AS4181 TDS-AS

TDS-AS is TDS Telecom, the wireline broadband and telephone arm of Telephone

and Data Systems, Inc., headquartered in Madison, Wisconsin.

What it's used for

• Residential and small-business internet access across TDS's service territory, which spans rural and suburban communities in dozens of US states.
• TDS operates as an incumbent local exchange carrier in many of its markets and has been expanding fiber-to-the-home alongside its legacy copper and cable footprint.

Notable

• This is eyeball space. Addresses here overwhelmingly map to home broadband subscribers, so geolocation tends to resolve to small towns and suburbs rather than data centers.
• The allocation is large (over 1.7 million addresses), consistent with a multi-state consumer ISP that needs a public address per subscriber line.

Interesting

• TDS is one of the larger US broadband providers that most people outside its footprint have never heard of, because it grew by serving markets the big national carriers skipped.