Autonomous system
AS3376 MCI-ASN
Unclassified ARIN
Summary
Verizon Business (MCI)
transit isp legacy
One of the legacy MCI autonomous systems (MCI-ASN), inherited by Verizon Business when Verizon acquired MCI. It sits in a block of consecutive MCI ASNs that still ride alongside the main Verizon backbone, AS701.
What it's used for
- Announcing a small set of MCI-era prefixes on behalf of Verizon Business and its customers.
- Not a general-purpose transit ASN in its own right — the heavy lifting is done by AS701.
Notable
- Registered to Verizon Business in Ashburn, Virginia; the ARIN record traces back to the mid-1990s, when MCI ran one of the earliest commercial internet backbones.
- Address space announced here is carrier-assigned, so it typically maps to business customers rather than to Verizon itself.
Interesting
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
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.
| AS | Network | Paths seen |
|---|---|---|
| AS3371 | Verizon Business | 240 |
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-28, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 4 prefixes · 21.50K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 4 |
Registry
Allocation record
- 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
- RPKI
- 0% valid · 0 valid, 4 with no ROA
- ROAs
- 0 authorising AS3376
- ASPA
- no ASPA record
- IRR
- 0% registered · 0 of 4 announcements
- Route objects
- 0 naming AS3376
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: 448 networks and 1,851 prefixes, as published 2026-10-29. 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