Autonomous system
AS11205 CITY-OF-PHILADELPHIA
Unclassified ARIN
Summary
City of Philadelphia
government legacy
CITY-OF-PHILADELPHIA is the municipal network of the City of Philadelphia, Pennsylvania. It announces a single legacy /16 plus two more-specifics carved from it, all registered to the city itself.
What it's used for
Municipal government IT. The announced space is 170.115.0.0/16 with 170.115.247.0/24 and 170.115.248.0/23 deaggregated on top of it — 3 prefixes, 65,536 addresses, no IPv6, and only 2 observed BGP neighbours. That combination is the classic city-government profile: a large historical allocation carrying city departments, public-safety systems, libraries and public-facing services, multihomed across a small number of upstreams rather than peering broadly.
Notable
Every announced prefix is registered to PHILADELPHIA — the AS holder and the address holder are the same body, so there is no third-party-registrant ambiguity here. The one sampled reverse-DNS record, gscm.phila.gov, resolves under the city's own phila.gov domain, confirming that the space carries first-party city services rather than being sublet to anyone else.
Interesting
The two more-specifics announced alongside the covering /16 are a deliberate traffic-engineering choice, not an accident of registration. Announcing a /24 and a /23 on top of the aggregate lets the city steer particular services onto a particular upstream while the /16 keeps a route alive if that path fails — a pattern common in organisations that hold a large classful-era block and want to split it across links without giving up the aggregate.
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 2026-10-21, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 1 prefixes · 65.54K addresses IPv6 0 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 1 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS11205- Registry name
- CITY-OF-PHILADELPHIA
- Registrant
- City of Philadelphia
- Abuse contact
- dennis.doyne@phila.gov
- Registered
- 1998-05-18
- Last changed
- 2025-10-23
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 3 with no ROA
- ROAs
- 0 authorising AS11205
- ASPA
- no ASPA record
- IRR
- 100% registered · 3 of 3 announcements
- Route objects
- 2 naming AS11205
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: 442 networks and 1,779 prefixes, as published 2026-10-22. 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