AS5723 — JHU
Network type: education
AS5723 announces 7 IPv4 prefixes covering 135,680 addresses and 1 IPv6 prefixes.
About this network
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, alongside 162.129.0.0/16 and several 198.57.x blocks 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.
Announced prefixes
- 128.220.0.0/16
- 162.129.0.0/16
- 192.12.13.0/24
- 192.12.14.0/24
- 198.57.32.0/21
- 198.57.40.0/22
- 204.124.184.0/22
- 2606:2b00::/32
Upstream networks
- AS6939 Hurricane Electric LLC
- AS11096 FloridaNet
- AS174 Cogent Communications, LLC
- AS10886 University of Maryland
- AS3356 Level 3 Parent, LLC
Downstream networks
- AS77 Johns Hopkins University Applied Physics Laboratory
Adjacent networks
BGP / ASN / CIDR
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IPv4
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IPv6
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Search Results
IPv4 Prefixes
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IPv6 Prefixes
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Total Prefixes
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Unique /24s
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⚠ SUSPICIOUS PREFIX ANNOUNCEMENTS DETECTED