AS19977 Mayer Brown LLP

MBRML-AS - Mayer Brown LLP · registered in the United States

IPv4 addresses2,0481 prefixes · <0.001% of announced IPv4

Rank in United States#6,220largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#22,947of 79,396 networks with IPv4

IPv6noneno IPv6 routes announced

CountryUnited States18,679 ASNs registered there

Open AS19977 in ASN lookup Look up an IP in this network (143.58.0.1) All networks in United States

IPv4 prefixes

All 1 prefix, in address order.

143.58.0.0/21

Similar-sized networks in United States

ASNNameIPv4 addresses

AS19730#6217 BMEAS-A00001 - BENCHMARK INTERNET GROUP2,048

AS19890#6218 LONE-PINE-OLANCHA - LONE PINE Communications2,048

AS19923#6219 SHENANDOAH-UNIV - Shenandoah University2,048

AS20038#6221 ALLENTOWNSD - Allentown School District2,048

AS20048#6222 AMA-AS-0001 - American Medical Association2,048

AS20194#6223 BEARTECH - Bear Technologies Corporation2,048

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