AS32058 — SBG-AS1

AS32058 announces 10 IPv4 prefixes covering 5,376 addresses and 2 IPv6 prefixes.

About this network

SBG-AS1 is the autonomous system for Sinclair Broadcast Group, Inc.

What it's used for

• The address space carries internal corporate infrastructure for a major US television broadcaster, with reverse DNS entries pointing to atsc3.com (e.g., 126.93.55.69.rtr.bltmmd.atsc3.com), indicating support for ATSC 3.0 next-generation TV transmission.
• The AS announces 5376 IPv4 addresses across 10 prefixes and 2 IPv6 prefixes, while maintaining only 4 observed neighbours. This high address-to-neighbour ratio, combined with registrants pointing to a single corporation, indicates an internal corporate estate with site-by-site segmentation rather than an access or transit network.

Notable

• All registrants in the evidence pack are consistent with the announcer, listing either "Sinclair Broadcast Group, Inc." or "SINCLAIR BROADCAST GROUP INC." for prefixes such as 69.55.80.0/21 and 216.147.192.0/23.
• The address inventory is finely subdivided into /23 and /24 blocks under netnames SBG-NET4-01 and SBG-NET4-02, reflecting a structured internal network design for a large media conglomerate.

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

Announced prefixes

• 63.88.62.0/23
• 69.55.80.0/21
• 69.55.88.0/23
• 69.55.92.0/23
• 69.55.95.0/24
• 216.147.192.0/23
• 216.147.196.0/24
• 216.147.198.0/24
• 216.147.202.0/24
• 216.147.204.0/24
• 2607:4640::/36
• 2620:0:120::/48

Upstream networks

• AS701 Verizon Business
• AS3356 Level 3 Parent, LLC
• AS6939 Hurricane Electric LLC

Adjacent networks

• AS701 Verizon Business
• AS3356 Level 3 Parent, LLC
• AS6939 Hurricane Electric LLC

Internet exchanges

• Megaport IX Ashburn — Ashburn, United States