ASN Lookup Tool

US Oncology, Inc. mckesson.com US US 3 Routes

AS Data

AS27451

AS27451 – US Oncology, Inc.

AS Number 27451
AS Name USO-ASN
Organization US Oncology, Inc.(usonc)
Country US
Website mckesson.com
Number of IPv4 Routes 3
Number of IPv6 Routes 0
ASN type BUSINESS
Registry ARIN
Date Allocated 2003-03-10

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Use ASN data for AS27451 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route # IPs
38.68.63.0/24 256
206.203.80.0/24 256
206.203.81.0/24 256

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:       27451
ASName:         USO-ASN
ASHandle:       AS27451
RegDate:        2003-03-10
Updated:        2012-03-02    
Ref:            https://rdap.arin.net/registry/autnum/27451


OrgName:        US Oncology, Inc.
OrgId:          USONC
Address:        10101 Woodloch Forest
City:           The Woodlands
StateProv:      TX
PostalCode:     77380
Country:        US
RegDate:        2003-02-25
Updated:        2023-03-22
Comment:        US Oncology Inc is a subsidiary of McKesson.
Ref:            https://rdap.arin.net/registry/entity/USONC


OrgTechHandle: NIT2-ARIN
OrgTechName:   Network Infrastructure Team
OrgTechPhone:  +1-972-446-4800 
OrgTechEmail:  NetworkInfrastructureTeam2@mckesson.com
OrgTechRef:    https://rdap.arin.net/registry/entity/NIT2-ARIN

OrgAbuseHandle: NIT2-ARIN
OrgAbuseName:   Network Infrastructure Team
OrgAbusePhone:  +1-972-446-4800 
OrgAbuseEmail:  NetworkInfrastructureTeam2@mckesson.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/NIT2-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
AS1239 Cogent Communications, LLC US
AS3356 Level 3 Parent, LLC US
AS174 Cogent Communications, LLC US

Upstreams

AS Number Description Country
AS3356 Level 3 Parent, LLC US
AS174 Cogent Communications, LLC US

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Frequently Asked Questions

ASN AS27451 is an Autonomous System Number used to identify a network for BGP internet routing.
AS27451 is listed under US Oncology, Inc..
Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.
Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.
WHOIS provides registration and contact context for ASN ownership, administration, and operational reference.
This page previews large ASN datasets. Use See more to load additional rows, and upgrade your plan to view complete peer, route, upstream, and downstream data.