What is ASN AS396973?

ASN AS396973 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS396973?

AS396973 is listed under Department of Homeland Security.

What do peers, upstreams, and downstreams mean in ASN data?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access the full ASN tables?

The page shows a preview of large ASN datasets. Use the page controls to load more rows, and upgrade to a paid plan for complete access.

AS396973 Department of Homeland Security

Department of Homeland Security cisa.dhs.gov

US 11 Routes

AS Data

AS396973

AS396973 – Department of Homeland Security

AS Number	396973
AS Name	DHS-39H
Organization	Department of Homeland Security(dhs-39)
Country	US
Website	cisa.dhs.gov
Number of IPv4 Routes	9
Number of IPv6 Routes	2
ASN type	GOVERNMENT
Registry	ARIN
Date Allocated	2018-08-06

ASN Intelligence API for production workflows

Use ASN data for AS396973 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
208.73.189.0/24	AS396973	Department of Homeland Security	Department of Homeland Security	256
208.73.186.0/24	AS396973	Department of Homeland Security	Department of Homeland Security	256
208.73.185.0/24	AS396973	Department of Homeland Security	Department of Homeland Security	256
208.73.184.0/24	AS396973	Department of Homeland Security	Department of Homeland Security	256
64.69.57.0/24	AS396973	Department of Homeland Security	DEPARTMENT OF HOMELAND SECURITY	256
208.73.187.0/24	AS396973	Department of Homeland Security	Department of Homeland Security	256
208.73.188.0/24	AS396973	Department of Homeland Security	Department of Homeland Security	256
208.73.190.0/24	AS396973	Department of Homeland Security	Department of Homeland Security	256
2620:112:5005::/48	AS396973	Department of Homeland Security	Department of Homeland Security	~1×10²⁴
208.73.191.0/24	AS396973	Department of Homeland Security	Department of Homeland Security	256

Raw Whois Response

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#


ASNumber:       396973
ASName:         DHS-39H
ASHandle:       AS396973
RegDate:        2018-08-06
Updated:        2018-08-06    
Ref:            https://rdap.arin.net/registry/autnum/396973


OrgName:        Department of Homeland Security
OrgId:          DHS-39
Address:        1110 North Glebe Road
City:           Arlington
StateProv:      VA
PostalCode:     22201
Country:        US
RegDate:        2006-04-21
Updated:        2026-01-28
Ref:            https://rdap.arin.net/registry/entity/DHS-39


OrgAbuseHandle: DELON43-ARIN
OrgAbuseName:   DeLong, Jeremy 
OrgAbusePhone:  +1-850-307-7275 
OrgAbuseEmail:  jeremy.delong@cisa.dhs.gov
OrgAbuseRef:    https://rdap.arin.net/registry/entity/DELON43-ARIN

OrgTechHandle: MIYAN2-ARIN
OrgTechName:   Miyani, Pratik 
OrgTechPhone:  +1-202-769-6164 
OrgTechEmail:  PRATIK.MIYANI@associates.cisa.dhs.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/MIYAN2-ARIN

OrgTechHandle: SWANS257-ARIN
OrgTechName:   Swanson, Joseph 
OrgTechPhone:  +1-804-334-7410 
OrgTechEmail:  joseph.swanson@implicitsolutionsllc.com
OrgTechRef:    https://rdap.arin.net/registry/entity/SWANS257-ARIN

OrgTechHandle: PARKB18-ARIN
OrgTechName:   Park, Brandon 
OrgTechPhone:  +1-202-294-1939 
OrgTechEmail:  brandon.park@mail.associates.cisa.dhs.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/PARKB18-ARIN

OrgNOCHandle: BEALL59-ARIN
OrgNOCName:   Beall, Nikki 
OrgNOCPhone:  +1-202-320-5578 
OrgNOCEmail:  nikki.beall@mail.cisa.dhs.gov
OrgNOCRef:    https://rdap.arin.net/registry/entity/BEALL59-ARIN

OrgAbuseHandle: LAMAN53-ARIN
OrgAbuseName:   lam, anh-thu 
OrgAbusePhone:  +1-202-394-5951 
OrgAbuseEmail:  anh.lam@mail.cisa.dhs.gov
OrgAbuseRef:    https://rdap.arin.net/registry/entity/LAMAN53-ARIN

OrgDNSHandle: LAMAN53-ARIN
OrgDNSName:   lam, anh-thu 
OrgDNSPhone:  +1-202-394-5951 
OrgDNSEmail:  anh.lam@mail.cisa.dhs.gov
OrgDNSRef:    https://rdap.arin.net/registry/entity/LAMAN53-ARIN

