Johns Hopkins University

Data as of 2026-07-26
BGP inherited
Cluster stats
Netblocks16 · 203,522 IPv4 addresses
IPv6 1 prefix (largest 2606:2b00::/32)
All fragments 23 blocks across 3 clusters
Cluster ID214419282
RegistryBGP
Customersfind customers using this network →
Evidence & provenance ?
Attribution BGP parent (inherited)
Shared handles clustered on 13 shared RIR contact/maintainer handles
Registry names 6 distinct registrant names across these blocks
full provenance (JSON) → · how attribution works · report an issue

Footprint over time

6 weekly snapshots · JSON
18 +1 netblocks since 2026-07-05
2026-07-05 peak 18 2026-07-26

IP Ranges (16)

⬇ export CSV
CIDR Org name Registry Status Confidence
12.181.141.0/24 Johns Hopkins HealthCare BGP ANNOUNCED ● high
128.220.0.0/16 Johns Hopkins University BGP ANNOUNCED ● high
128.244.0.0/16 Johns Hopkins University Applied Physics Laboratory ARIN DIRECT ALLOCATION ● high
162.129.0.0/16 Johns Hopkins University BGP ANNOUNCED ● high
192.12.13.0/24 Johns Hopkins University BGP ANNOUNCED ● high
192.12.14.0/24 Johns Hopkins University BGP ANNOUNCED ● high
198.57.32.0/21 Johns Hopkins University BGP ANNOUNCED ● high
198.57.39.0/24 Johns Hopkins University BGP ANNOUNCED ● high
198.57.40.0/22 Johns Hopkins University BGP ANNOUNCED ● high
204.9.128.0/24 Johns Hopkins University Applied Physics Laboratory BGP ANNOUNCED ● high
204.9.128.0/21 Johns Hopkins University Applied Physics Laboratory ARIN DIRECT ALLOCATION ● high
204.9.130.0/24 Johns Hopkins University Applied Physics Laboratory BGP ANNOUNCED ● high
204.124.184.0/22 Johns Hopkins University BGP ANNOUNCED ● high
206.126.239.77/32 Johns Hopkins APL PEERINGDB ASSIGNED ● high
206.126.239.78/32 Johns Hopkins APL PEERINGDB ASSIGNED ● high
2606:2b00::/32 Johns Hopkins University BGP ANNOUNCED ● high

IPv6 ranges (1)

CIDR
2606:2b00::/32

Domains hosted in this network

what's this?
jhu.edu jhuapl.edu sdss.org

Network trust

what's this?
RPKI hygiene: B how networks compare →
83.3% of checked blocks have valid RPKI ROA coverage (15 of 18)
No discrepancies found among checked blocks.

NIC Handles

AS5723 AS6618 AS77 AS77 DZ24-ARIN DZ24-ARIN DZ24-ARIN JHU-Z JHUAPL ZJ20-ARIN ZJ20-ARIN ZJ20-ARIN +1 more