AS398991 X99

X99-US - X99 · registered in the United States

IPv4 addresses11,77620 prefixes · <0.001% of announced IPv4

Rank in United States#2,761largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#8,374of 79,396 networks with IPv4

IPv637,888 x /483 prefixes

CountryUnited States18,679 ASNs registered there

Open AS398991 in ASN lookup Look up an IP in this network (23.231.97.1) All networks in United States

IPv4 prefixes

All 20 prefixes, in address order.

23.231.97.0/24
38.46.142.0/23
38.81.122.0/23
38.99.238.0/23
38.100.202.0/23
38.135.26.0/23
38.183.188.0/23
38.247.68.0/22
130.250.188.0/23
142.99.99.0/24
142.99.102.0/23
184.154.240.0/22
184.154.244.0/23
198.13.16.0/23
199.245.233.0/24
199.245.234.0/24
206.109.56.0/22
208.122.16.0/22
209.14.152.0/23
209.131.120.0/22

IPv6 prefixes

All 3 prefixes.

2607:a540::/33
2607:a540:9000::/36
2607:a540:a000::/38

Similar-sized networks in United States

ASNNameIPv4 addresses

AS35487#2758 MISAKA Misaka Network, Inc.11,776

AS19754#2759 FNL-33-19754 - The Fusion Network, LLC11,776

AS400706#2760 HEART-OF-IOWA-UNION - Heart of Iowa Communications Cooperative11,776

AS400238#2762 PIEG-01 - PIE&G11,776

AS399693#2763 NCN-AS - Northwest Communications11,776

AS29770#2764 THE-INTERNET-SUBWAY - The Internet Subway11,776

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