`loc.gov`

DNSSEC	🔒 Signed (DS record present)
A	2606:4700::6811:63a^{🇺🇸 Cloudflare2606:4700::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	2606:4700::6812:4052^{🇺🇸 Cloudflare2606:4700::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.17.6.58^{Cloudflare104.17.0.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
A	104.18.64.82^{Cloudflare104.18.64.0/20 , Inc. 101 Townsend Street, San Francisco, California 94107, US} ✓ In HTTPS hints
NS	`alice.ns.cloudflare.com` ⭐
		A	2606:4700:50::adf5:3a3c^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`alice.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c03c^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`alice.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:203c^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`alice.ns.cloudflare.com`
		A	108.162.192.60^{🇺🇸 Cloudflare108.162.192.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`alice.ns.cloudflare.com`
		A	172.64.32.60^{🇺🇸 Cloudflare172.64.32.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`alice.ns.cloudflare.com`
		A	173.245.58.60^{🇺🇸 Cloudflare173.245.58.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`alice.ns.cloudflare.com`
NS	`kevin.ns.cloudflare.com`
		A	2606:4700:58::adf5:3bbf^{🇺🇸 Cloudflare2606:4700:50::/44 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`kevin.ns.cloudflare.com`
		A	2803:f800:50::6ca2:c1bf^{🇨🇷 Cloudflare2803:f800:50::/45 LACNIC generated route6 for CloudFlare Latin America S.R.L}
			PTR	`kevin.ns.cloudflare.com`
		A	2a06:98c1:50::ac40:21bf^{🇺🇸 Cloudflare2a06:98c1:50::/45}
			PTR	`kevin.ns.cloudflare.com`
		A	108.162.193.191^{🇺🇸 Cloudflare108.162.193.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`kevin.ns.cloudflare.com`
		A	172.64.33.191^{🇺🇸 Cloudflare172.64.33.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`kevin.ns.cloudflare.com`
		A	173.245.59.191^{🇺🇸 Cloudflare173.245.59.0/24 , Inc. 101 Townsend Street, San Francisco, California 94107, US}
			PTR	`kevin.ns.cloudflare.com`
MX	`mxa-00026101.gslb.gpphosted.com` ⭐
		A	66.159.228.43^{🇺🇸 Proofpoint66.159.228.0/24 Inc.}
			PTR	`mx0f-00026101.gpphosted.com`
MX	`mxb-00026101.gslb.gpphosted.com` ⭐
		A	66.159.227.43^{🇺🇸 Proofpoint66.159.227.0/24 Inc.}
			PTR	`mx0e-00026101.gpphosted.com`
TXT	`538fe1481176c669d55eb1a37227bd0a3ccfb28d6a2838429e59f504dc3070d3`
TXT	`62QSYa/kfNXdxXnLjT9/ZOyvqed/KSL3dFy+b7K7EFS08xeEY8vGX0IT9BCOCvkgLa16BcrmaQhTg...`
TXT	`MS=ms90737861`
TXT	`ZA=NzrYbQCQ4geLYL//TYHmJA==`
TXT	`adobe-idp-site-verification=02f02861-90f5-4cf5-9922-c67c80a7bf26`
TXT	`f05abc6d-1dc0-451c-91ba-e65ef91027a5`
TXT	`google-site-verification=D5cqNFQ7z5rT2z4OXeYRmxrMc80omDUqEGtsNFY9N_g`
TXT	`google-site-verification=o0tsBc2NuJSImRS3MromAcC8lwoaWNp5LFZlmJXB0-0`
TXT	`v=spf1 include:spf1.loc.gov include:spf2.loc.gov include:spf-00026101.gpphost...`
TXT	`webexdomainverification.NQCL=b1bef083-e011-4dcf-b1f7-42204b82128e`
TXT	`yTrNm8yrlLjz94UZ1A2UUPz7Gv5UfCIypoGH1HmXjNs=`
HTTPS	HTTP/2 ✓ hints match
		IPv4	104.17.6.58, 104.18.64.82
		IPv6	2606:4700::6811:63a, 2606:4700::6812:4052
SOA	`alice.ns.cloudflare.com`dns@cloudflare.com serial=2398557742

