ASN AS12145 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS12145?

AS12145 is listed under Colorado State University.

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.

AS12145 Colorado State University

ASN Lookup Tool

Colorado State University colostate.edu

US 3 Routes

AS Data

AS12145

AS12145 – Colorado State University

AS Number	12145
AS Name	COLORADOSTATEUNIV
Organization	Colorado State University(csu-2)
Country	US
Website	colostate.edu
Number of IPv4 Routes	3
Number of IPv6 Routes	0
ASN type	EDUCATION
Registry	ARIN
Date Allocated	1999-04-06

ASN Intelligence API for production workflows

Use ASN data for AS12145 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
129.19.0.0/18	AS12145	Colorado State University	Colorado State University	16384
129.19.3.0/24	AS12145	Colorado State University	Colorado State University	256
129.82.0.0/16	AS12145	Colorado State University	Colorado State University	65536

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:       12145
ASName:         COLORADOSTATEUNIV
ASHandle:       AS12145
RegDate:        1999-04-06
Updated:        2022-07-14    
Ref:            https://rdap.arin.net/registry/autnum/12145


OrgName:        Colorado State University
OrgId:          CSU-2
Address:        Academic Computing and Networking Services
Address:        Colorado State University
Address:        1018 Campus Delivery
City:           Fort Collins
StateProv:      CO
PostalCode:     80523
Country:        US
RegDate:        
Updated:        2024-11-25
Ref:            https://rdap.arin.net/registry/entity/CSU-2


OrgAbuseHandle: DNSAD191-ARIN
OrgAbuseName:   DNS Administrator
OrgAbusePhone:  +1-970-491-5600 
OrgAbuseEmail:  dns.admin@colostate.edu
OrgAbuseRef:    https://rdap.arin.net/registry/entity/DNSAD191-ARIN

OrgTechHandle: DNSAD191-ARIN
OrgTechName:   DNS Administrator
OrgTechPhone:  +1-970-491-5600 
OrgTechEmail:  dns.admin@colostate.edu
OrgTechRef:    https://rdap.arin.net/registry/entity/DNSAD191-ARIN

RTechHandle: ASMUS11-ARIN
RTechName:   Asmus, Angie 
RTechPhone:  +1-970-491-7582 
RTechEmail:  angie.asmus@colostate.edu
RTechRef:    https://rdap.arin.net/registry/entity/ASMUS11-ARIN

RTechHandle: MPW-ARIN
RTechName:   Willard, Michael Patrick
RTechPhone:  +1-970-491-4651 
RTechEmail:  mike.willard@colostate.edu
RTechRef:    https://rdap.arin.net/registry/entity/MPW-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
AS31991	Platte River Power Authority	US
AS394748	City of Fort Collins	US
AS14041	University Corporation for Atmospheric Research	US
AS54669	Larimer County Government	US
AS54060	Poudre School District R-1	US
AS54060	Poudre School District R 1	US
AS25825	Poudre Valley Health Care, Inc.	US

Upstreams

AS Number	Description	Country
AS14041	University Corporation for Atmospheric Research	US

Downstreams

AS Number	Description	Country
AS31991	Platte River Power Authority	US
AS394748	City of Fort Collins	US
AS54669	Larimer County Government	US
AS54060	Poudre School District R 1	US
AS25825	Poudre Valley Health Care, Inc.	US