ASN AS18558 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS18558?

AS18558 is listed under Riverside County Office of Education.

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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AS18558 Riverside County Office of Education

ASN Lookup Tool

Riverside County Office of Education rcoe.us

US 142 Routes

AS Data

AS18558

AS18558 – Riverside County Office of Education

AS Number	18558
AS Name	NETBLK-RCOEK
Organization	Riverside County Office of Education(rcoe)
Country	US
Website	rcoe.us
Number of IPv4 Routes	141
Number of IPv6 Routes	1
ASN type	GOVERNMENT
Registry	ARIN
Date Allocated	2000-09-12

ASN Intelligence API for production workflows

Use ASN data for AS18558 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
204.100.38.0/24	AS18558	Riverside County Office of Education	County of Riverside	256
204.100.133.0/24	AS18558	Riverside County Office of Education	County of Riverside	256
204.100.89.0/24	AS18558	Riverside County Office of Education	County of Riverside	256
204.100.59.0/24	AS18558	Riverside County Office of Education	County of Riverside	256
204.100.231.0/24	AS18558	Riverside County Office of Education	County of Riverside	256
204.100.201.0/24	AS18558	Riverside County Office of Education	County of Riverside	256
204.100.243.0/24	AS18558	Riverside County Office of Education	County of Riverside	256
204.100.103.0/24	AS18558	Riverside County Office of Education	County of Riverside	256
204.100.175.0/24	AS18558	Riverside County Office of Education	County of Riverside	256
204.100.184.0/24	AS18558	Riverside County Office of Education	County of Riverside	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:       18558
ASName:         NETBLK-RCOEK
ASHandle:       AS18558
RegDate:        2000-09-12
Updated:        2025-10-20    
Ref:            https://rdap.arin.net/registry/autnum/18558


OrgName:        Riverside County Office of Education
OrgId:          RCOE
Address:        3939 13th Street
City:           Riverside
StateProv:      CA
PostalCode:     92502
Country:        US
RegDate:        2000-09-12
Updated:        2025-10-20
Ref:            https://rdap.arin.net/registry/entity/RCOE


OrgTechHandle: ELLIS608-ARIN
OrgTechName:   Ellis, Jared 
OrgTechPhone:  +1-951-826-6556 
OrgTechEmail:  jellis@rcoe.us
OrgTechRef:    https://rdap.arin.net/registry/entity/ELLIS608-ARIN

OrgAbuseHandle: WILKI325-ARIN
OrgAbuseName:   Wilkinson, David 
OrgAbusePhone:  +1-951-826-6560 
OrgAbuseEmail:  dwilkinson@rcoe.us
OrgAbuseRef:    https://rdap.arin.net/registry/entity/WILKI325-ARIN

OrgNOCHandle: WILKI325-ARIN
OrgNOCName:   Wilkinson, David 
OrgNOCPhone:  +1-951-826-6560 
OrgNOCEmail:  dwilkinson@rcoe.us
OrgNOCRef:    https://rdap.arin.net/registry/entity/WILKI325-ARIN

OrgRoutingHandle: WILKI325-ARIN
OrgRoutingName:   Wilkinson, David 
OrgRoutingPhone:  +1-951-826-6560 
OrgRoutingEmail:  dwilkinson@rcoe.us
OrgRoutingRef:    https://rdap.arin.net/registry/entity/WILKI325-ARIN

OrgDNSHandle: WILKI325-ARIN
OrgDNSName:   Wilkinson, David 
OrgDNSPhone:  +1-951-826-6560 
OrgDNSEmail:  dwilkinson@rcoe.us
OrgDNSRef:    https://rdap.arin.net/registry/entity/WILKI325-ARIN

OrgTechHandle: WILKI325-ARIN
OrgTechName:   Wilkinson, David 
OrgTechPhone:  +1-951-826-6560 
OrgTechEmail:  dwilkinson@rcoe.us
OrgTechRef:    https://rdap.arin.net/registry/entity/WILKI325-ARIN

RAbuseHandle: WILKI325-ARIN
RAbuseName:   Wilkinson, David 
RAbusePhone:  +1-951-826-6560 
RAbuseEmail:  dwilkinson@rcoe.us
RAbuseRef:    https://rdap.arin.net/registry/entity/WILKI325-ARIN

RTechHandle: WILKI325-ARIN
RTechName:   Wilkinson, David 
RTechPhone:  +1-951-826-6560 
RTechEmail:  dwilkinson@rcoe.us
RTechRef:    https://rdap.arin.net/registry/entity/WILKI325-ARIN

RNOCHandle: WILKI325-ARIN
RNOCName:   Wilkinson, David 
RNOCPhone:  +1-951-826-6560 
RNOCEmail:  dwilkinson@rcoe.us
RNOCRef:    https://rdap.arin.net/registry/entity/WILKI325-ARIN

RTechHandle: ELLIS608-ARIN
RTechName:   Ellis, Jared 
RTechPhone:  +1-951-826-6556 
RTechEmail:  jellis@rcoe.us
RTechRef:    https://rdap.arin.net/registry/entity/ELLIS608-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
AS395643	Corona-Norco Unified School District	US
AS401974	Val Verde Unified School District	US
AS2152	CENIC	US
AS395643	Corona Norco Unified School District	US

Upstreams

AS Number	Description	Country
AS2152	CENIC	US

Downstreams

AS Number	Description	Country
AS401974	Val Verde Unified School District	US
AS395643	Corona Norco Unified School District	US