ASN AS11951 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS11951?

AS11951 is listed under Medical Computer Systems.

What do peers, upstreams, and downstreams mean in ASN data?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access the full ASN tables?

The page shows a preview of large ASN datasets. Use the page controls to load more rows, and upgrade to a paid plan for complete access.

AS11951 Medical Computer Systems

ASN Lookup Tool

Medical Computer Systems mcsp.com

US 11 Routes

AS Data

AS11951

AS11951 – Medical Computer Systems

AS Number	11951
AS Name	MCSP
Organization	Medical Computer Systems(mdcs)
Country	US
Website	mcsp.com
Number of IPv4 Routes	11
Number of IPv6 Routes	0
ASN type	BUSINESS
Registry	ARIN
Date Allocated	1999-02-12

ASN Intelligence API for production workflows

Use ASN data for AS11951 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

Access complete peers, upstreams, downstreams, routes, WHOIS, and contact intelligence via our API. Learn more

Get ASN API Key ASN API Docs

IP Ranges

Route	Origin	Origin Name	ISP	# IPs
205.147.160.0/19	AS11951	Medical Computer Systems	Sytex Access Ltd.	8192
66.186.129.0/24	AS11951	Medical Computer Systems	Lan2Wan, Inc.	256
207.152.135.0/24	AS11951	Medical Computer Systems	MAI Network Services	256
209.50.193.0/24	AS11951	Medical Computer Systems	Medical Computer Systems	256
204.152.42.0/23	AS11951	Medical Computer Systems	Management Analsysis, Inc.	512
207.152.128.0/18	AS11951	Medical Computer Systems	MAI Network Services	16384
204.152.42.0/24	AS11951	Medical Computer Systems	Management Analsysis, Inc.	256
207.152.134.0/24	AS11951	Medical Computer Systems	MAI Network Services	256
204.152.43.0/24	AS11951	Medical Computer Systems	Management Analsysis, Inc.	256
209.50.192.0/19	AS11951	Medical Computer Systems	Medical Computer Systems	8192

Raw Whois Response

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#


ASNumber:       11951
ASName:         MCSP
ASHandle:       AS11951
RegDate:        1999-02-12
Updated:        2021-07-14    
Ref:            https://rdap.arin.net/registry/autnum/11951


OrgName:        Medical Computer Systems
OrgId:          MDCS
Address:        1729 21st Street, NW
City:           Washington
StateProv:      DC
PostalCode:     20009
Country:        US
RegDate:        1997-04-04
Updated:        2011-09-24
Ref:            https://rdap.arin.net/registry/entity/MDCS


OrgTechHandle: PW25-ARIN
OrgTechName:   Wolotsky, Paul 
OrgTechPhone:  +1-949-365-1249 
OrgTechEmail:  pdw@mcsp.com
OrgTechRef:    https://rdap.arin.net/registry/entity/PW25-ARIN

OrgAbuseHandle: PW25-ARIN
OrgAbuseName:   Wolotsky, Paul 
OrgAbusePhone:  +1-949-365-1249 
OrgAbuseEmail:  pdw@mcsp.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/PW25-ARIN

RAbuseHandle: PW25-ARIN
RAbuseName:   Wolotsky, Paul 
RAbusePhone:  +1-949-365-1249 
RAbuseEmail:  pdw@mcsp.com
RAbuseRef:    https://rdap.arin.net/registry/entity/PW25-ARIN

RNOCHandle: PW25-ARIN
RNOCName:   Wolotsky, Paul 
RNOCPhone:  +1-949-365-1249 
RNOCEmail:  pdw@mcsp.com
RNOCRef:    https://rdap.arin.net/registry/entity/PW25-ARIN

RTechHandle: PW25-ARIN
RTechName:   Wolotsky, Paul 
RTechPhone:  +1-949-365-1249 
RTechEmail:  pdw@mcsp.com
RTechRef:    https://rdap.arin.net/registry/entity/PW25-ARIN


#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
#

Parsed Whois Response

Peers

AS Number	Description	Country
AS1239	Cogent Communications, LLC	US
AS174	Cogent Communications, LLC	US
AS33657	Comcast Cable Communications, LLC	US

Upstreams

AS Number	Description	Country
AS174	Cogent Communications, LLC	US
AS33657	Comcast Cable Communications, LLC	US