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Total

DNS

Email

Security

Network

100

Availability

Domainloc.gov

IPv42

IPv62

MX records2

StatusActive

Domain technical report

Home | Library of Congress

loc.gov

The world's largest library. View historic photos, maps, books and more. Contact experts for help with research. Plan a visit. Home of U.S. Copyright Office.

Generated: 2026-08-08T17:31:02-05:00 · Cached result

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IPv42

IPv62

MX2

NS2

DiagnosticsMain findings and recommendations

✓

IPv4 (A)30 / 30 pts · Dns

2 IPv4 address(es) detected.

✓

IPv6 (AAAA)10 / 10 pts · Dns

2 IPv6 address(es) detected.

✓

Name server redundancy20 / 20 pts · Dns

2 NS record(s); 2 or more required.

✓

SOA record10 / 10 pts · Dns

Authoritative zone record.

✓

DNSSEC chain15 / 15 pts · Dns

DS and DNSKEY detected.

CAA policy0 / 5 pts · Dns

Certificate authority restriction.

✓

DNS propagation10 / 10 pts · Dns

Agreement between public resolvers.

✓

MX records20 / 20 pts · Mail

2 MX record(s).

✓

SPF25 / 25 pts · Mail

SPF policy published.

✓

DMARC25 / 25 pts · Mail

DMARC policy published.

DKIM0 / 20 pts · Mail

No tested DKIM selector responded.

MTA-STS0 / 5 pts · Mail

Mail transport policy.

TLS-RPT0 / 5 pts · Mail

TLS reporting policy.

✓

Valid TLS certificate55 / 55 pts · Security

75 day(s) remaining.

✓

Certificate lifetime10 / 10 pts · Security

Full points require at least 30 days remaining.

HTTP security headers19 / 35 pts · Security

5 of 9 evaluated headers detected.

PTR reverse DNS0 / 30 pts · Network

PTR not detected.

✓

IPv4 diversity35 / 35 pts · Network

Two or more IPv4 addresses receive full points.

✓

IPv6 connectivity35 / 35 pts · Network

AAAA availability.

✓

DNS resolution40 / 40 pts · Availability

At least one address family must resolve.

✓

HTTP response40 / 40 pts · Availability

HTTP/2 200

✓

HTTPS final URL20 / 20 pts · Availability

Final URL uses HTTPS.

DNS and emailPublished records and email configuration

A

2 record(s)

104.18.64.82
104.17.6.58

AAAA

2 record(s)

2606:4700::6811:63a
2606:4700::6812:4052

CNAME

0 record(s)

—

Not configured

MX

2 record(s)

10 mxb-00026101.gslb.gpphosted.com.
10 mxa-00026101.gslb.gpphosted.com.

TXT

12 record(s)

"webexdomainverification.NQCL=b1bef083-e011-4dcf-b1f7-42204b82128e"
"ZA=NzrYbQCQ4geLYL//TYHmJA=="
"google-site-verification=D5cqNFQ7z5rT2z4OXeYRmxrMc80omDUqEGtsNFY9N_g"
"538fe1481176c669d55eb1a37227bd0a3ccfb28d6a2838429e59f504dc3070d3"
"MS=ms90737861"
"yTrNm8yrlLjz94UZ1A2UUPz7Gv5UfCIypoGH1HmXjNs="
"62QSYa/kfNXdxXnLjT9/ZOyvqed/KSL3dFy+b7K7EFS08xeEY8vGX0IT9BCOCvkgLa16BcrmaQhTgKeOMK6njA=="
"v=spf1 include:spf1.loc.gov include:spf2.loc.gov include:spf-00026101.gpphosted.com mx -all"
"google-site-verification=o0tsBc2NuJSImRS3MromAcC8lwoaWNp5LFZlmJXB0-0"
"adobe-idp-site-verification=02f02861-90f5-4cf5-9922-c67c80a7bf26"
"e9af54f5-6e02-4c11-84a3-ab9d25e7b454"
"atlassian-domain-verification=nWInaz9qwixZxg4Ef5K7jmsSKDAlta15azD9kOFROWwn8xjciPtK3MK4SUFB1R1/"

NS

2 record(s)

alice.ns.cloudflare.com.
kevin.ns.cloudflare.com.

SOA

1 record(s)

alice.ns.cloudflare.com. dns.cloudflare.com. 2411593402 10000 2400 604800 1800

CAA

0 record(s)

—

Not configured

DS

1 record(s)

2371 13 2 C975D3D3F2857C9EFB6D1F5313B06528E1FE8908CAB6E82C5C02C462 875BF27E

DNSKEY

2 record(s)

256 3 13 oJMRESz5E4gYzS/q6XDrvU1qMPYIjCWzJaOau8XNEZeqCYKD5ar0IRd8 KqXXFJkqmVfRvMGPmM1x8fGAa2XhSA==
257 3 13 mdsswUyr3DPW132mOi8V9xESWE8jTo0dxCjjnopKl+GqJxpVXckHAeF+ KkxLbxILfDLUT0rAK9iUzy1L53eKGQ==

RRSIG

6 record(s)

