Autonomous system
AS3372 MCI-ASN
Unclassified ARIN
Summary
Verizon Business (MCI)
enterprise legacy
A legacy MCI autonomous system (MCI-ASN) held by Verizon Business, and the most fragmented of the group: it originates over a hundred separate prefixes of Verizon's inherited address space.
What it's used for
- Announcing many small Verizon Business allocations, largely carved out of the older MCI network blocks.
Notable
- Carrier address space, split into a large number of individual announcements rather than a few big aggregates, which is typical of long-lived enterprise and customer assignments accumulated over decades.
- One of the
MCI-ASNnumbers registered in 1994 and inherited by Verizon in 2006; its siblings are AS3369, AS3371, AS3373 and AS3374.
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, 3 downstream and 5 adjacent networks observed; most-used upstreams first.
| AS | Network | Paths seen |
|---|---|---|
| AS3378 | Verizon Business | 6,342 |
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
IPv4 84 prefixes · 425K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 85 |
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
- 3% valid · 3 valid, 105 with no ROA
- ROAs
- 5 authorising AS3372
- ASPA
- no ASPA record
- IRR
- 3% registered · 3 of 108 announcements
- Route objects
- 5 naming AS3372
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: 446 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