AS11353 ASN-ESCXI

ASN-ESCXI is Education Service Center Region XI, one of the twenty regional service centres of the Texas education system. Registered at White Settlement in the Fort Worth area, it provides shared services — including internet connectivity — to the public school districts of its region.

What it's used for

ESC Region XI acts as an aggregator for K-12 school networks: districts buy transit and services through the centre rather than each contracting separately. The routing matches. RIS sees 4 v4 prefixes / 17,408 addresses, no IPv6, and 5 observed neighbours — a handful of adjacencies, so this is a regional aggregation network rather than a transit carrier, and the address count is consistent with serving many campuses of student and staff devices. Most of the space is one large block, 216.213.192.0/18, registered directly to the service center as ESC11-BLK-1, with two more ESC11-BLK-1 prefixes carved alongside it.

Notable

The fourth prefix, 208.84.136.0/22, registers not to the service center but to Denton Independent School District — and that is the point rather than an anomaly. A district holding its own space while the regional centre originates it in BGP is exactly what a shared K-12 connectivity provider looks like. Reverse DNS on that block returns vpn.dentonisd.org, confirming the block is genuinely carrying the district's own traffic.

Interesting

That vpn. hostname names an access mechanism — a remote-access concentrator for staff — not a commercial VPN service. Reading a vpn label as a proxy provider is a standard trap; here it is simply a school district's remote-access gateway.