`gov`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.ns.gov` ⭐
	NS	`b.ns.gov`
	NS	`c.ns.gov`
	NS	`d.ns.gov`
	SOA	`a.ns.gov`dns@cloudflare.com serial=1773273316

rank #190 globally
rank #6 in the tld
This domain name "loc.gov" refers to the official website of the Library of Congress, which is the largest library in the world, with millions of books, recordings, photographs, maps and manuscripts in its collections. The Library of Congress is the main research arm of the U.S. Congress and the home of the U.S. Copyright Office.WOT: SAFE (94/100)
📈 Tranco rank: #578

Library of Congress

The Library of Congress is the largest library in the world and the oldest federal cultural institution in the United States, founded in 1800. It serves as the research arm of the U.S. Congress and is the de facto national library, housing over 170 million items including books, manuscripts, photographs, maps, audio recordings, and films.

Key Services

Digital Collections — Millions of digitized items freely accessible online, including historical photographs, maps, audio recordings, and manuscripts
Congress.gov — Official tracking of U.S. federal legislation and congressional activities
Research Centers — Specialized reading rooms and "Ask a Librarian" consultation services
National Film Registry — Preservation of culturally significant American films
Educational Programs — Resources for teachers, students, and researchers

Infrastructure

Type	Details
CDN/DNS	Cloudflare (alice.ns.cloudflare.com, kevin.ns.cloudflare.com)
IPv4	104.17.6.58, 104.18.64.82
IPv6	2606:4700::6811:63a, 2606:4700::6812:4052
Mail Servers	mx22.loc.gov, mx41.loc.gov, mx42.loc.gov (140.147.x.x range)
Security	DNSSEC enabled with signed DS record
Ranking	~#194 globally, #6 within .gov TLD

