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https://huggingface.co

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
88
GRADE
B
FIX
1
REVIEW
1
PASS
7
INFO
0
Probed from Santa Clara, United Stated
200 OK
Checks
9
7 PASS 1 REVIEW 1 FIX
F
IPv6 Readiness
Action
IPv6 records exist but unreachable
FIX
IPv6 records exist but unreachable
Warning::
IPv6 DNS records exist but server is not reachable
Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.
Got: 2600:9000:234c:9a00:17:b174:6d00:93a1, 2600:9000:234c:fc00:17:b174:6d00:93a1, 2600:9000:234c:5e00:17:b174:6d00:93a1, 2600:9000:234c:400:17:b174:6d00:93a1, 2600:9000:234c:3200:17:b174:6d00:93a1, 2600:9000:234c:f400:17:b174:6d00:93a1, 2600:9000:234c:b800:17:b174:6d00:93a1, 2600:9000:234c:f600:17:b174:6d00:93a1
Info::
IPv6 connection error
Got: dial tcp6 [2600:9000:234c:9a00:17:b174:6d00:93a1]:443: connect: network is unreachable
IPv6 Misconfigured
AAAA Records 2600:9000:234c:9a00:17:b174:6d00:93a1, 2600:9000:234c:fc00:17:b174:6d00:93a1, 2600:9000:234c:5e00:17:b174:6d00:93a1, 2600:9000:234c:400:17:b174:6d00:93a1, 2600:9000:234c:3200:17:b174:6d00:93a1, 2600:9000:234c:f400:17:b174:6d00:93a1, 2600:9000:234c:b800:17:b174:6d00:93a1, 2600:9000:234c:f600:17:b174:6d00:93a1 Connection UNREACHABLE

Having AAAA records but an unreachable server is worse than no AAAA — clients may experience delays before falling back to IPv4.

Why this matters

Advertising IPv6 (AAAA records) without a reachable server means IPv6-preferring clients silently fail every connection.

Learn more ▾

Modern browsers prefer IPv6 if AAAA exists (Happy Eyeballs algorithm). If the IPv6 server isn't reachable, browsers fall back to IPv4 — but with seconds of added latency per request. Either fix IPv6 reachability or remove the AAAA records.

Source: RFC 8305 (Happy Eyeballs)

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

Certificate validity

173
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
4 A records, 56 ms lookup
PASS
4 A records, 56 ms lookup
Info::
Resolves to 4 IPv4 address(es)
Got: 108.138.246.79, 108.138.246.85, 108.138.246.67, 108.138.246.71
Info::
Has 8 IPv6 (AAAA) record(s)
Got: 2600:9000:234c:9a00:17:b174:6d00:93a1, 2600:9000:234c:fc00:17:b174:6d00:93a1, 2600:9000:234c:5e00:17:b174:6d00:93a1, 2600:9000:234c:400:17:b174:6d00:93a1, 2600:9000:234c:3200:17:b174:6d00:93a1, 2600:9000:234c:f400:17:b174:6d00:93a1, 2600:9000:234c:b800:17:b174:6d00:93a1, 2600:9000:234c:f600:17:b174:6d00:93a1
Info::
4 nameserver(s) configured
Got: ns-137.awsdns-17.com, ns-919.awsdns-50.net, ns-1452.awsdns-53.org, ns-1955.awsdns-52.co.uk
Info::
5 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: 56 ms
Got: 56 ms
A108.138.246.79, 108.138.246.85, 108.138.246.67, 108.138.246.71
AAAA2600:9000:234c:9a00:17:b174:6d00:93a1, 2600:9000:234c:fc00:17:b174:6d00:93a1, 2600:9000:234c:5e00:17:b174:6d00:93a1, 2600:9000:234c:400:17:b174:6d00:93a1, 2600:9000:234c:3200:17:b174:6d00:93a1, 2600:9000:234c:f400:17:b174:6d00:93a1, 2600:9000:234c:b800:17:b174:6d00:93a1, 2600:9000:234c:f600:17:b174:6d00:93a1
CNAME—
NSns-137.awsdns-17.com, ns-919.awsdns-50.net, ns-1452.awsdns-53.org, ns-1955.awsdns-52.co.uk
MX
1 aspmx.l.google.com
5 alt2.aspmx.l.google.com
5 alt1.aspmx.l.google.com
10 alt3.aspmx.l.google.com
10 alt4.aspmx.l.google.com
TXT
MS=ms73710064
1|www.huggingface.co
apple-domain-verification=ZDO4wVjVjWMGBFP3
amazonses:haWTX74o8Xzj4/OOGCiZvCKU2CreCZ9D+2OemeBCWW0=
openai-domain-verification=dv-e4Lrj3WKW6Ij50099jy0UDHH
miro-verification=ffff67f600b7fa1bc0e2cfeb85506a9854d04b3f
mongodb-site-verification=pJyVDE1qFtWfLWussktn17TxGmMiOSrO
cursor-domain-verification-e2jjpz=VS6jJT0Yi3HOWOAjVnPRBRn4R
seatsurfing-verification=c972dd30-8319-4f60-b684-089c02e1e7bd
uber-domain-verification=a96220f2-0f5b-4858-b6ce-1525a1e5b3a5
anthropic-domain-verification-be2qx2=5duhSVDfBdfL9zp9HMwMo5DeF
plausible-sso-verification=71baae3e-8875-4d97-b492-3d0bcc09ab35
v=MCPv1; k=ed25519; p=EWH4AejXSbTWok3hjfTSRcFXFG/Qe+oQffs4nM/Hl7k=
google-site-verification=0xPvU1qdox33LAduAR6WZBcojgN2dTHbmD6V7xH86ao
google-site-verification=ZlzPJH9K6WW65-qtY2MAVZedKyBrjS2hX6B6Y6mlvxQ
google-site-verification=lyRnnTlQ38GAC7D92RqswXMuRY6G0pRaPMyfKtNK5zw
zapier-domain-verification-challenge=83bd16a2-804b-4046-8607-d0aed15cc172
stripe-verification=EB5A6D7C5DB936DB61416A17258106A0BE35C774B2E9532B040C5D5F6859...
hcp-domain-verification=b90e13b0828283c307c52de32fe6661bcd4da664d5486f0b552f4593...
amazon-business-verification=edce90d350ae97c05d07c252817db08ffe470096ef197b689ab...
SPF v=spf1 include:spf.mailjet.com include:_spf.google.com include:amazonses.com inc...
CAALookup not available with standard resolver
Resolved in 56 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://huggingface.co