OrgTechHandle: DELON43-ARIN
OrgTechName:   DeLong, Jeremy 
OrgTechPhone:  +1-850-307-7275 
OrgTechEmail:  jeremy.delong@cisa.dhs.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/DELON43-ARIN

OrgNOCHandle: LAMAN53-ARIN
OrgNOCName:   lam, anh-thu 
OrgNOCPhone:  +1-202-394-5951 
OrgNOCEmail:  anh.lam@mail.cisa.dhs.gov
OrgNOCRef:    https://rdap.arin.net/registry/entity/LAMAN53-ARIN

OrgTechHandle: AHI54-ARIN
OrgTechName:   Ibrahim, Ali Husni
OrgTechPhone:  +1-315-516-1151 
OrgTechEmail:  ali.h.ibrahim@associates.cbp.dhs.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/AHI54-ARIN

OrgRoutingHandle: LAMAN53-ARIN
OrgRoutingName:   lam, anh-thu 
OrgRoutingPhone:  +1-202-394-5951 
OrgRoutingEmail:  anh.lam@mail.cisa.dhs.gov
OrgRoutingRef:    https://rdap.arin.net/registry/entity/LAMAN53-ARIN

OrgTechHandle: MURPH652-ARIN
OrgTechName:   Murphy, Marvin 
OrgTechPhone:  +1-850-619-0569 
OrgTechEmail:  marvin.murphy@mail.associates.cisa.dhs.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/MURPH652-ARIN

OrgTechHandle: STARK172-ARIN
OrgTechName:   Starkey, Damon 
OrgTechPhone:  +1-771-202-4748 
OrgTechEmail:  damon.starkey@associates.cisa.dhs.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/STARK172-ARIN

OrgTechHandle: LAMME51-ARIN
OrgTechName:   Lammers, Charles 
OrgTechPhone:  +1-703-424-0591 
OrgTechEmail:  charles.lammers@mail.associates.cisa.dhs.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/LAMME51-ARIN

OrgRoutingHandle: DELON43-ARIN
OrgRoutingName:   DeLong, Jeremy 
OrgRoutingPhone:  +1-850-307-7275 
OrgRoutingEmail:  jeremy.delong@cisa.dhs.gov
OrgRoutingRef:    https://rdap.arin.net/registry/entity/DELON43-ARIN

OrgDNSHandle: STARK172-ARIN
OrgDNSName:   Starkey, Damon 
OrgDNSPhone:  +1-771-202-4748 
OrgDNSEmail:  damon.starkey@associates.cisa.dhs.gov
OrgDNSRef:    https://rdap.arin.net/registry/entity/STARK172-ARIN

OrgNOCHandle: DELON43-ARIN
OrgNOCName:   DeLong, Jeremy 
OrgNOCPhone:  +1-850-307-7275 
OrgNOCEmail:  jeremy.delong@cisa.dhs.gov
OrgNOCRef:    https://rdap.arin.net/registry/entity/DELON43-ARIN

OrgTechHandle: KUMAR402-ARIN
OrgTechName:   Kumar, Asim 
OrgTechPhone:  +1-703-395-5745 
OrgTechEmail:  asim.kumar@associates.cisa.dhs.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/KUMAR402-ARIN

OrgDNSHandle: DELON43-ARIN
OrgDNSName:   DeLong, Jeremy 
OrgDNSPhone:  +1-850-307-7275 
OrgDNSEmail:  jeremy.delong@cisa.dhs.gov
OrgDNSRef:    https://rdap.arin.net/registry/entity/DELON43-ARIN

OrgTechHandle: GROSS398-ARIN
OrgTechName:   Grossman, Stephen 
OrgTechPhone:  +1-301-800-6939 
OrgTechEmail:  stephen.grossman@associates.cisa.dhs.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/GROSS398-ARIN

OrgTechHandle: LAMAN53-ARIN
OrgTechName:   lam, anh-thu 
OrgTechPhone:  +1-202-394-5951 
OrgTechEmail:  anh.lam@mail.cisa.dhs.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/LAMAN53-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#

Parsed Whois Response

Peers

AS Number	Description	Country
AS13335	Cloudflare, Inc.	US
AS7018	AT&T Enterprises, LLC	US

Upstreams

AS Number	Description	Country
AS13335	Cloudflare, Inc.	US
AS7018	AT&T Enterprises, LLC	US

ASN Lookup Tool

ASN Summary