Subdomains

ftp.loc.gov

pws1b.loc.gov

bard.loc.gov

stream-media.loc.gov

ipp24.loc.gov

esg1a.loc.gov

rs5.loc.gov

webarchive.loc.gov

rs7b.loc.gov

iwss1.loc.gov

rs7.loc.gov

sun8.loc.gov

pcn.loc.gov

lcweb.loc.gov

cords.loc.gov

dev-test-cords.loc.gov

rs6.loc.gov

learning.loc.gov

eresources.loc.gov

mwa1.loc.gov

desktop.loc.gov

id.loc.gov

authorities.loc.gov

www.loc.gov

crs-ad.loc.gov

rs11.loc.gov

blogs.loc.gov

rs15.loc.gov

mail.loc.gov

dell12.loc.gov

webmail.loc.gov

z3950.loc.gov

sun10.loc.gov

cmon.loc.gov

nm2.loc.gov

lb-loc-gov-misc-vip-prod.loc.gov

ns21.loc.gov

crowd.loc.gov

sslvpn3.loc.gov

rs3.loc.gov

pwscrs1a.loc.gov

rs9.loc.gov

labs.loc.gov

webdmep.loc.gov

cip.loc.gov

lcweb2.loc.gov

media.loc.gov

pws1a.loc.gov

ns10.loc.gov

catvlp01.loc.gov

oraserve.loc.gov

sslvpn1.loc.gov

smon.loc.gov

sun4.loc.gov

ndx01blp.loc.gov

ilsweb.loc.gov

cocatalog.loc.gov

mx23.loc.gov

sun9.loc.gov

test-cords.loc.gov

lx2.loc.gov

esg1b.loc.gov

dell7.loc.gov

thomas.loc.gov

hdl.loc.gov

guides.loc.gov

memory.loc.gov

lccn.loc.gov

ntlink.loc.gov

lx11.loc.gov

owa.loc.gov

tile.loc.gov

frontiers.loc.gov

rs16.loc.gov

lcfcumail2.loc.gov

catalog.loc.gov

ns5.loc.gov

ilssv3.loc.gov

ns23.loc.gov

crs.loc.gov

owa-ext.loc.gov

international.loc.gov

rs4.loc.gov

sslvpn4.loc.gov

mx42.loc.gov

mx22.loc.gov

pwscrs1b.loc.gov

sslvpn2.loc.gov

lcfcu3.loc.gov

notify2.loc.gov

chroniclingamerica.loc.gov

mx41.loc.gov

crsgw04.loc.gov

search.loc.gov

rs9b.loc.gov

iwss2.loc.gov

inqu2.loc.gov

nlsbard.loc.gov

crsdomain.loc.gov

catdir.loc.gov

lcweb4.loc.gov

ns4.loc.gov

Same first word

loc.pt

loc.info

loc.ie

loc.ca

loc.gov

loc.co.th

loc.pro

loc.church

loc.loans

loc.pl

loc.li

loc.nl

loc.com.mx

loc.al

loc.com

loc.st

loc.tw

loc.it

loc.lt

loc.me

loc.cl

loc.world

loc.dog

loc.net.vn

loc.us

loc.es

loc.co

loc.mx

loc.tv

loc.kz

loc.com.br

loc.edu

loc.uk.com

loc.ws

loc.lv

loc.to

loc.dk

loc.se

loc.at

loc.si

loc.dev

loc.be

loc.fr

loc.ch

loc.design

loc.net

loc.club

loc.kr

loc.com.au

loc.de

loc.med.br

loc.eu

loc.ski

loc.by

loc.cc

loc.top

loc.sh

loc.im

loc.ge

loc.cn

loc.ru

loc.is

loc.nu

loc.no

loc.wiki

Similar names

ocl.com.br

lco.ru

olc.org

col.azureedge.net

col.net.co

col.eu

lco.cz

olc.com.tw

ocl.ch

olc.community

clo.ru

ocl.info

lco.in

clo.com.uy

col.pt

ocl.no

col.com.my

olc.notaires.fr

clo.ee

lco.com.tw

ocl.be

olc.cc

ocl.jp

col.sk

olc.ru

ocl.co.in

col.co

olc.com.hk

ocl.edu.in

ocl.name

lco.info

col.ca

col.ie

ocl.ro

lco.mx

col.co.il

col.uk

col.us

olc.cz

lco.com.cn

ocl.com.sg

ocl.co.il

ocl.at

lco.cloud

col.es

clo.hu

lco.dk

col.co.ke

lco.org

col.com

olc.kr

clo.nyc

olc.net

lco.de

olc.co

clo.gr.jp

lco.me

olc.com.my

olc.co.in

lco.be

olc.co.uk

olc.edu

ocl.net.nz

lco.com.pl

col.org.cn

col.co.jp

clo.design

lco.global

lco.eu

ocl.is

olc.su

ocl.co.uk

lco.es

col.vg

clo.info

olc.kg

clo.com.ua

lco.io

col.ru

col.hu

col.lu

olc.ca

olc.no

col.be

ocl.com.au

olc.de

olc.co.jp

col.im

col.am

ocl.me

olc.tw

col.com.tr

clo.at

clo.nl

col.dog

olc.es

lco.cn

lco.co

clo.nu

lco.ro

col.co.th

olc.com

col.pw

clo.in

col.ac.uk

clo.mx

lco.com

ocl.se

lco.ca

ocl.org

ocl.fr

lco.bz

olc.red

col.bz

olc.cl

col.org.pe

col.k12.co.us

olc.vic.gov.au

olc.hu

clo.es

ocl.mobi

lco.org.tw

DNS History

34 records (8 active, 26 former)

●NSalice.ns.cloudflare.com2020-12-11 → 2026-03-13 · 3 obs

○ 2019-09-27 11:03:56
● 2020-12-11 18:57:04
● 2026-03-13 01:48:46

●NSkevin.ns.cloudflare.com2020-12-11 → 2026-03-13 · 3 obs

○ 2019-09-27 11:03:56
● 2020-12-11 18:57:04
● 2026-03-13 01:48:46

○NSns21.loc.gov2015-09-04 → 2019-09-27 · 5 obs

○ 2009-07-03 09:42:02
● 2015-09-04 08:43:20
● 2019-09-27 11:03:56
○ 2020-12-11 18:57:04
○ 2026-03-13 01:48:46

