asn.dev

Autonomous system

AS3374 MCI-ASN

Unclassified ARIN

IPv4 addresses 6.14K 2 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 1 0 downstream
Flagged prefixes 0 none

Summary

Verizon Business (MCI)

United States · AI-generated

enterprise legacy

A legacy MCI autonomous system (MCI-ASN) held by Verizon Business, originating a small amount of the address space Verizon inherited from MCI.

What it's used for

  • Announcing a couple of long-standing blocks within the Verizon Business network.

Notable

  • Carrier address space, small enough that it functions as a corner of Verizon's network rather than a service platform in its own right.
  • Part of the MCI-ASN family registered in 1994 and inherited by Verizon in 2006; see also AS3369, AS3371, AS3372 and AS3373.

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

1 upstream, 0 downstream and 1 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS3371Verizon Business118

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-27, 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 2 prefixes · 6.14K addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America2

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS3369
Registry name
MCI-ASN
Registrant
Verizon Business
Abuse contact
abuse@verizon.com
Registered
1994-01-06
Last changed
2024-07-02
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
0% valid · 0 valid, 2 with no ROA
ROAs
0 authorising AS3374
ASPA
no ASPA record
IRR
0% registered · 0 of 2 announcements
Route objects
0 naming AS3374

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: 447 networks and 1,852 prefixes, as published 2026-10-27. 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