ASN AS21519 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS21519?

AS21519 is listed under Sinclair Broadcast Group, 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.

AS21519 Sinclair Broadcast Group, Inc.

ASN Lookup Tool

Sinclair Broadcast Group, Inc. sbgtv.com

US 1 Routes

AS Data

AS21519

AS21519 – Sinclair Broadcast Group, Inc.

AS Number	21519
AS Name	SBG-AS2
Organization	Sinclair Broadcast Group, Inc.(sincla-9)
Country	US
Website	sbgtv.com
Number of IPv4 Routes	1
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	2016-03-08

ASN Intelligence API for production workflows

Use ASN data for AS21519 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
208.73.28.0/22	AS21519	Sinclair Broadcast Group, Inc.	Sinclair Broadcast Group, Inc.	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:       21519
ASName:         SBG-AS2
ASHandle:       AS21519
RegDate:        2016-03-08
Updated:        2016-03-08    
Ref:            https://rdap.arin.net/registry/autnum/21519


OrgName:        Sinclair Broadcast Group, Inc.
OrgId:          SINCLA-9
Address:        10706 Beaver Dam Rd
City:           Cockeysville
StateProv:      MD
PostalCode:     21030
Country:        US
RegDate:        2001-06-27
Updated:        2025-01-29
Ref:            https://rdap.arin.net/registry/entity/SINCLA-9


OrgTechHandle: ROBER1896-ARIN
OrgTechName:   Robertson, Omar 
OrgTechPhone:  +1-410-891-3318 
OrgTechEmail:  oorobertson@sbgtv.com
OrgTechRef:    https://rdap.arin.net/registry/entity/ROBER1896-ARIN

OrgTechHandle: JNL15-ARIN
OrgTechName:   Laughton, John N.
OrgTechPhone:  +1-410-568-1547 
OrgTechEmail:  jlaughto@sbgnet.com
OrgTechRef:    https://rdap.arin.net/registry/entity/JNL15-ARIN

OrgTechHandle: HOOTS6-ARIN
OrgTechName:   Hoots, Ian 
OrgTechPhone:  +1-410-568-2179 
OrgTechEmail:  tihoots@sbgtv.com
OrgTechRef:    https://rdap.arin.net/registry/entity/HOOTS6-ARIN

OrgAbuseHandle: JNL15-ARIN
OrgAbuseName:   Laughton, John N.
OrgAbusePhone:  +1-410-568-1547 
OrgAbuseEmail:  jlaughto@sbgnet.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/JNL15-ARIN

OrgNOCHandle: KEMPB2-ARIN
OrgNOCName:   Kemp, Brian 
OrgNOCPhone:  +1-410-568-1539 
OrgNOCEmail:  bkemp@sbgtv.com
OrgNOCRef:    https://rdap.arin.net/registry/entity/KEMPB2-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
AS701	Verizon Business/UUnet	US
AS3356	Level 3 Parent, LLC	US
AS6461	Zayo Bandwidth	US
AS701	Verizon Business	US

Upstreams

AS Number	Description	Country
AS3356	Level 3 Parent, LLC	US
AS6461	Zayo Bandwidth	US
AS701	Verizon Business	US