ASN AS27321 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS27321?

AS27321 is listed under Internet Systems Consortium, Inc..

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.

AS27321 Internet Systems Consortium, Inc.

ASN Lookup Tool

Internet Systems Consortium, Inc. isc.org

US 8 Routes

AS Data

AS27321

AS27321 – Internet Systems Consortium, Inc.

AS Number	27321
AS Name	ISC-F-AS
Organization	Internet Systems Consortium, Inc.(isc-94)
Country	US
Website	isc.org
Number of IPv4 Routes	7
Number of IPv6 Routes	1
ASN type	ISP
Registry	ARIN
Date Allocated	2003-02-12

ASN Intelligence API for production workflows

Use ASN data for AS27321 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

Get ASN API Key ASN API Docs

IP Ranges

Route	Origin	Origin Name	ISP	# IPs
149.20.3.0/24	AS27321	Internet Systems Consortium, Inc.	Internet Systems Consortium, Inc.	256
192.158.249.0/24	AS27321	Internet Systems Consortium, Inc.	Internet Systems Consortium, Inc.	256
192.158.248.0/24	AS27321	Internet Systems Consortium, Inc.	Internet Systems Consortium, Inc.	256
149.20.57.0/24	AS27321	Internet Systems Consortium, Inc.	Internet Systems Consortium, Inc.	256
2001:500:6b::/48	AS27321	Internet Systems Consortium, Inc.	Internet Systems Consortium, Inc.	~1×10²⁴
149.20.4.0/24	AS27321	Internet Systems Consortium, Inc.	Internet Systems Consortium, Inc.	256
149.20.66.0/24	AS27321	Internet Systems Consortium, Inc.	Internet Systems Consortium, Inc.	256
149.20.2.0/24	AS27321	Internet Systems Consortium, Inc.	Internet Systems Consortium, Inc.	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:       27318 - 27322
ASName:         ISC-F-AS
ASHandle:       AS27318
RegDate:        2003-02-12
Updated:        2012-02-24    
Ref:            https://rdap.arin.net/registry/autnum/27318


OrgName:        Internet Systems Consortium, Inc.
OrgId:          ISC-94
Address:        PO Box 360
City:           Newmarket
StateProv:      NH
PostalCode:     03857
Country:        US
RegDate:        2004-01-09
Updated:        2024-01-03
Ref:            https://rdap.arin.net/registry/entity/ISC-94


OrgTechHandle: JSO127-ARIN
OrgTechName:   Osborn, Jeffrey Scott
OrgTechPhone:  +1-408-455-8258 
OrgTechEmail:  jeff@isc.org
OrgTechRef:    https://rdap.arin.net/registry/entity/JSO127-ARIN

OrgNOCHandle: ISCN-ARIN
OrgNOCName:   Internet Systems Consortium NOC
OrgNOCPhone:  +1-650-423-1310 
OrgNOCEmail:  noc@isc.org
OrgNOCRef:    https://rdap.arin.net/registry/entity/ISCN-ARIN

OrgTechHandle: BELLI82-ARIN
OrgTechName:   Bellis, Ray 
OrgTechPhone:  +1-650-423-1300 
OrgTechEmail:  ray@isc.org
OrgTechRef:    https://rdap.arin.net/registry/entity/BELLI82-ARIN

OrgTechHandle: ISCN-ARIN
OrgTechName:   Internet Systems Consortium NOC
OrgTechPhone:  +1-650-423-1310 
OrgTechEmail:  noc@isc.org
OrgTechRef:    https://rdap.arin.net/registry/entity/ISCN-ARIN

OrgAbuseHandle: ISCAT-ARIN
OrgAbuseName:   Internet Systems Consortium Abuse Team
OrgAbusePhone:  +1-650-423-1300 
OrgAbuseEmail:  abuse@isc.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/ISCAT-ARIN

OrgTechHandle: RA15-ARIN
OrgTechName:   Adams, Rick 
OrgTechPhone:  +1-703-255-5527 
OrgTechEmail:  rick@cello.net
OrgTechRef:    https://rdap.arin.net/registry/entity/RA15-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
AS58057	Securebit AG	CH
AS398447	OHANACRAFT, LLC	US
AS36236	NetActuate, Inc	US
AS10111	Zeofast Network	CN
AS3557	Internet Systems Consortium, Inc.	US
AS34927	iFog GmbH	CH
AS6939	Hurricane Electric LLC	US
AS8298	IPng Networks GmbH	CH
AS400587	Ryamer, LLC	US
AS6461	Zayo Bandwidth	US