Autonomous system
AS11951 MCSP
Unclassified ARIN
Summary
MCSP, Inc (Medical Computer Systems)
hosting isp enterprise legacy
MCSP is Medical Computer Systems, trading as MCSP, Inc — a Washington, DC provider that describes itself as an internet, application and managed-services company: fibre and Ethernet access, colocation, hosted mail and voice, backup and cloud applications for small and mid-sized businesses.
What it's used for
A mixed provider estate rather than a single-purpose network. RIS sees 11 prefixes carrying 37,376 addresses behind only two observed neighbours — a lot of address space reached through very few upstreams, which rules out any wholesale role. The reverse DNS shows both halves of the business at once: first-party infrastructure (core1-...wadc.mcsp.net, mcsppnt.mcsp.net, edge1.meva.mcsp.net), shared hosting serving customer sites and mail, and access pools under dsl.lan2wan.com and dialisp.net.
Notable
The prefix registrants look alarming until you read them properly. The blocks belong to MAI Network Services, Sytex Access, Lan2Wan, Management Analysis Inc and MCSP itself — five names, one AS. This is not the IP-leasing shape: everything is in a single registry, the rDNS is first-party throughout, and the holder is a findable business at a real DC address. It reads as a roll-up of small legacy ISPs whose registry records were never renamed, with their subscriber pools still answering under the acquired brands.
Interesting
Blocks here still carry dial-up (dialisp.net) and DSL naming, a working fossil layer beneath the colocation and cloud services the company sells today.
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 2026-10-18, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 12 prefixes · 37.38K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 12 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS11951- Registry name
- MCSP
- Registrant
- Medical Computer Systems
- Abuse contact
- pdw@mcsp.com
- Registered
- 1999-02-12
- Last changed
- 2021-07-14
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 10 with no ROA
- ROAs
- 0 authorising AS11951
- ASPA
- no ASPA record
- IRR
- 100% registered · 10 of 10 announcements
- Route objects
- 12 naming AS11951
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 1,784 prefixes, as published 2026-10-19. 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