AS13541 — SIEMENS-DISW-WIV-B-ORW
AS13541 announces 7 IPv4 prefixes covering 198,656 addresses and 1 IPv6 prefixes.
About this network
Eight IPv6 prefixes at eight different lengths, which is what an aggregate with one hole punched in it looks like.
What it's used for
- An engineering software company's network. 198,656 addresses across seven IPv4 prefixes, eight IPv6 prefixes, and two observed BGP neighbours.
Notable
- The IPv6 announcements run 2620:107:f000::/41, /42, /43, /44, /45, /46, /47 and /48, each starting where the previous one ends.
- IPv4 netnames include a numbered SIEMENS-DISW series and two that carry their own address, ORW-139-181-12-0-22 and ORW-139-181-17-0-24.
- 192.94.38.0/23 is netname NET192, registrant Various Registries (Maintained by ARIN).
- One prefix's registry lookup failed, so nothing is known about its registration here.
- Eighteen addresses were queried for reverse DNS and none returned a name.
Interesting
- A run of prefixes each half the size of the last, laid end to end, is the minimal way to express one large block with a single small piece removed. Something inside that range is routed elsewhere, and the routing table has to spell out everything except it.
- A registrant naming several registries collectively marks address space older than the current allocation system, sitting in the same table as blocks the company clearly holds itself.
- The ORW prefix reappears in the AS handle, so the letters identify a site or business unit rather than the company.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.
Announced prefixes
- 134.86.0.0/16
- 137.202.0.0/16
- 139.181.12.0/22
- 139.181.17.0/24
- 147.34.0.0/16
- 192.94.36.0/24
- 192.94.38.0/23
- 2620:107:f000::/40
Upstream networks
Adjacent networks
BGP / ASN / CIDR
awaiting query
enter an AS number, IP address, or organisation name above
IPv4
resolving...
IPv6
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Search Results
IPv4 Prefixes
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IPv6 Prefixes
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Total Prefixes
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Unique /24s
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⚠ SUSPICIOUS PREFIX ANNOUNCEMENTS DETECTED