AS23503 — CONSTELLATION-ENERGY

AS23503 announces 2 IPv4 prefixes covering 4,352 addresses and 1 IPv6 prefixes.

About this network

The AS handle CONSTELLATION-ENERGY is held by Exelon Corporation.

What it's used for

• The address space carries corporate infrastructure for an energy utility, with netnames CONSTELLATION-ENERGY and PECONET (Philadelphia Electric Company; Network Operations Center).
• The AS announces 4352 IPv4 addresses across 5 prefixes and 1 IPv6 prefix, with only 4 observed neighbours, indicating an internal corporate estate rather than a transit or access network.

Notable

• Registrants largely agree with the announcer, with Exelon Corporation listed for the four largest prefixes and Philadelphia Electric Company; Network Operations Center for the smallest prefix.
• Constellation Energy was acquired by Exelon Corporation, which now operates the utility services under the Constellation brand.
• The inventory consists of finely subdivided IPv4 blocks within the 216.99.176.0/21 range and a single /24, consistent with site-by-site segmentation for a large corporate entity.

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

Announced prefixes

• 159.214.87.0/24
• 216.99.176.0/20
• 2605:4ac0::/32

Upstream networks

• AS202 Level 3 Parent, LLC
• AS1321 Verizon Business
• AS26425 Exelon Corporation
• AS3356 Level 3 Parent, LLC

Downstream networks

• AS26425 Exelon Corporation

Adjacent networks

• AS202 Level 3 Parent, LLC
• AS26425 Exelon Corporation
• AS1321 Verizon Business
• AS3356 Level 3 Parent, LLC