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https://hackerone.com

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
82
GRADE
B
FIX
1
REVIEW
2
PASS
6
INFO
0
Probed from Santa Clara, United States
302 Found
Checks
9
6 PASS 2 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: 2606:4700:440a::6812:24d6, 2a06:98c1:3106::ac40:972a
Info::
IPv6 connection error
Got: dial tcp6 [2606:4700:440a::6812:24d6]:443: connect: network is unreachable
IPv6 Misconfigured
AAAA Records 2606:4700:440a::6812:24d6, 2a06:98c1:3106::ac40:972a 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
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.hackerone.com/
200https://hackerone.com/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://hackerone.com/ → https://hackerone.com/

Consistent

B
TLS Certificate Expiry & Recommendations
334 days until leaf cert expires — 2 issues to address
REVIEW

Certificate validity

334
days left
0d 30d 60d 90d+

Recommended actions

  • Submit your domain to hstspreload.org to be added to the Chrome preload list
  • Enable OCSP stapling on your TLS server to remove a CA roundtrip and protect user privacy
A+
DNS Records
2 A records, 19 ms lookup
PASS
2 A records, 19 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 172.64.151.42, 104.18.36.214
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2606:4700:440a::6812:24d6, 2a06:98c1:3106::ac40:972a
Info::
2 nameserver(s) configured
Got: a.ns.hackerone.com, b.ns.hackerone.com
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: 19 ms
Got: 19 ms
A172.64.151.42, 104.18.36.214
AAAA2606:4700:440a::6812:24d6, 2a06:98c1:3106::ac40:972a
CNAME—
NSa.ns.hackerone.com, b.ns.hackerone.com
MX
10 aspmx.l.google.com
20 alt2.aspmx.l.google.com
20 alt1.aspmx.l.google.com
30 aspmx2.googlemail.com
30 aspmx3.googlemail.com
TXT
MS=ms75772789
0q8zpfvc64swgyy9wwwrjl7vgwrfffbf
4b7570f2564f4074b42872e1d78668ad
70gn9hp69jzpn3nkp42r8n9jwwtd1d70
_56ra2mupvxu61g49yhns1uxv031fxcy
_muuhv6zkwwnyy8b6x1ei4m8hrtsm17g
c06l6z7hp4vk6bzpqb1j6b8w1m64nf84
ZOOM_verify_pzZpSwKqRx6pAD9lLkSl5g
wayback=verification for request #673161
wework-site-verification=e0czKzmn7ul5Cr9A
apple-domain-verification=YOO9EuQfVRiqtbWi
docusign=848c7864-3a91-42aa-8e30-2671086f7516
canva-site-verification=RY1pq8pQpGqV1RdvvgatQA
openai-domain-verification=dv-8UsaxQU6vJQfWNS8d3FBK4et
jetbrains-domain-verification=69ifho5wgkblhail93kc83elv
cloudpiercer-verification=32e7eea9d2f153b176b182626588bc77
facebook-domain-verification=niq4ke9m7djq4jt36f02t093aig8a5
citrix-verification-code=9c920630-2d05-4154-b72a-1021665d3b58
onetrust-domain-verification=0be23834ba1d435eb1748ba6b36d8b0c
protonmail-verification=f3b0af7c5614dbdf82c5bdebc6014593c05b92f6
slack-domain-verification=cQndsOjWj4XDM9icHSNlvtrh3r1jfQMQTfhDNxiz
monday-com-verification=uj2Ko666o6C_Gc_vbCiQ6n7ruARZpX0U3I0bocalW60
google-site-verification=3LAOq3Z_u6zVOJHlZW0I7tuQpCPvZHC9JBZMk3e20mk
google-site-verification=iKe1wvhRzxTmexGrBcrDplrCvBL-PL2Mgf4VZQAfYNs
google-site-verification=kOO_QjqFZ7fbwXaF0PiMcK2OMQL5nTVBiM21SsO9Olk
google-site-verification=mKdqQzjtY7X20BzUFnhAmFU2pmtFJ_Zie_S22FiwubA
clayton-domain-verification=d21920d13f0a60c931f46d440f6c87526f656b0377
h1-domain-verification=LDEQA8SYNEMgdUN1kfMtjFNptDJcnjKN8LxNHCN3JNvT5Fxo
zapier-domain-verification-challenge=d1be5c1b-f415-418f-9542-abc14d8321af
stripe-verification=20c821f6e4dfc5ee358ea9b8e4635cf062a2acac5751f8004d23b122f1cb...
stripe-verification=74802599834dfbfc093c8352686c992d22e7b20a6fdcfceac2e6a846074d...
box-domain-verification=8b89b955ef91d29f746acc1a7147aa9490922028fcf458e98b62aa76...
drift-domain-verification=18fef5450d713c159ad9f6309fa338d298c11edd56fb22e343d758...
adobe-idp-site-verification=5d77b0274800290cf193145126595b14308358f46dfe90eba5e2...
atlassian-domain-verification=JpJ4g3munTo9KsuR3Elcdpn97c+KQV7KDjj2YmE+ULiWhGlcfA...
ethiack-verification=efd57ccd9a94d6363d89e0a992e872c6ff651a41d1091228978021da750...
SPF v=spf1 include:_spf.google.com include:amazonses.com include:mail.zendesk.com in...
CAALookup not available with standard resolver
Resolved in 19 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
1 redirect(s), 131 ms total
PASS
1 redirect(s), 131 ms total
Info::
Single redirect
Got: https://hackerone.com → https://www.hackerone.com/ (302)
Info::
WWW normalization redirect
Info::
Uses 302 (temporary) redirect
If permanent, use 301 instead.
Got: https://hackerone.com

