HTTPfy

AS16399 First Communications LLC

FIRSTCOMM-AS2 - First Communications LLC · registered in the United States

IPv4 addresses126,97639 prefixes · 0.004% of announced IPv4
Rank in United States#563largest network in US by IPv4 space, of 18,338 · <0.01% of US
Rank worldwide#1,645of 79,396 networks with IPv4
IPv628,672 x /483 prefixes
CountryUnited States18,679 ASNs registered there
Open AS16399 in ASN lookup Look up an IP in this network (64.27.128.1) All networks in United States

IPv4 prefixes

All 39 prefixes, in address order.

  • 64.27.128.0/19
  • 66.244.160.0/19
  • 67.206.64.0/23
  • 67.206.67.0/24
  • 67.206.68.0/22
  • 67.206.72.0/21
  • 67.206.80.0/20
  • 69.7.192.0/22
  • 69.7.196.0/23
  • 69.7.198.0/23
  • 69.7.200.0/21
  • 69.7.208.0/20
  • 74.222.32.0/19
  • 168.92.0.0/23
  • 168.92.2.0/24
  • 168.92.4.0/22
  • 168.92.8.0/21
  • 168.92.16.0/20
  • 168.93.64.0/21
  • 168.93.72.0/22
  • 168.93.76.0/24
  • 168.93.77.0/24
  • 168.93.78.0/23
  • 168.93.80.0/20
  • 168.93.96.0/19
  • 168.93.128.0/18
  • 207.135.160.0/19
  • 209.45.176.0/24
  • 209.170.160.0/20
  • 216.21.32.0/19
  • 216.126.206.0/24
  • 216.130.96.0/19
  • 216.146.64.0/19
  • 216.159.224.0/22
  • 216.159.228.0/23
  • 216.159.230.0/24
  • 216.159.231.0/24
  • 216.159.232.0/21
  • 216.159.240.0/20

IPv6 prefixes

All 3 prefixes.

  • 2606:7d80:1000::/36
  • 2606:7d80:2000::/35
  • 2606:7d80:4000::/34

Other ASNs named First Communications LLC

1 other network uses the same organisation name; together with AS16399 they announce 181,248 IPv4 addresses.

ASNNameIPv4 addresses
AS2707FIRSTCOMM-AS1 - First Communications LLC US54,272

Similar-sized networks in United States

ASNNameIPv4 addresses
AS395959#560 XEROX-ELL - XEROX CORPORATION128,512
AS63911#561 NETACTUATE-AS-AP - NetActuate, Inc128,256
AS396190#562 LEASEWEB-USA-SEA - Leaseweb USA, Inc.127,488
AS29838#564 AMC - Atlantic Metro Communications II, Inc.126,720
AS26801#565 ZITOMEDIA611 - Zito Media, L.P.126,464
AS36183#566 AKAMAI-AS - Akamai Technologies, Inc.125,696

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