AS9183 — CIAFS3
AS9183 announces 5 IPv4 prefixes covering 67,584 addresses and 11 IPv6 prefixes.
About this network
AS9183 (CIAFS3) is held by Robert Bosch GmbH, the Stuttgart-based engineering and technology group. The handle is an internal Bosch department code, not a company name — nothing about CIAFS3 tells you who this is, but the registry, the address space and the reverse DNS all agree. The AS is Bosch's corporate internet-access network.
What it's used for
This is a large enterprise network, and its shape is unmistakable. RIS sees 264 IPv4 prefixes covering 67,584 addresses, plus one IPv6 /32 (2a03:cc00::/32) — and only 2 observed BGP neighbours. That combination is the tell. A carrier holding 67k addresses would peer with hundreds of networks; two neighbours means Bosch buys transit from a small number of upstreams and announces its own space to them. It is a consumer of internet connectivity at very large scale, not a supplier of it.
The 264 prefixes are almost entirely /24s carved out of 139.15.0.0/16, Bosch's own legacy /16. Deaggregating a /16 into individual /24s is a well-known corporate pattern: a globally distributed company with sites, plants and regional egress points on several continents announces each site's block separately so traffic can be steered to the nearest exit and so a single site's space can be withdrawn without touching the rest.
Sampled reverse DNS lands on gwr3.fe.bosch.de — a gateway router under Bosch's own domain, exactly what you would expect at the edge of a corporate WAN.
Notable
- The AS exists to provide global internet access for Bosch worldwide; the registry contact sits in Stuttgart.
- 264 prefixes from essentially one /16 makes this AS a noticeable contributor to routing-table deaggregation for its size.
- The handle CIAFS3 is a good example of why an AS name is never evidence of identity.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.
Announced prefixes
- 139.15.0.0/16
- 185.112.176.0/22
- 193.108.217.0/24
- 193.141.57.0/24
- 194.39.218.0/23
- 2a03:cc00::/36
- 2a03:cc00:fc1::/48
- 2a03:cc00:fc2::/47
- 2a03:cc00:fc4::/46
- 2a03:cc00:fc8::/45
- 2a03:cc00:fd0::/44
- 2a03:cc00:fe0::/43
- 2a03:cc00:1000::/36
- 2a03:cc00:2000::/35
- 2a03:cc00:4000::/34
- 2a03:cc00:8000::/33
Upstream networks
Adjacent networks
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