors from DNS spoofing
Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers

Registrar Alibaba Cloud Computing (Beijing) Co., Ltd.

Created August 16, 2008 (17 years, 11 months ago)

Expires August 16, 2027 (1 years, 4 months)

Last Updated April 1, 2025

Name Servers sv1.bdydns.cn, sv2.bdydns.cn, sv3.bdydns.cn, sv4.bdydns.cn

DNSSEC Not enabled

Hosting

IP Address 180.76.198.147

ASN AS58540 (CHINATELECOM-SHANDONG-JINAN-IDC Jinan,250000, CN)

Provider CHINATELECOM-SHANDONG-JINAN-IDC Jinan,250000, CN

Data source: rdap (0.8s)

DNSSEC protects against DNS spoofing attacks. While not required, enabling DNSSEC adds an additional layer of security. Contact your DNS provider to enable it.

Why this matters

Without DNSSEC, an attacker who can poison your DNS can hijack your domain — and SSL certs alone don't stop them.

Learn more ▾

DNSSEC adds cryptographic signatures to DNS records, preventing forged responses from poisoning resolver caches. Without it, an attacker who controls the network path can redirect your domain to a malicious server before any HTTPS handshake happens. Most modern registrars (Cloudflare, Google Domains, Route 53) enable it with one toggle.

Source: ICANN / RFC 4033

The domain can be transferred without an unlock step. Enable registrar lock (clientTransferProhibited) in your registrar's control panel to protect against unauthorized or accidental transfers.

Why this matters

Without registrar lock, an attacker who phishes your registrar credentials can transfer the domain in minutes — total brand hijack.

Learn more ▾

Registrar lock (clientTransferProhibited, clientUpdateProhibited, clientDeleteProhibited) requires extra verification before any transfer/update/delete. Every major registrar offers it free. Combined with 2FA on your registrar account, it's the strongest defense against domain hijacking.

Source: ICANN / domain-security best practice

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.