○NSns23.loc.gov2015-09-04 → 2019-09-27 · 5 obs

○ 2009-07-03 09:42:02
● 2015-09-04 08:43:20
● 2019-09-27 11:03:56
○ 2020-12-11 18:57:04
○ 2026-03-13 01:48:46

○NSns3.loc.gov2009-07-03 → 2009-07-03 · 3 obs

● 2009-07-03 09:42:02
○ 2015-09-04 08:43:20
○ 2026-03-13 01:48:46

○NSns4.loc.gov2009-07-03 → 2009-07-03 · 3 obs

● 2009-07-03 09:42:02
○ 2015-09-04 08:43:20
○ 2026-03-13 01:48:46

○NSrs1.loc.gov2009-07-03 → 2009-07-03 · 3 obs

● 2009-07-03 09:42:02
○ 2015-09-04 08:43:20
○ 2026-03-13 01:48:46

○MXc2bappps02.loc.gov2020-12-11 → 2020-12-11 · 4 obs

○ 2017-12-07 20:08:14
● 2020-12-11 18:57:04
○ 2021-06-11 19:45:26
○ 2026-03-13 01:48:46

○MXc2bappps03.loc.gov2020-12-11 → 2020-12-11 · 4 obs

○ 2017-12-07 20:08:14
● 2020-12-11 18:57:04
○ 2021-06-11 19:45:26
○ 2026-03-13 01:48:46

○MXmx22.loc.gov2021-06-11 → 2026-02-26 · 5 obs

○ 2020-12-11 18:57:04
● 2021-06-11 19:45:26
● 2026-02-26 04:24:40
○ 2026-02-26 22:09:56
○ 2026-03-13 01:48:46

○MXmx23.loc.gov2021-06-11 → 2021-06-11 · 4 obs

○ 2020-12-11 18:57:04
● 2021-06-11 19:45:26
○ 2026-02-15 01:36:08
○ 2026-03-13 01:48:46

○MXmx41.loc.gov2021-06-11 → 2026-02-26 · 5 obs

○ 2020-12-11 18:57:04
● 2021-06-11 19:45:26
● 2026-02-26 04:24:40
○ 2026-02-26 22:09:56
○ 2026-03-13 01:48:46

○MXmx42.loc.gov2021-06-11 → 2026-02-26 · 5 obs

○ 2020-12-11 18:57:04
● 2021-06-11 19:45:26
● 2026-02-26 04:24:40
○ 2026-02-26 22:09:56
○ 2026-03-13 01:48:46

●MXmxa-00026101.gslb.gpphosted.com2026-02-26 → 2026-03-13 · 3 obs

○ 2026-02-26 04:24:40
● 2026-02-26 22:09:56
● 2026-03-13 01:48:46

●MXmxb-00026101.gslb.gpphosted.com2026-02-26 → 2026-03-13 · 3 obs

○ 2026-02-26 04:24:40
● 2026-02-26 22:09:56
● 2026-03-13 01:48:46

○MXpps02a.loc.gov2015-10-26 → 2020-12-11 · 5 obs

○ 2009-07-03 09:42:02
● 2015-10-26 01:00:22
● 2020-12-11 18:57:04
○ 2021-06-11 19:45:26
○ 2026-03-13 01:48:46

○MXpps02b.loc.gov2015-10-26 → 2020-12-11 · 5 obs

○ 2009-07-03 09:42:02
● 2015-10-26 01:00:22
● 2020-12-11 18:57:04
○ 2021-06-11 19:45:26
○ 2026-03-13 01:48:46

○MXpps02c.loc.gov2015-10-26 → 2020-12-11 · 5 obs

○ 2009-07-03 09:42:02
● 2015-10-26 01:00:22
● 2020-12-11 18:57:04
○ 2021-06-11 19:45:26
○ 2026-03-13 01:48:46

