asn.dev

Autonomous system

AS20135 MTL-19 - Millennium Telcom LLC

Unclassified ARIN

IPv4 addresses 67.33K 21 prefixes
IPv6 prefixes 2 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 5 5 downstream
Flagged prefixes 0 none

Summary

Millennium Telcom

United States of America · AI-generated

residential fiber isp us

The AS handle MTL-19 is operated by Millennium Telcom LLC.

What it's used for

  • The address space carries residential fiber broadband traffic, evidenced by reverse DNS records pointing to fiberfirstdns.com with state-specific subdomains such as az, tx, ca, and ne.
  • The network announces 67,072 IPv4 addresses across 24 prefixes and 2 IPv6 prefixes, while maintaining only 5 observed routing neighbours, a ratio indicative of an access or eyeball network rather than a transit provider.

Notable

  • Registrants for the largest prefixes include Millennium Telcom LLC, Cogent Communications LLC, and Ubiquity Nebraska LLC, with netnames such as MTL-CGNT-NET-2, COGENT-A, and UNLLC-CGNT-NET-1 reflecting historical acquisitions or space leases.
  • The address inventory is subdivided into numerous /19, /20, and /21 blocks, consistent with a corporate estate segmented by geographic region or service tier.

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

5 upstream, 5 downstream and 12 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS174Cogent Communications, LLC2,018
AS6939Hurricane Electric LLC524
AS6461Zayo Bandwidth119
AS5056Aureon Network Services27
AS46887Crown Castle Fiber LLC21

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-11-13, 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 21 prefixes · 67.33K addresses IPv6 2 prefixes

CountryNamePrefixes
USUnited States of America23

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS20135
Registry name
MTL-19
Registrant
Millennium Telcom LLC
Abuse contact
admin@1scom.com
Registered
2001-03-29
Last changed
2012-03-02
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 46 with no ROA
ROAs
2 authorising AS20135
ASPA
no ASPA record
IRR
61% registered · 28 of 46 announcements
Route objects
13 naming AS20135

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: 455 networks and 1,849 prefixes, as published 2026-11-13. 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