ASN AS12156 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS12156?

AS12156 is listed under City of Aurora Colorado.

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?

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AS12156 City of Aurora Colorado

ASN Lookup Tool

City of Aurora Colorado auroragov.org

US 6 Routes

AS Data

AS12156

AS12156 – City of Aurora Colorado

AS Number	12156
AS Name	AURORA-COLORADO
Organization	City of Aurora Colorado(cac-3)
Country	US
Website	auroragov.org
Number of IPv4 Routes	6
Number of IPv6 Routes	0
ASN type	GOVERNMENT
Registry	ARIN
Date Allocated	2018-01-24

ASN Intelligence API for production workflows

Use ASN data for AS12156 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
205.167.144.0/23	AS12156	City of Aurora Colorado	City of Aurora Colorado	512
198.199.188.0/24	AS12156	City of Aurora Colorado	City of Aurora Colorado	256
198.199.187.0/24	AS12156	City of Aurora Colorado	City of Aurora Colorado	256
198.148.209.0/24	AS12156	City of Aurora Colorado	CITY OF AURORA	256
205.167.144.0/24	AS12156	City of Aurora Colorado	City of Aurora Colorado	256
192.78.99.0/24	AS12156	City of Aurora Colorado	CITY OF AURORA	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:       12156
ASName:         AURORA-COLORADO
ASHandle:       AS12156
RegDate:        2018-01-24
Updated:        2018-01-24    
Ref:            https://rdap.arin.net/registry/autnum/12156


OrgName:        City of Aurora Colorado
OrgId:          CAC-3
Address:        15151 E. Alameda Parkway
Address:        Information Technology
City:           Aurora
StateProv:      CO
PostalCode:     80012
Country:        US
RegDate:        1994-03-14
Updated:        2022-07-12
Ref:            https://rdap.arin.net/registry/entity/CAC-3


OrgTechHandle: COAAR-ARIN
OrgTechName:   COA-ARIN
OrgTechPhone:  +1-303-739-7545 
OrgTechEmail:  COA-ARIN@auroragov.org
OrgTechRef:    https://rdap.arin.net/registry/entity/COAAR-ARIN

OrgRoutingHandle: OTIEN-ARIN
OrgRoutingName:   Otieno, Eric 
OrgRoutingPhone:  +1-303-739-7557 
OrgRoutingEmail:  eotieno@auroragov.org
OrgRoutingRef:    https://rdap.arin.net/registry/entity/OTIEN-ARIN

OrgRoutingHandle: SMITH6162-ARIN
OrgRoutingName:   Smith, Josh 
OrgRoutingPhone:  +1-303-739-7760 
OrgRoutingEmail:  jomsmith@auroragov.org
OrgRoutingRef:    https://rdap.arin.net/registry/entity/SMITH6162-ARIN

OrgAbuseHandle: NEWMA272-ARIN
OrgAbuseName:   NEWMAN, SCOTT 
OrgAbusePhone:  +1-303-739-7015 
OrgAbuseEmail:  smnewman@auroragov.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/NEWMA272-ARIN

OrgTechHandle: SMITH6162-ARIN
OrgTechName:   Smith, Josh 
OrgTechPhone:  +1-303-739-7760 
OrgTechEmail:  jomsmith@auroragov.org
OrgTechRef:    https://rdap.arin.net/registry/entity/SMITH6162-ARIN

OrgDNSHandle: SMITH6162-ARIN
OrgDNSName:   Smith, Josh 
OrgDNSPhone:  +1-303-739-7760 
OrgDNSEmail:  jomsmith@auroragov.org
OrgDNSRef:    https://rdap.arin.net/registry/entity/SMITH6162-ARIN

OrgNOCHandle: NEWMA272-ARIN
OrgNOCName:   NEWMAN, SCOTT 
OrgNOCPhone:  +1-303-739-7015 
OrgNOCEmail:  smnewman@auroragov.org
OrgNOCRef:    https://rdap.arin.net/registry/entity/NEWMA272-ARIN

OrgAbuseHandle: SMITH6162-ARIN
OrgAbuseName:   Smith, Josh 
OrgAbusePhone:  +1-303-739-7760 
OrgAbuseEmail:  jomsmith@auroragov.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/SMITH6162-ARIN

OrgAbuseHandle: OTIEN-ARIN
OrgAbuseName:   Otieno, Eric 
OrgAbusePhone:  +1-303-739-7557 
OrgAbuseEmail:  eotieno@auroragov.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/OTIEN-ARIN

OrgDNSHandle: NEWMA272-ARIN
OrgDNSName:   NEWMAN, SCOTT 
OrgDNSPhone:  +1-303-739-7015 
OrgDNSEmail:  smnewman@auroragov.org
OrgDNSRef:    https://rdap.arin.net/registry/entity/NEWMA272-ARIN

OrgNOCHandle: OTIEN-ARIN
OrgNOCName:   Otieno, Eric 
OrgNOCPhone:  +1-303-739-7557 
OrgNOCEmail:  eotieno@auroragov.org
OrgNOCRef:    https://rdap.arin.net/registry/entity/OTIEN-ARIN

OrgNOCHandle: SMITH6162-ARIN
OrgNOCName:   Smith, Josh 
OrgNOCPhone:  +1-303-739-7760 
OrgNOCEmail:  jomsmith@auroragov.org
OrgNOCRef:    https://rdap.arin.net/registry/entity/SMITH6162-ARIN

OrgTechHandle: OTIEN-ARIN
OrgTechName:   Otieno, Eric 
OrgTechPhone:  +1-303-739-7557 
OrgTechEmail:  eotieno@auroragov.org
OrgTechRef:    https://rdap.arin.net/registry/entity/OTIEN-ARIN

OrgTechHandle: NEWMA272-ARIN
OrgTechName:   NEWMAN, SCOTT 
OrgTechPhone:  +1-303-739-7015 
OrgTechEmail:  smnewman@auroragov.org
OrgTechRef:    https://rdap.arin.net/registry/entity/NEWMA272-ARIN

OrgRoutingHandle: NEWMA272-ARIN
OrgRoutingName:   NEWMAN, SCOTT 
OrgRoutingPhone:  +1-303-739-7015 
OrgRoutingEmail:  smnewman@auroragov.org
OrgRoutingRef:    https://rdap.arin.net/registry/entity/NEWMA272-ARIN

OrgDNSHandle: OTIEN-ARIN
OrgDNSName:   Otieno, Eric 
OrgDNSPhone:  +1-303-739-7557 
OrgDNSEmail:  eotieno@auroragov.org
OrgDNSRef:    https://rdap.arin.net/registry/entity/OTIEN-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
AS209	CenturyLink Communications, LLC	US
AS13649	Flexential Colorado Corp.	US
AS33652	Comcast Cable Communications, LLC	US

Upstreams

AS Number	Description	Country
AS209	CenturyLink Communications, LLC	US
AS13649	Flexential Colorado Corp.	US
AS33652	Comcast Cable Communications, LLC	US