AS14263 — SD-NET

AS14263 announces 21 IPv4 prefixes covering 27,904 addresses and 1 IPv6 prefixes.

About this network

A state network that also routes a city and a university, with one netname that records a system already described as old.

What it's used for

• A state government's network. 29,184 addresses across 22 IPv4 prefixes plus one IPv6 prefix, 2607:f578::/32, with ten observed BGP neighbours.

Notable

• Most blocks carry DDNNET-BLK-1 or DDNNET-BLK-2, registered to South Dakota State Government.
• 206.176.32.0/22 carries SDNET-CITY-SF-1, registered to City of Sioux Falls.
• Two blocks are registered to Black Hills State University, one as DDN-BHSU-1 and the other as SDNET-BHSU-OLD-SDLN.
• Eighteen addresses were queried for reverse DNS and none returned a name.
• The prefixes descend from a /18 through /21s, /22s and /23s to eight separate /24s.

Interesting

• A netname containing the word old is a note to a future administrator. Whatever the acronym at the end stood for, somebody wanted the record to say this block predates the current arrangement, and the registry is the only place that comment could live.
• State networks in sparsely populated places tend to become everybody's network. A city hall and a university sitting inside the same announced space is cheaper than each buying transit alone, and the registry is where the shared arrangement becomes visible.
• Ten neighbours is unusually well connected for this size. Carrying other institutions means carrying their peering requirements too.
• Eight single /24s at the bottom of the plan are almost certainly individual agencies or remote sites, each small enough that anything larger would be waste.

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

Announced prefixes

• 206.71.33.0/24
• 206.71.34.0/23
• 206.71.36.0/22
• 206.71.40.0/21
• 206.176.16.0/23
• 206.176.22.0/23
• 206.176.25.0/24
• 206.176.26.0/23
• 206.176.28.0/22
• 206.176.37.0/24
• 206.176.38.0/24
• 206.176.43.0/24
• 206.176.45.0/24
• 206.176.46.0/23
• 206.176.48.0/22
• 206.176.52.0/23
• 206.176.55.0/24
• 206.176.56.0/24
• 206.176.59.0/24
• 206.176.60.0/22
• 206.176.64.0/18
• 2607:f578::/32

Upstream networks

• AS11232 Midcontinent Communications

Downstream networks

• AS11736 University of South Dakota
• AS22215 Black Hills State University
• AS11602 South Dakota School of Mines & Technology
• AS33189 South Dakota Board of Regents
• AS22851 Northern State University
• AS7773 South Dakota State Government
• AS26498 Sanford Underground Laboratory at Homestake
• AS11480 City of Sioux Falls
• AS11607 South Dakota State University
• AS23122 Dakota State University

Adjacent networks

• AS11232 Midcontinent Communications
• AS11736 University of South Dakota
• AS22215 Black Hills State University
• AS11602 South Dakota School of Mines & Technology
• AS33189 South Dakota Board of Regents
• AS22851 Northern State University
• AS7773 South Dakota State Government
• AS26498 Sanford Underground Laboratory at Homestake
• AS11480 City of Sioux Falls
• AS11607 South Dakota State University
• AS23122 Dakota State University