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https://irs.gov

Infrastructure

· 9 checks — DNS, redirects, IPv6, crawlability, URL variants, and domain intelligence rolled into one auditable list.
SCORE
79
GRADE
C
FIX
2
REVIEW
4
PASS
3
INFO
0
Probed from Madrid, Spain
301 Moved Permanently
Checks
9
3 PASS 4 REVIEW 2 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: 2610:30:4000:402::110, 2610:30:2000:402::110
Info::
IPv6 connection error
Got: dial tcp6 [2610:30:4000:402::110]:443: i/o timeout
IPv6 Misconfigured
AAAA Records 2610:30:4000:402::110, 2610:30:2000:402::110 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)

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
Redirect Chain
1 redirect(s), 1370 ms total
REVIEW
1 redirect(s), 1370 ms total
Info::
Single redirect
Got: https://irs.gov → https://www.irs.gov/ (301)
Info::
WWW normalization redirect
Warning::
Redirect overhead: 1370 ms total
Got: 1370 ms

https://irs.gov

1032 ms · HTTP/1.0

301

https://www.irs.gov/

338 ms · HTTP/1.1 FINAL

#URLStatusTimeProtocolServer
1https://irs.gov3011032 msHTTP/1.0BigIP
2https://www.irs.gov/200338 msHTTP/1.1

See the visual redirect chain in the HTTP Probe tab →

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.irs.gov/
200https://irs.gov/

Inconsistent — duplicate content risk

HTTP → HTTPS

301http://irs.gov/ → https://irs.gov/

Consistent

B
HTTP Probe Timing
Total 1181 ms — DNS, TCP, TLS, TTFB, content transfer breakdown
REVIEW
DNS Lookup DNS Lookup — time to resolve the domain name to an IP address.
31 ms
TCP Connect TCP Connect — time to establish a TCP connection to the server.
123 ms
TLS Handshake TLS Handshake — time to complete the HTTPS encryption handshake.
904 ms
Time to First Byte Time to First Byte — how long the server takes to respond with the first byte of data.
1.18 s
Total Time Total request time from DNS lookup through full response.
1.18 s

Connection waterfall

DNS Lookup 31 ms TCP Connect 123 ms TLS Handshake 904 ms Server Processing 123 ms Content Transfer 0 ms
B
TLS Certificate Expiry & Recommendations
124 days until leaf cert expires — 4 issues to address
REVIEW

Certificate validity

124
days left
0d 30d 60d 90d+

Recommended actions

  • Prefer TLS 1.3 — TLS 1.2 is acceptable but TLS 1.3 removes RSA key exchange and improves latency
  • 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
2 A records, 34 ms lookup
PASS
2 A records, 34 ms lookup
Info::
Resolves to 2 IPv4 address(es)
Got: 152.216.11.110, 152.216.7.110
Info::
Has 2 IPv6 (AAAA) record(s)
Got: 2610:30:4000:402::110, 2610:30:2000:402::110
Info::
2 nameserver(s) configured
Got: ns0022.secondary.cloudflare.com, ns0227.secondary.cloudflare.com
Info::
3 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: 34 ms
Got: 34 ms
A152.216.11.110, 152.216.7.110
AAAA2610:30:4000:402::110, 2610:30:2000:402::110
CNAME—
NSns0022.secondary.cloudflare.com, ns0227.secondary.cloudflare.com
MX
10 emgc.irs.gov
10 emge.irs.gov
20 emgw.irs.gov
TXT
SPF v=spf1 ip4:152.216.0.0/20 ip6:2610:30::/32 -all
google-site-verification=GsJzgbUY39iE6wPNlPdZCPGWwyhYpWwxpVxaU8g-Aa4
CAALookup not available with standard resolver
Resolved in 34 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+
Crawlability
robots.txt present, sitemap with 12 URLs
PASS
robots.txt present, sitemap with 12 URLs
Info::
robots.txt is present
Got: 2257 bytes
Info::
sitemap.xml is present
Info::
sitemap.xml is valid XML
Info::
sitemap.xml contains 12 entries
Info::
Sitemap index with 12 child sitemaps
Info::
robots.txt references sitemap
robots.txt 200 OK
Size 2257 B Sitemaps referenced 1 User-agents * Blocking No — crawling allowed
#