https://hackerone.com

82 ms · HTTP/1.1

302

https://www.hackerone.com/

49 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://hackerone.com30282 msHTTP/1.1cloudflare
2https://www.hackerone.com/20049 msHTTP/1.1cloudflare

See the visual redirect chain in the HTTP Probe tab →

If permanent, use 301 instead.

Why this matters

302 (Found) is for genuinely temporary redirects — if this redirect is permanent, switch to 301 to preserve SEO equity.

Learn more ▾

Search engines treat 302 as temporary, keeping the original URL indexed and not transferring full link equity to the destination. Use 301 (Moved Permanently) for permanent redirects (HTTP→HTTPS, www-vs-non-www, URL restructures).

Source: Google Search Central

A+
Crawlability
robots.txt present, sitemap with 38 URLs
PASS
robots.txt present, sitemap with 38 URLs
Info::
robots.txt is present
Got: 43 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 38 entries
Info::
Sitemap index with 38 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 43 B Sitemaps referenced 1 User-agents Blocking No — crawling allowed
Sitemap: https://hackerone.com/sitemap.xml
sitemap.xml 200 OK
Type Sitemap Index URLs 38 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
hackerone.com — via Cloudflare, Inc., 18 years, 8 months old, hosted on Cloudflare
PASS
hackerone.com — via Cloudflare, Inc., 18 years, 8 months old, hosted on Cloudflare
Info::
Domain registered until Nov 26, 2026 (7 months remaining)
Info::
DNSSEC is enabled
Info::
Registrar: Cloudflare, 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: Cloudflare
Got: AS13335
Domain expiry

133 days

November 26, 2026

SSL certificate

334 days

Issued by DigiCert Inc

Domain age

18 years, 8 months

Registered November 26, 2007

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

Cloudflare

ASN AS13335

104.18.36.214

Registrar

Cloudflare, 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 Cloudflare, Inc.
Created November 26, 2007 (18 years, 8 months ago)
Expires November 26, 2026 (7 months)
Last Updated August 29, 2025
Name Servers a.ns.hackerone.com, b.ns.hackerone.com
DNSSEC Enabled
Hosting
IP Address 104.18.36.214
ASN AS13335 (CLOUDFLARENET - Cloudflare, Inc., US)
Provider Cloudflare
Data source: rdap (0.1s)

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 82 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.
13 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
83 ms
Total Time Total request time from DNS lookup through full response.
83 ms

Connection waterfall

DNS Lookup 5 ms TCP Connect 2 ms TLS Handshake 13 ms Server Processing 62 ms Content Transfer 0 ms
A
CDN & Delivery
Cloudflare (DYNAMIC)
PASS
Cloudflare (DYNAMIC)
Info::
Site is served via Cloudflare CDN (edge: SJC)
Got: cf-ray: 9f077a509ad6f0af-SJC
Info::
CDN cache status: DYNAMIC
CDN Detected: Cloudflare
Provider Cloudflare Cache Status DYNAMIC Evidence cf-ray: 9f077a509ad6f0af-SJC
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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