AS20315 — MCHENRY-COUNTY-AS1 - McHenry County

AS20315 announces 3 IPv4 prefixes covering 768 addresses and 0 IPv6 prefixes.

About this network

MCHENRY-COUNTY-AS1 is operated by McHenry County, a local government entity in Illinois.

What it's used for

• The address space carries municipal infrastructure, evidenced by netnames MCHEN-1 and SBC-68-21-116-0-24-0711150040 and reverse DNS entries pointing to ded.ameritech.net.
• The AS announces 768 IPv4 addresses across 3 prefixes with 3 observed neighbours, indicating a small, self-contained government network rather than a transit or large-scale access provider.

Notable

• Registrants include AT&T Services, Inc. for the 12.206.214.0/24 block (netname ATTWORLD28), alongside McHenry County for the other two prefixes, suggesting a mix of legacy leased space and direct county holdings.
• The inventory consists of three distinct /24 blocks, including a legacy AT&T WorldNet address range and two blocks associated with SBC/Ameritech history.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 12.206.214.0/24
• 68.21.116.0/24
• 162.142.124.0/24

Upstream networks

• AS33491 Comcast Cable Communications, LLC
• AS13335 Cloudflare, Inc.
• AS7018 AT&T Enterprises, LLC

Adjacent networks

• AS33491 Comcast Cable Communications, LLC
• AS13335 Cloudflare, Inc.
• AS7018 AT&T Enterprises, LLC

Routing security

• RPKI: 0 valid, 0 invalid and 3 not-found announcements; 0 ROAs.
• ASPA: none published.
• IRR: 100% of announcements registered; 4 route objects.
• Listed in as-sets: AS-COMCAST-EDIA, AS-ICN-CUSTOMERS, AS-KDDCUSTOMER2, AS-TELSTRA-INTL-CUSTOMERS, AS13335:AS-CUSTOMERS.