Autonomous System

AS18558 Riverside County Office of Education

EducationActiveUnited StatesARIN

AS18558 (NETBLK-RCOEK) is an education network operated by Riverside County Office of Education in United States, registered with ARIN. It has 140 IPv4 prefixes with 112,640 addresses and 1 IPv6 prefix, which makes it the 2,175th largest of 82,200 active autonomous systems by IPv4 space.

IPv4 addresses112,640in 140 prefixes
IPv6 prefixes1≈ 7.9 × 10²⁸ addresses
Size rank#2,175of 82,200 active ASNs
Abuser scoreVery Lowunder 0.01% of its addresses flagged · method

Details

OrganizationRiverside County Office of Education
AS nameNETBLK-RCOEK
Websitercoe.us
Country United States (US)
Network typeEducation
RegistryARIN
Abuse contactdwilkinson@rcoe.us
Registered2000-09-12
Last updated2025-10-20

IPv4 prefixes

140 prefixes · 112,640 addresses
NetworkAddressesFirst – last address
204.100.0.0/1665,536204.100.0.0 – 204.100.255.255
204.26.32.0/204,096204.26.32.0 – 204.26.47.255
204.26.48.0/212,048204.26.48.0 – 204.26.55.255
204.100.8.0/212,048204.100.8.0 – 204.100.15.255
204.100.16.0/212,048204.100.16.0 – 204.100.23.255
204.100.32.0/221,024204.100.32.0 – 204.100.35.255
204.100.68.0/221,024204.100.68.0 – 204.100.71.255
204.100.136.0/221,024204.100.136.0 – 204.100.139.255
198.188.95.0/24256198.188.95.0 – 198.188.95.255
204.26.56.0/24256204.26.56.0 – 204.26.56.255
204.100.38.0/24256204.100.38.0 – 204.100.38.255
204.100.40.0/24256204.100.40.0 – 204.100.40.255
204.100.41.0/24256204.100.41.0 – 204.100.41.255
204.100.43.0/24256204.100.43.0 – 204.100.43.255
204.100.44.0/24256204.100.44.0 – 204.100.44.255
204.100.56.0/24256204.100.56.0 – 204.100.56.255
204.100.58.0/24256204.100.58.0 – 204.100.58.255
204.100.59.0/24256204.100.59.0 – 204.100.59.255
204.100.60.0/24256204.100.60.0 – 204.100.60.255
204.100.61.0/24256204.100.61.0 – 204.100.61.255
204.100.65.0/24256204.100.65.0 – 204.100.65.255
204.100.66.0/24256204.100.66.0 – 204.100.66.255
204.100.67.0/24256204.100.67.0 – 204.100.67.255
204.100.72.0/24256204.100.72.0 – 204.100.72.255
204.100.73.0/24256204.100.73.0 – 204.100.73.255
The 25 largest of 140. The API and the database have all of them.

IPv6 prefixes

1 prefix
  • 2607:f708::/32

Query AS18558 with the API

The ASN lookup returns everything on this page as JSON, including every prefix. ASN lookups need an API key: a free account comes with 1,000 requests a day. 

curl "https://api.ipapi.is/?q=AS18558&key=YOUR_API_KEY"

Any address in its prefixes resolves to AS18558, with or without a key:

curl "https://api.ipapi.is/?q=204.100.0.1"

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