AS16681 Educational Testing Service

ETS - Educational Testing Service · registered in the United States

IPv4 addresses2,0487 prefixes · <0.001% of announced IPv4

Rank in United States#6,186largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#22,894of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS16681 in ASN lookup Look up an IP in this network (144.81.10.1) All networks in United States

IPv4 prefixes

All 7 prefixes, in address order.

144.81.10.0/23
144.81.53.0/24
144.81.54.0/24
144.81.85.0/24
144.81.97.0/24
144.81.111.0/24
144.81.127.0/24

Similar-sized networks in United States

ASNNameIPv4 addresses

AS16575#6183 HANOVER-COLLEGE - Hanover College2,048

AS16620#6184 ALCAZAR-EAST - Alcazar Networks, Inc2,048

AS16638#6185 CORNINGINC01 - Corning Incorporated2,048

AS16728#6187 MATTEL - Mattel, Inc.2,048

AS16750#6188 ECPI - Electronic Corporate Pages, Inc2,048

AS16818#6189 SYNTAX-NJ-AZ - Syntax systems Ltd LLC.2,048

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