Autonomous system
AS11534 PHILA-SCHOOL-DISTRICT
Education ARIN
Summary
The School District of Philadelphia
education government legacy
PHILA-SCHOOL-DISTRICT is the network of the School District of Philadelphia, the eighth-largest public school district in the United States and the largest in Pennsylvania. RIS sees a single IPv4 prefix, 170.235.0.0/16 — about 65,536 addresses — no IPv6, and 3 observed BGP neighbours.
What it's used for
School and administrative connectivity for the district: classroom and lab networks across its schools, the central administration, and the public-facing services that sit in front of them. The single /16 is the whole announced inventory, and reverse DNS on it resolves under philasd.org — the district's own domain, with extranet.philasd.org on an address in the block. That is first-party rDNS on first-party space, so the routing and the naming agree with the holder rather than pointing at some upstream or a third party.
Notable
The /16 is registered not to the school district but to the City of Philadelphia (CITY-OF-PHILLY). That is not a third-party registrant of the sort that signals leased or brokered address space; it is municipal reality. The district is a public body of the city, and the city holds the number resources for its agencies. A block registered to the city and announced by the schools is exactly what a shared municipal allocation looks like.
Three neighbours against 65k addresses is an end-site with a couple of upstreams — a large institution buying transit, not a carrier.
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 2026-10-29, 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
AS11534- Registry name
- PHILA-SCHOOL-DISTRICT
- Registrant
- The School District of Philadelphia
- Abuse contact
- arin-admin-poc@philasd.org
- Registered
- 1998-09-23
- Last changed
- 2022-09-01
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 0% valid · 0 valid, 1 with no ROA
- ROAs
- 0 authorising AS11534
- ASPA
- no ASPA record
- IRR
- 100% registered · 1 of 1 announcements
- Route objects
- 1 naming AS11534
Reputation
Classification and threat
Education University, school or national research and education network.
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: 448 networks and 1,849 prefixes, as published 2026-10-29. 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