AS5774 United States Postal Service

USPS-001 - United States Postal Service · registered in the United States

IPv4 addresses196,60838 prefixes · 0.006% of announced IPv4

Rank in United States#336largest network in US by IPv4 space, of 18,338 · 0.01% of US

Rank worldwide#1,114of 79,396 networks with IPv4

IPv61 x /32 (65,536 x /48)2 prefixes

CountryUnited States18,679 ASNs registered there

Open AS5774 in ASN lookup Look up an IP in this network (56.0.0.1) All networks in United States

IPv4 prefixes

All 38 prefixes, in address order.

56.0.0.0/19
56.0.32.0/20
56.0.48.0/20
56.0.64.0/20
56.0.80.0/21
56.0.88.0/22
56.0.92.0/22
56.0.96.0/21
56.0.104.0/21
56.0.112.0/20
56.0.128.0/20
56.0.144.0/23
56.0.146.0/24
56.0.147.0/24
56.0.148.0/22
56.0.152.0/22
56.0.156.0/22
56.0.160.0/19
56.0.192.0/18
56.105.0.0/18
56.105.64.0/23
56.105.66.0/23
56.105.68.0/22
56.105.72.0/21
56.105.80.0/22
56.105.84.0/23
56.105.86.0/23
56.105.88.0/21
56.105.96.0/20
56.105.112.0/21
56.105.120.0/22
56.105.124.0/22
56.105.128.0/19
56.105.160.0/21
56.105.168.0/21
56.105.176.0/20
56.105.192.0/18
56.235.0.0/16

IPv6 prefixes

All 2 prefixes.

2610:68::/33
2610:68:8000::/33

Similar-sized networks in United States

ASNNameIPv4 addresses

AS1999#333 HOUSE-AS-1 - U.S. House of Representatives197,376

AS1600#334 DNIC-ASBLK-01550-01601 - United States Department of Defense (DoD)197,120

AS40831#335 PHS - Mass General Brigham Incorporated196,864

AS331#337 DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD)196,608

AS335#338 DNIC-ASBLK-00306-00371 - United States Department of Defense (DoD)196,608

AS22390#339 XEROX-WB - XEROX CORPORATION196,608

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