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https://f-droid.org

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
100
GRADE
A+
FIX
1
REVIEW
1
PASS
7
INFO
0
Probed from Madrid, Spain
200 OK
Checks
9
7 PASS 1 REVIEW 1 FIX
D
CDN & Delivery
Action
No CDN detected
FIX
No CDN detected
Warning::
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.

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

Certificate validity

68
days left
0d 30d 60d 90d+

Recommended actions

  • Add includeSubDomains to the HSTS directive
  • Add the preload directive and submit to hstspreload.org once max-age + includeSubDomains are in place
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A+
DNS Records
3 A records, 27 ms lookup
PASS
3 A records, 27 ms lookup
Info::
Resolves to 3 IPv4 address(es)
Got: 65.21.79.229, 37.218.247.73, 37.218.243.72
Info::
Has 3 IPv6 (AAAA) record(s)
Got: 2a01:4f9:3b:546d::2, 2a00:c6c0:0:153:3::1, 2a00:c6c0:0:155:1::1
Info::
2 nameserver(s) configured
Got: dns1.registrar-servers.com, dns2.registrar-servers.com
Info::
1 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: 27 ms
Got: 27 ms
A65.21.79.229, 37.218.247.73, 37.218.243.72
AAAA2a01:4f9:3b:546d::2, 2a00:c6c0:0:153:3::1, 2a00:c6c0:0:155:1::1
CNAME—
NSdns1.registrar-servers.com, dns2.registrar-servers.com
MX
10 hosted.mailcow.de
TXT
SPF v=spf1 include:spf.mailcow.de ~all
CAALookup not available with standard resolver
Resolved in 27 ms

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
No redirects — direct access
PASS
No redirects — direct access
Info::
No redirects — direct access
Got: https://f-droid.org

https://f-droid.org

214 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://f-droid.org200214 msHTTP/1.1nginx/1.22.1
A+
IPv6 Readiness
IPv6 reachable (45 ms)
PASS
IPv6 reachable (45 ms)
Info::
IPv6 is configured and reachable at 2a01:4f9:3b:546d::2, 2a00:c6c0:0:153:3::1, 2a00:c6c0:0:155:1::1
Got: 45 ms connect
IPv6 Ready
AAAA Records 2a01:4f9:3b:546d::2, 2a00:c6c0:0:153:3::1, 2a00:c6c0:0:155:1::1 Connection Reachable (45 ms)
A+
Crawlability
robots.txt present, sitemap with 5002 URLs
PASS
robots.txt present, sitemap with 5002 URLs
Info::
robots.txt is present
Got: 774 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 5002 entries
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 774 B Sitemaps referenced 1 User-agents Diffbot, GoogleOther, YouBot, *, GPTBot, Omgilibot, anthropic-ai, Applebot-Extended, ChatGPT-User, FacebookBot, ImagesiftBot, meta-externalagent, Omgili, PerplexityBot, Bytespider, CCBot, Claude-Web, ClaudeBot, cohere-ai, Google-Extended, Amazonbot Blocking No — crawling allowed
User-agent: Amazonbot
Disallow: /
User-agent: anthropic-ai
Disallow: /
User-agent: Applebot-Extended
Disallow: /
User-agent: Bytespider
Disallow: /
User-agent: CCBot
Disallow: /
User-agent: ChatGPT-User
Disallow: /
User-agent: Claude-Web
Disallow: /
User-agent: ClaudeBot
Disallow: /
User-agent: cohere-ai
Disallow: /
User-agent: Diffbot
Disallow: /
User-agent: FacebookBot
Disallow: /
User-agent: Google-Extended
Disallow: /
User-agent: GoogleOther
Disallow: /
User-agent: GPTBot
Disallow: /
User-agent: ImagesiftBot
Disallow: /
User-agent: meta-externalagent
Disallow: /
User-agent: Omgili
Disallow: /
User-agent: Omgilibot
Disallow: /
User-agent: PerplexityBot
Disallow: /
User-agent: YouBot
Disallow: /

User-agent: *
Disallow:

Sitemap: https://f-droid.org/sitemap.xml
sitemap.xml 200 OK
Type URL Set URLs 5002 entries Valid XML Yes
Sample URLs:
A+
URL Variants
www/non-www, trailing slash, HTTP→HTTPS
PASS
www/non-www, trailing slash, HTTP→HTTPS
Info::
www/non-www redirect configured correctly (preferred: non-www)
Info::
HTTP correctly 301-redirects to HTTPS

www / non-www

301https://www.f-droid.org/
200https://f-droid.org/

Preferred variant: non-www

HTTP → HTTPS

301http://f-droid.org/ → https://f-droid.org/

Consistent

A+
Domain Intelligence
f-droid.org — via NameCheap, Inc., 15 years, 9 months old
PASS
f-droid.org — via NameCheap, Inc., 15 years, 9 months old
Info::
Domain registered until Sep 29, 2035 (9 years, 6 months remaining)
Info::
DNSSEC is enabled
Info::
Registrar: NameCheap, 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.
Domain expiry

3360 days

September 29, 2035

SSL certificate

68 days

Issued by Let's Encrypt

Domain age

15 years, 9 months

Registered September 29, 2010

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

Unknown

2a01:4f9:3b:546d::2

Registrar

NameCheap, Inc.

Unlocked 2 NS records
Expiry timeline
Today
+1 year
Domain expiry SSL expiry Danger zone (≤30 days)
Recommended actions
  • Enable registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar NameCheap, Inc.
Created September 29, 2010 (15 years, 9 months ago)
Expires September 29, 2035 (9 years, 6 months)
Last Updated February 2, 2026
Name Servers dns1.registrar-servers.com, dns2.registrar-servers.com
DNSSEC Enabled
Hosting
IP Address 2a01:4f9:3b:546d::2
Data source: rdap (0.5s)

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 246 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
PASS
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
27 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
30 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
33 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
246 ms
Total Time Total request time from DNS lookup through full response.
246 ms

Connection waterfall

DNS Lookup 27 ms TCP Connect 30 ms TLS Handshake 33 ms Server Processing 156 ms Content Transfer 0 ms
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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