AS11961 — MIDRIVERS

Network type: residential

AS11961 announces 5 IPv4 prefixes covering 28,672 addresses and 1 IPv6 prefixes.

About this network

MIDRIVERS is Mid-Rivers Telephone Cooperative, trading as Mid-Rivers Communications — a member-owned rural telco founded in 1952, headquartered in Circle, Montana, serving the sparsely populated eastern half of the state with internet, voice and video.

What it's used for

Subscriber access across a rural footprint. RIS sees seven IPv4 prefixes carrying 28,672 addresses plus one IPv6 /32 (2607:8380::/32), with 13 observed neighbours. Every sampled address answers as a generated per-address PTR under midrivers.com — 72-250-128-5.midrivers.com and so on — which is how a co-op names its customer pools. Address space, naming and neighbour count all point the same way: an eyeball network, not a carrier.

Notable

The inventory is unusually clean. All seven prefixes are registered to Mid-Rivers Telephone Cooperative, Inc itself, and the netnames read like a build history rather than a set of unrelated third parties: MIDRIV, MDRV, CM-MILES, EXPANSION2 and EXPANSIONFIBER — plausibly a cable-modem block for Miles City, one of the co-op's regional offices, alongside successive fibre build-outs. Self-registered prefixes with first-party rDNS on every one of them is the definitive exoneration — this is a real operator running its own space, however piecemeal the blocks look.

Interesting

Thirteen neighbours is a lot for a co-op of this size, and it reflects geography rather than ambition: covering thousands of square miles of eastern Montana means interconnecting wherever fibre reaches, so a rural network can end up better-connected at the edges than its subscriber count would suggest.

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

Announced prefixes

• 64.89.208.0/20
• 72.250.128.0/19
• 108.59.112.0/20
• 144.86.208.0/20
• 216.228.32.0/19
• 2607:8380::/32

Upstream networks

• AS6939 Hurricane Electric LLC
• AS174 Cogent Communications, LLC
• AS2914 NTT America, Inc.
• AS1299 Arelion Sweden AB
• AS394256 Tech Futures Interactive Inc.
• AS24482 SG.GS
• AS3130 RGnet OU
• AS34927 iFog GmbH

Adjacent networks

• AS6939 Hurricane Electric LLC
• AS174 Cogent Communications, LLC
• AS2914 NTT America, Inc.
• AS1299 Arelion Sweden AB
• AS24482 SG.GS
• AS394256 Tech Futures Interactive Inc.
• AS3130 RGnet OU
• AS34927 iFog GmbH

Internet exchanges

• Seattle Internet Exchange — Seattle, United States
• Midwest Internet Cooperative Exchange — Minneapolis, United States
• Interconnection eXchange Denver — Denver, United States