AS54121

Name: AS54121 — David M. Schwarz Architects, Inc.
Creator: ipdex

David M. Schwarz Architects, Inc. Unknown registered in United States

1IPv4 prefixes

0IPv6 prefixes

100%RPKI-valid

#38,161AS Rank

326/326RIS visibility

#12,338Rank in United States

2011-10-07Allocated

David M. Schwarz Architects, Inc. (AS54121) — Unknown, registered in United States. announces 1 IPv4 prefixes + 0 IPv6 prefixes. Rank in United States: #12338. Allocated: 2011-10-07.

IPv4 1IPv6 0

Announced prefixes · 1

v4 205.157.136.0/24 valid

RPKI: rpki.cloudflare.com · 2026-06-17

Routing: 1 IPv4 · 0 IPv6 announced · RIS visibility 326/326 RIS peers · RIPEstat · 2026-06-17

Prefix history

Announced prefixes Source: ipdex daily snapshot · sparse rows, value holds until the next change (steps)

Data table

Day	Announced prefixes
2026-06-12	1
2026-06-13	1

AS topology · Customer cone 1

Providers · 1

AS3356 Level 3 Parent, LLC

Peers · 1

AS1000 LINK AMERICAN

Embed this on your site

Free badges and live charts — they update as the index does. No key, link back to ipdex.

Badge

Markdown

[![AS54121 on ipdex](https://ipdex.io/badge/asn/54121.svg)](https://ipdex.io/asn/AS54121/)

HTML

<a href="https://ipdex.io/asn/AS54121/"><img src="https://ipdex.io/badge/asn/54121.svg" alt="AS54121 on ipdex"></a>

Live chart (iframe)

<iframe src="https://ipdex.io/embed/asn/54121" width="680" height="260" frameborder="0" scrolling="no" title="ipdex chart" style="border:0;max-width:100%"></iframe>

oEmbed-enabled: paste the page URL into platforms that support oEmbed and the chart embeds automatically.