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https://reference.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
86
GRADE
B
FIX
0
REVIEW
3
PASS
6
INFO
0
Probed from New York, United Stated
301 Moved Permanently
Checks
9
6 PASS 3 REVIEW
C
IPv6 Readiness
Action
No IPv6 support
REVIEW
No IPv6 support
Info::
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

B
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
REVIEW
www/non-www, trailing slash, HTTP→HTTPS
Critical::
Both www and non-www versions serve content
Got: Both variants return 200 Expected: One variant 301-redirects to the other
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

200https://www.reference.com/
200https://reference.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://reference.com/ → https://www.reference.com/

Consistent

B
TLS Certificate Expiry & Recommendations
89 days until leaf cert expires — 3 issues to address
REVIEW

Certificate validity

89
days left
0d 30d 60d 90d+

Recommended actions

  • Enable HSTS: Strict-Transport-Security: max-age=31536000; includeSubDomains
  • 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+
DNS Records
1 A records, 7 ms lookup
PASS
1 A records, 7 ms lookup
Info::
Resolves to 1 IPv4 address(es)
Got: 199.232.38.114
Info::
Single A record — no DNS redundancy
Multiple A records provide failover if one server goes down.
Info::
No IPv6 (AAAA) records
Info::
4 nameserver(s) configured
Got: dns1.p03.nsone.net, dns2.p03.nsone.net, dns3.p03.nsone.net, dns4.p03.nsone.net
Info::
2 mail exchanger(s) configured
Info::
CAA records not checked
CAA record lookup requires a specialized DNS resolver. This check will be available in a future update.
Info::
SPF record present in TXT
Info::
DNS resolution time: 7 ms
Got: 7 ms
A199.232.38.114
AAAA—
CNAME—
NSdns1.p03.nsone.net, dns2.p03.nsone.net, dns3.p03.nsone.net, dns4.p03.nsone.net
MX
0 mxb-0015af01.gslb.pphosted.com
0 mxa-0015af01.gslb.pphosted.com
TXT
SPF v=spf1 redirect=ask.com
ms=ms24275044
google-site-verification=bnVDUQezVF3HHsm8M_zZc30ETcHbvQD27yYnT1eaZQk
_globalsign-domain-verification=ZlaZzwu0TA07KjmzBDYR4ZPfHFSZbKX5HfiTwBiGBB
facebook-domain-verification=lsre1s2c9d25anunhzhg1v420ucqg7
_globalsign-domain-verification=2wRqY6IrIINLY7B8Qcp-qur9HsiRTO04g4gwsMmFy3
google-site-verification=yCP56rQx9YJdQhsBr77Qm4B3BRbgimgzFE0PtI94uoQ
CAALookup not available with standard resolver
Resolved in 7 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

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.

A
Redirect Chain
1 redirect(s), 33 ms total
PASS
1 redirect(s), 33 ms total
Info::
Single redirect
Got: https://reference.com → https://www.reference.com/ (301)
Info::
WWW normalization redirect

https://reference.com

16 ms · HTTP/1.1

301

https://www.reference.com/

18 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://reference.com30116 msHTTP/1.1
2https://www.reference.com/20018 msHTTP/1.1

See the visual redirect chain in the HTTP Probe tab →

A+
Crawlability
robots.txt present, sitemap with 203 URLs
PASS
robots.txt present, sitemap with 203 URLs
Info::
robots.txt is present
Got: 819 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 203 entries
Info::
Sitemap index with 203 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 819 B Sitemaps referenced 1 User-agents Google-Display-Ads-Bot, Adsbot-Google, proximic, SemrushBot-SA, Google-InspectionTool, AdsBot-Google-Mobile, Teoma, netseer, AdIdxBot, grapeshot, GPTBot, *, SemrushBot, Mediapartners-Google Blocking No — crawling allowed
## Reference robots.txt

User-agent: *
Disallow: /web
Disallow: /Web
Disallow: /WEB
Disallow: /browse
Disallow: /article/
Disallow: /slideshow/
Disallow: /fragment
Disallow: /_clk
Disallow: /slp
Disallow: /log/
Disallow: *ad=
Disallow: *aq=
Disallow: /wp-admin/
Allow: /wp-admin/admin-ajax.php

User-agent: SemrushBot-SA
Disallow: /

User-agent: SemrushBot
Disallow: /

User-agent: Mediapartners-Google
Disallow:

User-agent: Google-Display-Ads-Bot
Allow: /

User-agent: Google-InspectionTool
Allow: /

User-agent: Adsbot-Google
Disallow:

User-agent: AdsBot-Google-Mobile
Disallow:

User-agent: Teoma
Disallow:

User-agent: netseer
Disallow:

User-agent: AdIdxBot
Disallow:

User-agent: proximic
Disallow:

User-agent: grapeshot
Disallow:

User-agent: GPTBot
Disallow: /

Sitemap: https://www.reference.com/sitemap.xml
sitemap.xml 200 OK
Type Sitemap Index URLs 203 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
reference.com — via MarkMonitor Inc., 31 years, 8 months old, hosted on Fastly
PASS
reference.com — via MarkMonitor Inc., 31 years, 8 months old, hosted on Fastly
Info::
Domain registered until Jul 27, 2026 (3 months remaining)
Info::
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.
Info::
Registrar: MarkMonitor Inc.
Warning::
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.
Info::
Hosting: Fastly
Got: AS54113
Domain expiry

11 days

July 27, 2026

SSL certificate

89 days

Issued by GlobalSign nv-sa

Domain age

31 years, 8 months

Registered January 25, 1995

DNSSEC

Not enabled

Protects against DNS spoofing

Hosting

Fastly

ASN AS54113

199.232.38.114

Registrar

MarkMonitor Inc.

Unlocked 4 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Renew the domain or enable auto-renewal to prevent accidental expiry
  • Enable DNSSEC to protect visitors from DNS spoofing
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar MarkMonitor Inc.
Created January 25, 1995 (31 years, 8 months ago)
Expires July 27, 2026 (3 months)
Last Updated June 25, 2024
Name Servers dns1.p03.nsone.net, dns2.p03.nsone.net, dns3.p03.nsone.net, dns4.p03.nsone.net
DNSSEC Not enabled
Hosting
IP Address 199.232.38.114
ASN AS54113 (FASTLY - Fastly, Inc., US)
Provider Fastly
Data source: rdap (0.1s)

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

A+
HTTP Probe Timing
Total 20 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
5 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
1 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
7 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
21 ms
Total Time Total request time from DNS lookup through full response.
21 ms

Connection waterfall

DNS Lookup 5 ms TCP Connect 1 ms TLS Handshake 7 ms Server Processing 8 ms Content Transfer 0 ms
A+
CDN & Delivery
Fastly (HIT)
PASS
Fastly (HIT)
Info::
Site is served via Fastly CDN
Got: x-served-by: cache-lga21944-LGA
Info::
CDN cache status: HIT
CDN Detected: Fastly
Provider Fastly Cache Status HIT Evidence x-served-by: cache-lga21944-LGA
All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

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