https://huggingface.co

19 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://huggingface.co20019 msHTTP/1.1
A+
Crawlability
robots.txt present, sitemap with 7 URLs
PASS
robots.txt present, sitemap with 7 URLs
Info::
robots.txt is present
Got: 68 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 7 entries
Info::
Sitemap index with 7 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 68 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
User-agent: *
Allow: /

Sitemap: https://huggingface.co/sitemap.xml
sitemap.xml 200 OK
Type Sitemap Index URLs 7 entries Valid XML Yes
Child Sitemaps:
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

302https://www.huggingface.co/
200https://huggingface.co/

Preferred variant: non-www

HTTP → HTTPS

301http://huggingface.co/ → https://huggingface.co/

Consistent

A+
Domain Intelligence
huggingface.co — via OVH sas, 9 years, 10 months old, hosted on AWS
PASS
huggingface.co — via OVH sas, 9 years, 10 months old, hosted on AWS
Info::
Domain registered until Jul 17, 2026 (3 months remaining)
Info::
Registrar: OVH sas
Info::
Hosting: AWS
Got: AS16509
Domain expiry

32 days

July 17, 2026

SSL certificate

173 days

Issued by Amazon

Domain age

9 years, 10 months

Registered July 18, 2016

DNSSEC

Status unknown

Protects against DNS spoofing

Hosting

AWS

ASN AS16509

108.138.246.71

Registrar

OVH sas

Lock status unknown 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
Registrar OVH sas
Created July 18, 2016 (9 years, 10 months ago)
Expires July 17, 2026 (3 months)
Last Updated July 6, 2025
Name Servers ns-919.awsdns-50.net, ns-1452.awsdns-53.org, ns-137.awsdns-17.com, ns-1955.awsdns-52.co.uk
Hosting
IP Address 108.138.246.71
ASN AS16509 (AMAZON-02 - Amazon.com, Inc., US)
Provider AWS
Data source: whois (0.8s)
A+
HTTP Probe Timing
Total 18 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.
2 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
5 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
17 ms
Total Time Total request time from DNS lookup through full response.
18 ms

Connection waterfall

DNS Lookup 5 ms TCP Connect 2 ms TLS Handshake 5 ms Server Processing 5 ms Content Transfer 1 ms
A+
CDN & Delivery
AWS CloudFront (Hit from cloudfront)
PASS
AWS CloudFront (Hit from cloudfront)
Info::
Site is served via AWS CloudFront CDN (edge: SFO53-P4)
Got: x-amz-cf-id: G2cu4vmvdeqVXh4sQLH8iPPH5ivOq3BCq6k9HHyS85vUUdjZqWMGbw==
Info::
CDN cache status: Hit from cloudfront
CDN Detected: AWS CloudFront
Provider AWS CloudFront Cache Status Hit from cloudfront Evidence x-amz-cf-id: G2cu4vmvdeqVXh4sQLH8iPPH5ivOq3BCq6k9HHyS85vUUdjZqWMGbw==
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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