Autonomous system
AS12129 123NET
Hosting ARIN NSP
Summary
123NET
isp colo transit legacy
123NET is a Michigan network operator running fiber, colocation and transit out of the Detroit metro area.
What it's used for
- Business fiber, dedicated internet access and colocation. The reverse DNS is almost entirely
static.123.net, which is what statically assigned business space looks like rather than a residential access plant.
Notable
- 111 observed BGP neighbours against 164,000 addresses. That inverts the usual eyeball ratio and marks this as a peering-heavy network — an operator whose value is who it connects to, not how many subscribers it holds.
- 123NET runs the Detroit-area internet exchange, which is the direct explanation for a neighbour count that large on a network this size.
Interesting
- Several of the announced blocks are registered to other companies, including
2020 CommunicationsandSectorlink. On a colocation and transit network that is the expected pattern: customers bring their own ARIN assignments and have them announced, so the registry reads as a list of tenants rather than a single owner.
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
Recorded at 3 exchanges in 1 country, largest first.
| Exchange | Location | Their address |
|---|---|---|
| Equinix Internet Exchange Ashburn | Ashburn, United States | 206.126.236.70 |
| Equinix Internet Exchange Chicago | Chicago, United States | 208.115.136.132 |
| Detroit Internet Exchange | Detroit, United States | 209.124.52.123 |
Transit providers
10 upstream, 95 downstream and 137 adjacent networks observed; most-used upstreams first.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-11, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 94 prefixes · 163K addresses IPv6 7 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 101 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS12129- Registry name
- 123NET
- Registrant
- 123.Net, Inc.
- Abuse contact
- rpd@123.net
- Registered
- 1999-03-30
- Last changed
- 2012-03-02
- Allocation
- assigned
Declared
PeeringDB profile
- Name
- 123NET
- Also known as
- 123NET
- Network type
- NSP
- Scope
- North America
- Traffic ratio
- Balanced
- Peering policy
- Open
- IRR as-set
LEVEL3::AS-I123- Present at
- 4 exchanges
- Facilities
- 12 facilities
- Website
- https://www.123.net
PeeringDB records are maintained by the network operator and are not independently verified. Treat them as a statement of intent rather than of fact. For the observed and recorded view, see peering, which lists the exchanges Packet Clearing House has a port on file for.
Routing security
RPKI and IRR
- RPKI
- 69% valid · 36 valid, 16 with no ROA
- ROAs
- 45 authorising AS12129
- ASPA
- no ASPA record
- IRR
- 10% registered · 5 of 52 announcements 5 other origin
- Route objects
- 15 naming AS12129
Reputation
Classification and threat
Hosting Datacenter or cloud provider. Addresses are servers, not people.
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: 431 networks and 1,768 prefixes, as published 2026-10-12. 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