asn.dev

Autonomous system

AS15099 MONROE-COUNTY-MI-PUBLIC-ASN

Unclassified ARIN

IPv4 addresses 256 1 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 2 0 downstream
Flagged prefixes 0 none

Summary

County of Monroe

United States · AI-generated

government business

The longest AS handle in this stretch, and it explains itself.

What it's used for

  • A county government's network. One IPv4 /24 announced from the United States, no IPv6, and two observed BGP neighbours.

Notable

  • The AS handle is MONROE-COUNTY-MI-PUBLIC-ASN: the organisation, a two-letter state abbreviation, the word PUBLIC and the word ASN all inside a field that only has to be unique.
  • The announced block is not the county's. It carries the netname CCCH3-4 and is registered to a cable carrier.
  • That netname turns up on unrelated holders elsewhere in this corpus, so it is a bulk category the carrier applies rather than anything specific to this customer.
  • Three addresses were queried for reverse DNS and none returned a name.

Interesting

  • A government running its own AS number over a carrier's addresses is the ordinary arrangement for a body this size. The county controls the routing so it can change providers without renumbering, and the addresses stay with whoever it buys transit from today.
  • Spelling ASN inside an AS handle is a habit several holders in this range share. It is redundant in the field it sits in and it is the kind of redundancy that survives forever, because nobody edits a handle once systems reference it.
  • The word PUBLIC implies a matching private network that has no reason to appear in routing at all.

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

2 upstream, 0 downstream and 2 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS237Merit Network Inc.56
AS33668Comcast Cable Communications, LLC3

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-22, 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 1 prefixes · 256 addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America1

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS15099
Registry name
MONROE-COUNTY-MI-PUBLIC-ASN
Registrant
County of Monroe
Abuse contact
jacob_perry@monroemi.org
Registered
2017-09-11
Last changed
2017-09-11
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
100% valid · 1 valid, 0 with no ROA
ROAs
1 authorising AS15099
ASPA
no ASPA record
IRR
100% registered · 1 of 1 announcements
Route objects
1 naming AS15099

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: 442 networks and 1,779 prefixes, as published 2026-10-23. 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