Data as of Nov 10, 2026
Autonomous system

AS54121

David M. Schwarz Architects, Inc.

Announces 256 addresses in 1 prefixes. None of it is anonymizer space.

Type
Business
US

Announced prefixes

Arrived
PrefixTypeHolderRPKI
205.157.136.0/24
since Dec 2011
BusinessNTT America, Inc.

Network & history

Routing patterns

How its announcements have moved

Arrivals

Year each prefix's current origin began announcing it