AS4891 Port of Houston Authority of Harris County, Texas

PORTO-18-4891 - Port of Houston Authority of Harris County, Texas · registered in the United States

IPv4 addresses2561 prefixes · <0.001% of announced IPv4

Rank in United States#13,697largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#63,040of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS4891 in ASN lookup Look up an IP in this network (206.130.4.1) All networks in United States

IPv4 prefixes

All 1 prefix, in address order.

206.130.4.0/24

Similar-sized networks in United States

ASNNameIPv4 addresses

AS4887#13694 PORTOFCC - Port of Corpus Christi Authority256

AS4888#13695 USPSOIG-AS1 - United States Postal Service Office of Inspector General256

AS4890#13696 ASN-RICHLINE-FL - Richline Group Inc256

AS4893#13698 RGM-ASN-1 - DRW Holdings, LLC256

AS4902#13699 CI-CCASN - CONSERVATION INTERNATIONAL FOUNDATION256

AS4923#13700 AS-SCF-DC - SCF256

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