Autonomous system
AS5723 JHU
Education ARIN
Summary
Johns Hopkins University
education university research legacy
The campus network of Johns Hopkins University in Baltimore, Maryland, one of the United States' foremost research universities, under the handle JHU.
What it's used for
- Connectivity for the university's schools, libraries and research groups on the legacy
128.220.0.0/16, alongside162.129.0.0/16and several198.57.xblocks used by its medical and health-system estate. - Backs a very large research computing footprint, plus IPv6 out of a
/32.
Notable
- Institutional address space serving students, faculty, hospitals and labs, not paying subscribers.
- Johns Hopkins consistently ranks first among US universities in research spending, and the size and spread of the address space reflect a network that has to serve both a campus and a large academic medical enterprise.
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 2026-10-16, licensed CC BY-NC-SA 3.0. Transit is inferred from observed BGP paths, never declared by either party.
Address space
Summary
IPv4 7 prefixes · 136K addresses IPv6 1 prefixes
| Country | Name | Prefixes |
|---|---|---|
| US | United States of America | 8 |
Registry
Allocation record
- Registry
- ARIN
- Handle
AS5723- Registry name
- JHU
- Registrant
- Johns Hopkins University
- Abuse contact
- noc@jhu.edu
- Registered
- 1995-09-06
- Last changed
- 2020-09-08
- Allocation
- assigned
Routing security
RPKI and IRR
- RPKI
- 100% valid · 9 valid, 0 with no ROA
- ROAs
- 9 authorising AS5723
- ASPA
- no ASPA record
- IRR
- 100% registered · 9 of 9 announcements
- Route objects
- 11 naming AS5723
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: 442 networks and 1,783 prefixes, as published 2026-10-17. 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