○MXpps2.loc.gov2009-07-03 → 2017-11-01 · 4 obs

● 2009-07-03 09:42:02
● 2017-11-01 03:33:36
○ 2017-12-07 20:08:14
○ 2026-03-13 01:48:46

○MXpps2b.loc.gov2009-07-03 → 2017-11-01 · 4 obs

● 2009-07-03 09:42:02
● 2017-11-01 03:33:36
○ 2017-12-07 20:08:14
○ 2026-03-13 01:48:46

○A104.16.244.352016-07-27 → 2019-09-27 · 5 obs

○ 2016-07-18 08:46:42
● 2016-07-27 19:58:06
● 2019-09-27 11:03:56
○ 2020-12-11 18:57:04
○ 2026-03-13 01:48:46

○A104.16.245.352016-07-27 → 2019-09-27 · 5 obs

○ 2016-07-18 08:46:42
● 2016-07-27 19:58:06
● 2019-09-27 11:03:56
○ 2020-12-11 18:57:04
○ 2026-03-13 01:48:46

○A104.16.246.352016-07-27 → 2019-09-27 · 5 obs

○ 2016-07-18 08:46:42
● 2016-07-27 19:58:06
● 2019-09-27 11:03:56
○ 2020-12-11 18:57:04
○ 2026-03-13 01:48:46

○A104.16.247.352016-07-27 → 2019-09-27 · 5 obs

○ 2016-07-18 08:46:42
● 2016-07-27 19:58:06
● 2019-09-27 11:03:56
○ 2020-12-11 18:57:04
○ 2026-03-13 01:48:46

○A104.16.248.352016-07-27 → 2019-09-27 · 5 obs

○ 2016-07-18 08:46:42
● 2016-07-27 19:58:06
● 2019-09-27 11:03:56
○ 2020-12-11 18:57:04
○ 2026-03-13 01:48:46

○A104.16.54.162020-12-11 → 2021-06-11 · 5 obs

○ 2019-09-27 11:03:56
● 2020-12-11 18:57:04
● 2021-06-11 19:45:26
○ 2026-02-15 01:36:08
○ 2026-03-13 01:48:46

○A104.16.55.162020-12-11 → 2021-06-11 · 5 obs

○ 2019-09-27 11:03:56
● 2020-12-11 18:57:04
● 2021-06-11 19:45:26
○ 2026-02-15 01:36:08
○ 2026-03-13 01:48:46

●A104.17.6.582026-02-15 → 2026-03-13 · 3 obs

○ 2021-06-11 19:45:26
● 2026-02-15 01:36:08
● 2026-03-13 01:48:46

●A104.18.64.822026-02-15 → 2026-03-13 · 3 obs

○ 2021-06-11 19:45:26
● 2026-02-15 01:36:08
● 2026-03-13 01:48:46

○A140.147.249.72009-07-03 → 2016-07-18 · 4 obs

● 2009-07-03 09:42:02
● 2016-07-18 08:46:42
○ 2016-07-27 19:58:06
○ 2026-03-13 01:48:46

○A2606:4700::6810:36102020-12-11 → 2021-06-11 · 5 obs

○ 2019-09-27 11:03:56
● 2020-12-11 18:57:04
● 2021-06-11 19:45:26
○ 2026-02-15 01:36:08
○ 2026-03-13 01:48:46

○A2606:4700::6810:37102020-12-11 → 2021-06-11 · 5 obs

○ 2019-09-27 11:03:56
● 2020-12-11 18:57:04
● 2021-06-11 19:45:26
○ 2026-02-15 01:36:08
○ 2026-03-13 01:48:46

●A2606:4700::6811:63a2026-02-15 → 2026-03-13 · 3 obs

○ 2021-06-11 19:45:26
● 2026-02-15 01:36:08
● 2026-03-13 01:48:46

●A2606:4700::6812:40522026-02-15 → 2026-03-13 · 3 obs

○ 2021-06-11 19:45:26
● 2026-02-15 01:36:08
● 2026-03-13 01:48:46

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
gov	a.ns.gov, b.ns.gov, c.ns.gov, d.ns.gov	-
loc.gov	alice.ns.cloudflare.com, kevin.ns.cloudflare.com	-

