AS21821 Montefiore Medical Center

MMAHS-01 - Montefiore Medical Center · registered in the United States

IPv4 addresses1,0243 prefixes · <0.001% of announced IPv4

Rank in United States#8,283largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#36,667of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS21821 in ASN lookup Look up an IP in this network (144.121.102.1) All networks in United States

IPv4 prefixes

All 3 prefixes, in address order.

144.121.102.0/24
144.121.104.0/24
216.255.100.0/23

Similar-sized networks in United States

ASNNameIPv4 addresses

AS21683#8280 DALKO-NETWORKS - Dalko, LLC1,024

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AS21750#8282 CPOINT-NET-1 - CPOINT1,024

AS21842#8284 PJM - PJM Interconnection LLC.1,024

AS21895#8285 NYLS-AS - New York Law School1,024

AS21913#8286 MAINFREIGHTUS-AS - Mainfreight, Inc.1,024

IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources