AS49 National Institute of Standards and Technology

US-NATIONAL-INSTITUTE-OF-STANDARDS-AND-TECHNOLOGY - National Institute of Standards and Technology · registered in the United States

IPv4 addresses65,53612 prefixes · 0.002% of announced IPv4

Rank in United States#1,013largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#2,921of 79,396 networks with IPv4

IPv62,054 x /485 prefixes

CountryUnited States18,679 ASNs registered there

Open AS49 in ASN lookup Look up an IP in this network (129.6.0.1) All networks in United States

IPv4 prefixes

All 12 prefixes, in address order.

129.6.0.0/19
129.6.32.0/22
129.6.36.0/24
129.6.38.0/23
129.6.40.0/21
129.6.48.0/23
129.6.50.0/24
129.6.52.0/22
129.6.56.0/21
129.6.64.0/18
129.6.128.0/17
132.163.96.0/23

IPv6 prefixes

All 5 prefixes.

2610:20:6000::/37
2610:20:6f15::/48
2610:20:6f96::/47
2610:20:6fcd::/48
2610:20:6fce::/47

Similar-sized networks in United States

ASNNameIPv4 addresses

AS16793#1010 DATA-TRONICS - ArcBest Technologies, Inc.65,536

AS17324#1011 ALNET - Yeshiva University65,536

AS18515#1012 UTARLINGTON - University of Texas at Arlington65,536

AS2496#1014 UKANS - University of Kansas65,536

AS7764#1015 CENSUSBUREAU - National Oceanic and Atmospheric Administration65,536

AS324#1016 DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD)65,536

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