ASN Lookup Tool

County of San Diego sdcounty.ca.gov US US 12 Routes

AS Data

AS401851

AS401851 – County of San Diego

AS Number 401851
AS Name COSD
Organization County of San Diego(nmd)
Country US
Website sdcounty.ca.gov
Number of IPv4 Routes 12
Number of IPv6 Routes 0
ASN type GOVERNMENT
Registry ARIN
Date Allocated 2025-07-21

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Use ASN data for AS401851 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route # IPs
209.77.1.0/24 256
170.213.6.0/24 256
170.213.5.0/24 256
170.213.133.0/24 256
170.213.7.0/24 256
170.213.131.0/24 256
170.213.132.0/24 256
170.213.3.0/24 256
170.213.18.0/23 512
170.213.4.0/24 256

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:       401851
ASName:         COSD
ASHandle:       AS401851
RegDate:        2025-07-21
Updated:        2025-07-21    
Ref:            https://rdap.arin.net/registry/autnum/401851


OrgName:        County of San Diego
OrgId:          NMD
Address:        The County of San Diego
Address:        County Technology Office
Address:        1600 Pacific Highway Room 306F
City:           San Diego
StateProv:      CA
PostalCode:     92101
Country:        US
RegDate:        1995-02-10
Updated:        2025-06-27
Ref:            https://rdap.arin.net/registry/entity/NMD


OrgAbuseHandle: GENER99-ARIN
OrgAbuseName:   General Contact 
OrgAbusePhone:  +1-858-245-8374 
OrgAbuseEmail:  melanie.caramat@sdcounty.ca.gov
OrgAbuseRef:    https://rdap.arin.net/registry/entity/GENER99-ARIN

OrgTechHandle: GENER99-ARIN
OrgTechName:   General Contact 
OrgTechPhone:  +1-858-245-8374 
OrgTechEmail:  melanie.caramat@sdcounty.ca.gov
OrgTechRef:    https://rdap.arin.net/registry/entity/GENER99-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
AS7018 AT&T Enterprises, LLC US

Upstreams

AS Number Description Country
AS7018 AT&T Enterprises, LLC US

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Frequently Asked Questions

ASN AS401851 is an Autonomous System Number used to identify a network for BGP internet routing.
AS401851 is listed under County of San Diego.
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.