AS103 Northwestern University

NWU-AS - Northwestern University · registered in the United States

IPv4 addresses149,50422 prefixes · 0.005% of announced IPv4

Rank in United States#412largest network in US by IPv4 space, of 18,338 · 0.01% of US

Rank worldwide#1,333of 79,396 networks with IPv4

IPv6256 x /483 prefixes

CountryUnited States18,679 ASNs registered there

Open AS103 in ASN lookup Look up an IP in this network (8.28.178.1) All networks in United States

IPv4 prefixes

All 22 prefixes, in address order.

8.28.178.0/23
8.30.248.0/22
38.124.97.0/24
129.105.0.0/16
165.124.0.0/17
165.124.128.0/19
165.124.160.0/20
165.124.176.0/21
165.124.184.0/23
165.124.186.0/24
165.124.192.0/19
165.124.224.0/21
165.124.232.0/22
165.124.240.0/20
192.5.143.0/24
192.26.85.0/24
192.26.86.0/23
192.31.253.0/24
199.74.64.0/18
199.249.165.0/24
199.249.166.0/23
199.249.168.0/23

IPv6 prefixes

All 3 prefixes.

2401:eee0:140::/42
2401:eee0:180::/42
2620:10d:2000::/41

Similar-sized networks in United States

ASNNameIPv4 addresses

AS6099#409 BAE-NET-ASN - Alameda County Office of Education151,040

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AS3582#411 UONET - University of Oregon149,504

AS16839#413 SNC - SERVICENOW, INC.148,992

AS63199#414 CDSC-AS1 - CDS Global Cloud Co., Ltd148,736

AS398478#415 PEG-HK - PEG TECH INC147,968

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