AS21965 Highmark Inc

HIGHMARK - Highmark Inc · registered in the United States

IPv4 addresses5,63216 prefixes · <0.001% of announced IPv4

Rank in United States#3,934largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#12,891of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS21965 in ASN lookup Look up an IP in this network (157.154.3.1) All networks in United States

IPv4 prefixes

All 16 prefixes, in address order.

157.154.3.0/24
157.154.4.0/22
157.154.8.0/24
157.154.11.0/24
157.154.14.0/24
157.154.20.0/24
167.164.3.0/24
167.164.4.0/22
167.164.8.0/24
167.164.11.0/24
167.164.14.0/24
167.164.20.0/24
192.152.123.0/24
199.190.160.0/24
199.190.163.0/24
199.190.164.0/24

Similar-sized networks in United States

ASNNameIPv4 addresses

AS16743#3931 FTSBROADBAND - FTS Broadband5,632

AS17073#3932 ALLEGISGROUP7312 - Allegis Group5,632

AS21734#3933 TRADINGTECH-TTNET - Trading Technologies Intl, Inc.5,632

AS23522#3935 ASN-HRNET - GigeNET5,632

AS25655#3936 OSTK-COM - Overstock.com5,632

AS26395#3937 JOHNSON-CONTROLS - Johnson Controls Inc5,632

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