ASN AS20381 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS20381?

AS20381 is listed under Cable Television Laboratories, 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.

AS20381 Cable Television Laboratories, Inc.

ASN Lookup Tool

Cable Television Laboratories, Inc. cablelabs.com

US 4 Routes

AS Data

AS20381

AS20381 – Cable Television Laboratories, Inc.

AS Number	20381
AS Name	CABLELABS-LV
Organization	Cable Television Laboratories, Inc.(ctl-12)
Country	US
Website	cablelabs.com
Number of IPv4 Routes	3
Number of IPv6 Routes	1
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2001-05-01

ASN Intelligence API for production workflows

Use ASN data for AS20381 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

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
8.36.234.0/24	AS20381	Cable Television Laboratories, Inc.	Level 3 Parent, LLC	256
192.160.73.0/24	AS20381	Cable Television Laboratories, Inc.	Cable Television Laboratories, Inc.	256
50.202.218.0/24	AS20381	Cable Television Laboratories, Inc.	Comcast Cable Communications, LLC	256
2620:0:2b10::/48	AS20381	Cable Television Laboratories, Inc.	Cable Television Laboratories, Inc.	~1×10²⁴

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:       20381
ASName:         CABLELABS-LV
ASHandle:       AS20381
RegDate:        2001-05-01
Updated:        2018-01-25    
Ref:            https://rdap.arin.net/registry/autnum/20381


OrgName:        Cable Television Laboratories, Inc.
OrgId:          CTL-12
Address:        858 Coal Creek Circle
City:           Louisville
StateProv:      CO
PostalCode:     80027-9750
Country:        US
RegDate:        1992-05-14
Updated:        2011-09-24
Ref:            https://rdap.arin.net/registry/entity/CTL-12


OrgAbuseHandle: DNSIN1-ARIN
OrgAbuseName:   DNS Info
OrgAbusePhone:  +1-303-661-9100 
OrgAbuseEmail:  dnsinfo@cablelabs.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/DNSIN1-ARIN

OrgTechHandle: DNSIN1-ARIN
OrgTechName:   DNS Info
OrgTechPhone:  +1-303-661-9100 
OrgTechEmail:  dnsinfo@cablelabs.com
OrgTechRef:    https://rdap.arin.net/registry/entity/DNSIN1-ARIN

RTechHandle: DNSIN1-ARIN
RTechName:   DNS Info
RTechPhone:  +1-303-661-9100 
RTechEmail:  dnsinfo@cablelabs.com
RTechRef:    https://rdap.arin.net/registry/entity/DNSIN1-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
AS3549	Level 3 Communications, Inc. (GBLX)	US
AS3356	Level 3 Parent, LLC	US
AS33652	Comcast Cable Communications, LLC	US

Upstreams

AS Number	Description	Country
AS3356	Level 3 Parent, LLC	US
AS33652	Comcast Cable Communications, LLC	US