asn.dev

Autonomous system

AS29900 GTMCNET

Unclassified ARIN

IPv4 addresses 8.70K 4 prefixes
IPv6 prefixes 1 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 2 1 downstream
Flagged prefixes 0 none

Summary

Glenwood Telephone Membership Corporation

United States of America · AI-generated

isp residential business us

The AS handle GTMCNET is operated by Glenwood Telephone Membership Corporation.

What it's used for

  • The address space carries residential and business internet access, evidenced by netnames GTMC-ISP and SIN and reverse DNS entries like 66-146-251-254.gtmc.net.
  • The AS announces 8,704 IPv4 addresses across 4 prefixes and 1 IPv6 prefix, with only 3 observed neighbours, indicating a local access network rather than a transit provider.

Notable

  • Registrants for all announced prefixes are consistent with the announcer, listing GLENWOOD TELEPHONE MEMBERSHIP CORPORATION or THE GLENWOOD TELEPHONE MEMBERSHIP CORPORATION.
  • The address inventory consists of two /20 blocks and two /24 blocks, all within the United States.

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, 1 downstream and 4 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS6939Hurricane Electric LLC250
AS13807Great Plains Communications LLC45

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-26, 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 4 prefixes · 8.70K addresses IPv6 1 prefixes

CountryNamePrefixes
USUnited States of America5

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS29900
Registry name
GTMCNET
Registrant
GLENWOOD TELEPHONE MEMBERSHIP CORPORATION
Abuse contact
abuse@glenwoodtelco.net
Registered
2003-06-03
Last changed
2020-07-16
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
80% valid · 4 valid, 1 with no ROA
ROAs
5 authorising AS29900
ASPA
no ASPA record
IRR
100% registered · 5 of 5 announcements
Route objects
6 naming AS29900

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: 443 networks and 1,779 prefixes, as published 2026-10-24. 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