ASN Lookup Tool

Montefiore Medical Center montefiore.org US US 4 Routes

AS Data

AS21821

AS21821 – Montefiore Medical Center

AS Number 21821
AS Name MMAHS-01
Organization Montefiore Medical Center(mmc-125)
Country US
Website montefiore.org
Number of IPv4 Routes 4
Number of IPv6 Routes 0
ASN type BUSINESS
Registry ARIN
Date Allocated 2017-04-03

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Use ASN data for AS21821 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route # IPs
216.255.101.0/24 256
144.121.104.0/24 256
216.255.100.0/24 256
144.121.102.0/24 256

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:       21821
ASName:         MMAHS-01
ASHandle:       AS21821
RegDate:        2017-04-03
Updated:        2017-04-03    
Ref:            https://rdap.arin.net/registry/autnum/21821


OrgName:        Montefiore Medical Center
OrgId:          MMC-125
Address:        1 Fordham Plaza
City:           Bronx
StateProv:      NY
PostalCode:     10458
Country:        US
RegDate:        2001-06-26
Updated:        2021-04-02
Ref:            https://rdap.arin.net/registry/entity/MMC-125


OrgNOCHandle: NCC46-ARIN
OrgNOCName:   NCC
OrgNOCPhone:  +1-914-457-6700 
OrgNOCEmail:  ncc@montefiore.org
OrgNOCRef:    https://rdap.arin.net/registry/entity/NCC46-ARIN

OrgTechHandle: NCC46-ARIN
OrgTechName:   NCC
OrgTechPhone:  +1-914-457-6700 
OrgTechEmail:  ncc@montefiore.org
OrgTechRef:    https://rdap.arin.net/registry/entity/NCC46-ARIN

OrgAbuseHandle: NCC46-ARIN
OrgAbuseName:   NCC
OrgAbusePhone:  +1-914-457-6700 
OrgAbuseEmail:  ncc@montefiore.org
OrgAbuseRef:    https://rdap.arin.net/registry/entity/NCC46-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
AS46887 Crown Castle Fiber LLC US
AS54004 Cablevision Lightpath LLC US
AS32787 Akamai Technologies, Inc. US

Upstreams

AS Number Description Country
AS46887 Crown Castle Fiber LLC US
AS54004 Cablevision Lightpath LLC US
AS32787 Akamai Technologies, Inc. US

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Frequently Asked Questions

ASN AS21821 is an Autonomous System Number used to identify a network for BGP internet routing.
AS21821 is listed under Montefiore Medical Center.
Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.
Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.
WHOIS provides registration and contact context for ASN ownership, administration, and operational reference.
This page previews large ASN datasets. Use See more to load additional rows, and upgrade your plan to view complete peer, route, upstream, and downstream data.