AS1742 Harvard University

HARVARD-UNIV - Harvard University · registered in the United States

IPv4 addresses203,52031 prefixes · 0.006% of announced IPv4

Rank in United States#315largest network in US by IPv4 space, of 18,338 · 0.01% of US

Rank worldwide#1,065of 79,396 networks with IPv4

IPv61 x /32 (69,633 x /48)16 prefixes

CountryUnited States18,679 ASNs registered there

Open AS1742 in ASN lookup Look up an IP in this network (65.112.0.1) All networks in United States

IPv4 prefixes

All 31 prefixes, in address order.

65.112.0.0/20
67.134.204.0/22
128.103.0.0/16
131.142.0.0/16
140.247.0.0/18
140.247.64.0/19
140.247.96.0/20
140.247.112.0/20
140.247.128.0/20
140.247.144.0/21
140.247.152.0/24
140.247.153.0/24
140.247.154.0/23
140.247.156.0/22
140.247.160.0/21
140.247.168.0/22
140.247.172.0/23
140.247.174.0/24
140.247.175.0/24
140.247.176.0/20
140.247.192.0/19
140.247.224.0/21
140.247.232.0/22
140.247.236.0/24
140.247.237.0/24
140.247.238.0/23
140.247.240.0/20
192.5.66.0/24
192.54.223.0/24
192.131.102.0/24
199.94.60.0/22

IPv6 prefixes

All 16 prefixes.

2602:fca9::/36
2607:fb60::/35
2607:fb60:2000::/38
2607:fb60:2400::/45
2607:fb60:2408::/45
2607:fb60:2410::/44
2607:fb60:2420::/43
2607:fb60:2440::/42
2607:fb60:2480::/41
2607:fb60:2500::/40
2607:fb60:2600::/39
2607:fb60:2800::/37
2607:fb60:3000::/36
2607:fb60:4000::/34
2607:fb60:8000::/33
2620:32:8000::/48

Similar-sized networks in United States

ASNNameIPv4 addresses

AS7270#312 NET2PHONE - IDT Corporation208,128

AS3464#313 ASC-NET - Alabama Supercomputer Authority207,616

AS398823#314 PEG-LA - PEG TECH INC207,104

AS36850#316 UNC-CH - University of North Carolina at Chapel Hill203,264

AS1637#317 DNIC-AS-01637 - Headquarters, USAISC201,728

AS400619#318 AROSS-AS - AROSSCLOUD INC.201,472

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