Autonomous system
AS1631 AS1631 - Radnet Management, Inc.
Unclassified ARIN
Summary
RadNet Management, Inc.
enterprise legacy
AS1631 belongs to RadNet Management, Inc., the largest US operator of freestanding outpatient diagnostic-imaging (MRI, CT, mammography) centers, headquartered in Los Angeles, California.
What it's used for
- Corporate networking tying together the company's nationwide network of imaging centers.
Notable
- An enterprise / healthcare network, not a commercial ISP or host.
- The low AS number was reassigned to this modern holder rather than held since the early internet.
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.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-13, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 2 prefixes · 1.28K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 2 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS1631- Registry name
- AS1631
- Registrant
- Radnet Management, Inc.
- Abuse contact
- domains@radnet.com
- Registered
- 2021-08-30
- Last changed
- 2021-08-30
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 5 with no ROA
- ROAs
- 0 authorising AS1631
- ASPA
- no ASPA record
- IRR
- 80% registered · 4 of 5 announcements 1 other origin
- Route objects
- 4 naming AS1631
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: 442 networks and 1,773 prefixes, as published 2026-10-13. 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