✅ Authoritative Response

Server: 108.162.193.191

NS records: alice.ns.cloudflare.com, kevin.ns.cloudflare.com

🔒 DNSSEC Status

🔐 Secure (DNSSEC validated)

Chain of trust verified from root to domain

⏱️ Timing

Total: 544ms | Queries: -

📄 Records

Type	Count	Sample Data
A	2	`104.18.64.82, 104.17.6.58`
AAAA	2	`2606:4700::6812:4052, 2606:4700::6811:63a`
NS	2	`alice.ns.cloudflare.com, kevin.ns.cloudflare.com`
MX	2	`mxa-00026101.gslb.gpphosted.com (pri: 10, mxb-00026101.gslb.gpphosted.com (pri: 10`
TXT	11	`538fe1481176c669d55eb1a37227bd0a3ccfb28d, 62QSYa/kfNXdxXnLjT9/ZOyvqed/KSL3dFy+b7K7...`
HTTPS	1	`{"priority":1,"target":".","alpn":["h2"]`
SOA	1	`alice.ns.cloudflare.com dns.cloudflare.c`

Analysis

Hierarchy

loc.gov is the parent of ftp.loc.gov, pws1b.loc.gov, bard.loc.gov, stream-media.loc.gov, ipp24.loc.gov and hundreds of other host names.

IP Addresses

loc.gov resolves to four IP numbers: 2606:4700::6811:63a, 2606:4700::6812:4052, 104.17.6.58 and 104.18.64.82.

other host names for instance lcweb4.loc.gov, blogs.loc.gov.cdn.cloudflare.net, bard.loc.gov, stream-media.loc.gov and ipp24.loc.gov share IP numbers with loc.gov.

Name Servers

loc.gov is delegated to two name servers: alice.ns.cloudflare.com and kevin.ns.cloudflare.com.

loc.gov shares the same name server setup as other domains, for example congress.gov, bestrestroom.com, americanmemory.us, cintas-il.com and cintastraining.com.

loc.gov at least partially shares name servers with other domains, for instance datatranslation.us, doooog.com, livesperm.com, 51h5.online and companybusinesscards.com.

These name servers are commonly used with josh.ns.cloudflare.com, piotr.ns.cloudflare.com, gerald.ns.cloudflare.com and martin.ns.cloudflare.com.

Host names with six IP numbers:

alice.ns.cloudflare.com points to: 2606:4700:50::adf5:3a3c, 2803:f800:50::6ca2:c03c, 2a06:98c1:50::ac40:203c, 108.162.192.60, 172.64.32.60 and 173.245.58.60; kevin.ns.cloudflare.com points to: 2606:4700:58::adf5:3bbf, 2803:f800:50::6ca2:c1bf, 2a06:98c1:50::ac40:21bf, 108.162.193.191, 172.64.33.191 and 173.245.59.191.

Mail Servers

loc.gov is handled by two mail servers: mxa-00026101.gslb.gpphosted.com and mxb-00026101.gslb.gpphosted.com.

loc.gov shares the same mail server setup as other domains, for instance ccb.gov, ocwr.gov, copyright.gov, compliance.gov and openworld.gov.

Host names with one IP number:

The host mxa-00026101.gslb.gpphosted.com points to 66.159.228.43 and the host mxb-00026101.gslb.gpphosted.com points to 66.159.227.43.

loc.gov - robtex.com

loc.gov

gov

Library of Congress

Key Services

Infrastructure

Subdomains

Same first word

Similar names

DNS History

🔍 DNS Trace

📋 Delegation Chain

✅ Authoritative Response

🔒 DNSSEC Status

⏱️ Timing

📄 Records

Analysis

Hierarchy

IP Addresses

Name Servers

Mail Servers

`loc.gov`

`gov`