asn.dev

Autonomous system

AS20315 MCHENRY-COUNTY-AS1 - McHenry County

Unclassified ARIN

IPv4 addresses 768 3 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 3 0 downstream
Flagged prefixes 0 none

Summary

McHenry County

United States of America · AI-generated

government municipal illinois legacy

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. Source, and how to suggest an edit.

Interconnection

Peering at a glance

Full topology · Graph

Internet exchanges

No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.

Transit providers

3 upstream, 0 downstream and 3 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS33491Comcast Cable Communications, LLC116
AS13335Cloudflare, Inc.62
AS7018AT&T Enterprises, LLC6

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-07, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.

Address space

Summary

Shape and geography

IPv4 3 prefixes · 768 addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America3

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS20315
Registry name
MCHENRY-COUNTY-AS1
Registrant
McHenry County
Abuse contact
infotech@co.mchenry.il.us
Registered
2007-09-06
Last changed
2012-03-20
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 3 with no ROA
ROAs
0 authorising AS20315
ASPA
no ASPA record
IRR
100% registered · 3 of 3 announcements
Route objects
4 naming AS20315

Reputation

Classification and threat

Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.

Spamhaus DROP

Not on ASN-DROP The network as a whole is not listed.

No DROP prefixes None of its announced space is on the DROP prefix list.

Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 454 networks and 1,852 prefixes, as published 2026-11-08. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.

FBI IC3

No IC3 indicators Nothing from the FBI IC3 feed.

IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.

Elsewhere

Cross-check