DNSKEY 13 2 3600 20260928200705 20260729200705 2371 loc.gov. lOCt3yP0VjkTdU3xGsfWmyO34th8YxXhm/p0X+AePQ4oTwZ55FwEwj3J DhHmUkDLAHzNOT2FtSLgcOpuZbQIxA==
NS 13 2 86400 20260809233050 20260807213050 34505 loc.gov. 2WBlB4H7ur2ctC7qLYqcbQYNNfmA0UvwFO/o6yRn6MQyywMTYnmBnYZd b8hkleOE1C1cvlUSB9QgZsLcSIOSWg==
MX 13 2 300 20260809233050 20260807213050 34505 loc.gov. s77GP32J6DL/rmLGGtRPpJzUVRxpyUf/crV3o+xkUd6paTBkdPZYrPTE BBKKc9CaAA/nOYtoZDozXkLlc2bB6Q==
AAAA 13 2 300 20260809233050 20260807213050 34505 loc.gov. nVY0nJgGMTr3+ZlE0750HAWibgaX2rW+tfKesx58AxgvkzcoYNL6XyMG 56bU5BTrAbwv6Fy/5+5OEHsf/t1KBQ==
A 13 2 300 20260809233050 20260807213050 34505 loc.gov. j4Uwh/XB7AFOrn17w3jlld6z3+iIomyNcQmnYoccZckos/ujpuwX54VR NDgqHU4aKacFM64iU239NF72kyh4mA==
DS 13 2 3600 20260809233050 20260807213050 35496 gov. U9U3zZ9+zF3Fi62k4PNw43KnpN42DkDqalxwfY52HXMRtj++qsCbeeLI v9w110Y8pUiXUJBtes2zuVH4rrmUww==

NSEC

1 record(s)

\000.loc.gov. A NS SOA PTR HINFO MX TXT AAAA LOC SRV NAPTR CERT SSHFP RRSIG NSEC DNSKEY TLSA SMIMEA HIP CDS CDNSKEY OPENPGPKEY SVCB HTTPS URI CAA

NSEC3

0 record(s)

—

Not configured

SRV

0 record(s)

—

Not configured

NAPTR

0 record(s)

—

Not configured

TLSA

0 record(s)

—

Not configured

SSHFP

0 record(s)

—

Not configured

SPF

Configured

v=spf1 include:spf1.loc.gov include:spf2.loc.gov include:spf-00026101.gpphosted.com mx -all

DMARC

Configured

v=DMARC1;p=none;sp=none;fo=1;rua=mailto:locdmarc_reports@loc.gov;ruf=mailto:locdmarc_ruf@loc.gov;rf=afrf;pct=100

DKIM

Not found

—

Not configured

Analyzed webpageMetadata and HTTP response

Title and description

Extracted

Title

Home | Library of Congress

Description

The world's largest library. View historic photos, maps, books and more. Contact experts for help with research. Plan a visit. Home of U.S. Copyright Office.

Final URL

https://www.loc.gov/

HTTP status

206

HTTP

Status

HTTP/2 200

Final URL

https://www.loc.gov/

Version

Server

cloudflare

X-Powered-By

SSL and HTTP securityCertificate, protocol and security headers

SSL certificate

Available

Yes

Issuer

Let's Encrypt

loc.gov

Valid from

2026-07-25T07:21:02-05:00

Valid until

2026-10-23T07:21:01-05:00

Days remaining

Protocol

TLSv1.3

Cipher

TLS_AES_256_GCM_SHA384

Security headers

5 active

✓

HSTSImplemented

✓

Content Security PolicyImplemented

✓

X-Content-Type-OptionsImplemented

✓

X-Frame-OptionsImplemented

✓

Referrer PolicyImplemented

—

Permissions PolicyNot detected

—

Cross-Origin-Opener-PolicyNot detected

—

Cross-Origin-Embedder-PolicyNot detected

—

Cross-Origin-Resource-PolicyNot detected

DNS propagationComparison across public resolvers

Public resolver comparison

Consistent

✓

Consistent propagation

5 public resolvers queried.

ResolverServerResultLatency

Google

8.8.8.8

104.17.6.58, 104.18.64.82

75,42 ms

Cloudflare

1.1.1.1

104.17.6.58, 104.18.64.82

46,14 ms

Quad9

9.9.9.9

104.17.6.58, 104.18.64.82

52,45 ms

OpenDNS

208.67.222.222

104.17.6.58, 104.18.64.82

58,28 ms

AdGuard

94.140.14.14

104.17.6.58, 104.18.64.82

50,29 ms

IP, geolocation and ASNAssociated network information

104.18.64.82

No data

success

country

region

city

asn

organization

isp

104.17.6.58

No data

success

country

region

city

asn

organization

isp

Visitor information

Visitor

216.73.217.62

reverse

country

country_code

region

city

latitude

longitude

isp

organization

asn

timezone

browser

Other

language

user_agent

Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)

is_bot

Yes

cloudflare

SMTPEmail port connectivity

mxb-00026101.gslb.gpphosted.com

Port 25: Closed/unreachable - 28.6 ms - 
Port 465: Closed/unreachable - 4062.7 ms - 
Port 587: Closed/unreachable - 4008.4 ms -

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