AS12156 — AURORA-COLORADO

AS12156 announces 5 IPv4 prefixes covering 1,536 addresses and 0 IPv6 prefixes.

About this network

The network of Aurora, Colorado, the large suburban city east of Denver.

What it's used for

• Municipal government systems. 1,536 addresses over five prefixes with three observed BGP neighbours, no IPv6 announced.

Notable

• The netnames are numbered in sequence — AURORA-CO1 through AURORA-CO5 — one per application, in the order they were made.
• The registrant name changes partway through the sequence. CO1 and CO2 read "CITY OF AURORA" in capitals; CO3, CO4 and CO5 read "City of Aurora Colorado".
• Reverse DNS answers under ci.aurora.co.us, with names like 198-199-187-64.dia.static.ci.aurora.co.us.

Interesting

• That domain is the interesting survival. ci.<city>.<state>.us was the delegated namespace for US local government, defined when the .us hierarchy was organised geographically and every town was meant to have a place in it. Almost every city abandoned it for .gov or a plain .org, and finding one still publishing reverse DNS under the old form is rare.
• Five sequentially numbered netnames is a small municipal IT department's history in one field. Nobody plans an address space in five instalments; each number is a separate moment when a department, a building or a service needed addresses and someone filed for more.

This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.

Announced prefixes

• 192.78.99.0/24
• 198.148.209.0/24
• 198.199.187.0/24
• 198.199.188.0/24
• 205.167.144.0/23

Upstream networks

• AS33652 Comcast Cable Communications, LLC
• AS209 CenturyLink Communications, LLC
• AS13649 Flexential Colorado Corp.

Adjacent networks

• AS33652 Comcast Cable Communications, LLC
• AS209 CenturyLink Communications, LLC
• AS13649 Flexential Colorado Corp.