Autonomous system
AS23503 CONSTELLATION-ENERGY
Unclassified ARIN
Summary
Constellation Energy
business energy corporate
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-ENERGYandPECONET(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. Source, and how to suggest an edit.
Interconnection
Peering at a glance
Internet exchanges
No exchange port on file. Many exchanges publish no participant list, so this is not proof of absence.
Exchange presence is recorded rather than inferred: the directory collected by Packet Clearing House (https://www.pch.net/ixp/data) on 2026-10-18, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 5 prefixes · 4.35K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 6 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS23503- Registry name
- CONSTELLATION-ENERGY
- Registrant
- Exelon Corporation
- Abuse contact
- netadmin2@exeloncorp.com
- Registered
- 2002-03-29
- Last changed
- 2016-08-08
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 15 with no ROA
- ROAs
- 0 authorising AS23503
- ASPA
- no ASPA record
- IRR
- 87% registered · 13 of 15 announcements
- Route objects
- 11 naming AS23503
Reputation
Classification and threat
Unclassified Not in the curated lists. Most of the ~80,000 allocated ASNs are not.
Spamhaus DROP
Not on ASN-DROP The network as a whole is not listed.
No DROP prefixes None of its announced space is on the DROP prefix list.
Spamhaus DROP ("Don't Route Or Peer") lists space and networks run by, or hijacked for, spam and cybercrime operations: 443 networks and 1,784 prefixes, as published 2026-10-19. A short, high-confidence list, so a match is worth taking seriously, and absence from it says little on its own.
FBI IC3
No IC3 indicators Nothing from the FBI IC3 feed.
IC3 threat data is alpha. Absence of an indicator is not evidence of good behaviour, only of absence from this one feed.
Elsewhere