# robots.txt

#

# This file is to prevent the crawling and indexing of certain parts

# of your site by web crawlers and spiders run by sites like Yahoo!

# and Google. By telling these "robots" where not to go on your site,

# you save bandwidth and server resources.

#

# This file will be ignored unless it is at the root of your host:

# Used:    http://example.com/robots.txt

# Ignored: http://example.com/site/robots.txt

#

# For more information about the robots.txt standard, see:

# http://www.robotstxt.org/robotstxt.html

Sitemap: https://www.irs.gov/sitemap.xml


User-agent: *

# CSS, JS, Images

Allow: /core/*.css$

Allow: /core/*.css?

Allow: /core/*.js$

Allow: /core/*.js?

Allow: /core/*.gif

Allow: /core/*.jpg

Allow: /core/*.jpeg

Allow: /core/*.png

Allow: /core/*.svg

Allow: /profiles/*.css$

Allow: /profiles/*.css?

Allow: /profiles/*.js$

Allow: /profiles/*.js?

Allow: /profiles/*.gif

Allow: /profiles/*.jpg

Allow: /profiles/*.jpeg

Allow: /profiles/*.png

Allow: /profiles/*.svg

# Directories

Disallow: /core/

Disallow: /profiles/

# Files

Disallow: /README.txt

Disallow: /web.config

# Paths (clean URLs)

Disallow: /admin/

Disallow: /comment/reply/

Disallow: /filter/tips

Disallow: /node/add/

Disallow: /search/

Disallow: /*search=*

Disallow: /user/register/

Disallow: /user/password/

Disallow: /user/login/

Disallow: /user/logout/

Disallow: /zh-hans/node/

Disallow: /zh-hant/node/

Disallow: /es/node/

Disallow: /vi/node/

Disallow: /ht/node/

Disallow: /ru/node/

Disallow: /ko/node/

# Paths (no clean URLs)

Disallow: /index.php/zh-hans/node/

Disallow: /index.php/zh-hant/node/

Disallow: /index.php/es/node/

Disallow: /index.php/vi/node/

Disallow: /index.php/ht/node/

Disallow: /index.php/ru/node/

Disallow: /index.php/ko/node/

Disallow: /index.php/admin/

Disallow: /index.php/comment/reply/

Disallow: /index.php/filter/tips

Disallow: /index.php/node/add/

Disallow: /index.php/search/

Disallow: /index.php/user/password/

Disallow: /index.php/user/register/

Disallow: /index.php/user/login/

Disallow: /index.php/user/logout/

Disallow: /filing/free-file-fillable-forms/free-file-fillable-forms-support

Disallow: /filing/free-file-fillable-forms/free-file-fillable-forms-support-2
sitemap.xml 200 OK
Type Sitemap Index URLs 12 entries Valid XML Yes
Child Sitemaps:
A+
Domain Intelligence
irs.gov — via get.gov, 28 years, 11 months old
PASS
irs.gov — via get.gov, 28 years, 11 months old
Info::
Domain registered until Aug 4, 2026 (3 months remaining)
Info::
DNSSEC is enabled
Info::
Registrar: get.gov
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

22 days

August 4, 2026

SSL certificate

124 days

Issued by Entrust Limited

Domain age

28 years, 11 months

Registered October 2, 1997

DNSSEC

Enabled

Protects against DNS spoofing

Hosting

Unknown

2610:30:4000:402::110

Registrar

get.gov

Unlocked 2 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 registrar lock (clientTransferProhibited) to block unauthorized domain transfers
Registrar get.gov
Created October 2, 1997 (28 years, 11 months ago)
Expires August 4, 2026 (3 months)
Last Updated August 9, 2025
Name Servers ns0022.secondary.cloudflare.com, ns0227.secondary.cloudflare.com
DNSSEC Enabled
Registrant REDACTED FOR PRIVACY
Hosting
IP Address 2610:30:4000:402::110
Data source: rdap (1.5s)

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

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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