AS11055 MIDCONTINENT-COMMUNICATIONS

MIDCONTINENT-COMMUNICATIONS belongs to Midcontinent Communications — Midco, the cable and broadband operator serving South Dakota, North Dakota, Minnesota, Wisconsin and Kansas from its Sioux Falls headquarters. This particular AS is only a sliver of the company's network: three /24s (768 IPv4 addresses), sixteen IPv6 /48s, and a single observed BGP neighbour.

What it's used for

The reverse DNS says plainly what the space carries. Sampled addresses resolve as 66-45-139-5-dynamic.midco.net and 96-2-233-5-static.midco.net — dynamically assigned cable subscribers and statically assigned business or fixed customers, all under Midco's own domain. This is eyeball access space: home broadband and small-business connections on Midco's cable plant, addressed and named by the operator itself.

Notable

Midco routes the bulk of its network through other ASNs; what is visible here is a small set of blocks with one upstream neighbour. So the address count on this AS badly understates the operator — a reader who took 768 addresses at face value would conclude Midco was a tiny provider, when in fact this is one of the larger independent cable operators in the upper Midwest. It is a useful reminder that an AS is a routing object, not a company: a single operator can spread its space over several ASNs.

Interesting

The prefix registrants come back as raw NET-… handles rather than a named org, which happens when the RDAP record resolves to the parent allocation rather than a downstream customer assignment. It is not a third-party registration and carries no leasing implication; the first-party midco.net reverse DNS on every sampled address settles who runs the space.