AS11951 MCSP - Medical Computer Systems

🇺🇸

ARINassigned

Announced Prefixes (BGP)

11total

11 IPv40 IPv6

IPv4 Addresses

Allocated (RIR)29,184

Announced (BGP)38,912

IPv6 Addresses

Allocated (RIR)0

Announced (BGP)0

Prefix Limit (IPv4)

Prefix Limit (IPv6)

Country

RIR

Status

assigned

Allocated

1999-02-12

Announced Prefixes

(BGP)11

Prefix	RPKI	IRR	Last Seen
66.186.128.0/20	No ROA	Other IRR	2026-10-11
66.186.129.0/24	No ROA	-	2026-10-11
204.152.42.0/23	No ROA	Other IRR	2026-10-11
204.152.42.0/24	No ROA	-	2026-10-11
204.152.43.0/24	No ROA	-	2026-10-11
205.147.160.0/19	No ROA	Other IRR	2026-10-11
207.152.128.0/18	No ROA	Other IRR	2026-10-11
207.152.134.0/24	No ROA	-	2026-10-11
207.152.135.0/24	No ROA	-	2026-10-11
209.50.192.0/19	No ROA	Other IRR	2026-10-11

1-10 of 11

1 / 2

(RIR)4

Prefix	Country	RIR	Status
66.186.128.0/20	🇺🇸 US	ARIN	allocated
204.152.42.0/23	🇺🇸 US	ARIN	allocated
207.152.128.0/18	🇺🇸 US	ARIN	allocated
209.50.192.0/19	🇺🇸 US	ARIN	allocated

(seen in AS paths)

Networks AS11951 hands its own prefixes to: transit providers, or peers at an exchange.

ASPA

No ASPA

External Links

What is an ASN?Autonomous systems, ASN ranges and how they are assigned
RPKI and route origin validationWhat the RPKI badges on the prefix list mean
ASPA explainedWhy AS11951 should publish an ASPA object
IPv4 transfers in the ARIN regionMonthly volume and the latest registry transfers
ASN data in AI agents and SIEMMCP server and API integrations

API

Returns ASN details, announced prefixes, and BGP routing data.

curl -s "https://api.ipctl.io/v1/asn/11951" | jq