AS15212 C-SPIRE-WIRELESS - C Spire

The netnames still carry the brand this carrier retired, numbered by era.

What it's used for

• A regional mobile carrier. Fifteen IPv4 prefixes announced from the United States, no IPv6, and twenty-six thousand addresses.

Notable

• Most blocks carry the carrier's former brand as their netname, in three variants distinguished only by a trailing number, so the records group by the era in which each batch of space arrived.
• One block uses the current brand instead, followed by the block written out with its prefix length.
• The registrant is the current name throughout, spelled in two different capitalisations.
• Fourteen of eighteen sampled addresses answered, twelve of them a generic host prefix plus the address under one domain, and two under a second domain with a data-service marker in the label.
• Only one BGP neighbour is observed for all fifteen prefixes.

Interesting

• Three numbered variants of a retired brand is a timeline written into a field nobody treats as one. Each variant marks a separate request to the registry, and together they show the network growing under a name the company no longer uses.
• Two reverse domains on one carrier usually means two platforms. The generic names cover subscriber addresses; the marked ones sit on something else, and the label says which without saying what.
• Fifteen prefixes and one observed upstream is the profile of a carrier whose routes reach the collectors through a single wholesale relationship, which says more about measurement than about how many providers it actually buys from.