asn.dev

Autonomous system

AS40831 PHS

Unclassified ARIN

IPv4 addresses 197K 11 prefixes
IPv6 prefixes 0 counted as prefixes, not addresses
Countries 1 mostly US
Exchanges 0 recorded by PCH
Upstreams 4 1 downstream
Flagged prefixes 0 none

Summary

Mass General Brigham

United States of America · AI-generated

healthcare enterprise corporate boston

The AS handle PHS is held by Mass General Brigham Incorporated.

What it's used for

  • The address space carries internal corporate infrastructure for a major healthcare system, evidenced by netnames MGH-ETHER (Massachusetts General Hospital), DFCINET (Dana-Farber Cancer Institute), and PHCS-B (Mass General Brigham Incorporated).
  • The inventory consists of 11 IPv4 prefixes totaling 196,864 addresses, with a low neighbour count of 5, indicating a self-contained internal estate rather than a transit or access network.
  • Traffic from this AS represents internal communications, clinical systems, and administrative endpoints for the integrated health system's campuses and research facilities.

Notable

  • Registrants align with the announcer, including Massachusetts General Hospital, Dana-Farber Cancer Institute, Mass General Brigham Incorporated, and Partners Healthcare.
  • Mass General Brigham was formerly known as Partners HealthCare, a rename that explains the presence of the PHS handle and Partners Healthcare registrant entries.
  • The address inventory is finely subdivided, with the 170.223.0.0/17 block split into multiple smaller prefixes, reflecting site-by-site segmentation within the corporate estate.

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

4 upstream, 1 downstream and 5 adjacent networks observed; most-used upstreams first.

ASNetworkPaths seen
AS40127Longwood Medical and Academic Area (LMA)189
AS46887Crown Castle Fiber LLC60
AS49915Megaport (UK) Limited59
AS7015Comcast Cable Communications, LLC1

Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-31, 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 11 prefixes · 197K addresses IPv6 0 prefixes

CountryNamePrefixes
USUnited States of America11

Registry

Allocation record

ARIN · via Atlas (registry + RDAP)
Registry
ARIN
Handle
AS40831
Registry name
PHS
Registrant
Mass General Brigham Incorporated
Abuse contact
tmccann@mgb.org
Registered
2017-07-25
Last changed
2017-07-25
Allocation
assigned

Routing security

RPKI and IRR

Full detail
RPKI
33% valid · 2 valid, 4 with no ROA
ROAs
2 authorising AS40831
ASPA
no ASPA record
IRR
100% registered · 6 of 6 announcements
Route objects
7 naming AS40831

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 1,845 prefixes, as published 2026-10-31. 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