AS10801 — REGIONS-ASN-1
AS10801 announces 15 IPv4 prefixes covering 23,808 addresses and 0 IPv6 prefixes.
About this network
REGIONS-ASN-1 is the network of Regions Financial Corporation, the Birmingham, Alabama bank holding company behind Regions Bank, a large retail and commercial bank across the US South and Midwest. RIS sees 29 IPv4 prefixes carrying 23,808 addresses, no IPv6, and 3 observed neighbours.
What it's used for
Regions' own internet edge. The announcement set is unusually clean for a bank: essentially all of it comes out of 205.255.0.0/16, announced as one /19 (205.255.224.0/19) plus a long series of /22s and the /23s they split into. This is the bank's public infrastructure — online and mobile banking, branch and ATM backhaul, mail, partner and payment-network links, remote access — and none of it is resold.
Notable
Three neighbours against nearly 24,000 addresses is the classic enterprise fingerprint, and it is the number that settles the classification. A network this size that was in the transit business would peer with hundreds of ASes. Regions buys from a small number of upstreams for redundancy and carries nobody else's traffic. As with most US banks in this range, the entire footprint is IPv4; there is no IPv6 announcement at all.
Interesting
The deaggregation pattern is a traffic-engineering habit rather than a necessity. Announcing 205.255.100.0/22 and 205.255.100.0/23 together, or 205.255.24.0/22 alongside 205.255.24.0/23, adds nothing to reachability. It exists so specific sites can be steered onto specific upstreams, or so a scrubbing provider can pull a piece of the space during an attack without moving the whole aggregate.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.
Announced prefixes
- 205.255.20.0/22
- 205.255.24.0/22
- 205.255.32.0/22
- 205.255.40.0/21
- 205.255.48.0/21
- 205.255.56.0/23
- 205.255.60.0/22
- 205.255.64.0/22
- 205.255.80.0/22
- 205.255.100.0/22
- 205.255.104.0/21
- 205.255.116.0/23
- 205.255.118.0/24
- 205.255.128.0/22
- 205.255.224.0/19
Upstream networks
Adjacent networks
awaiting query
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