AS5723 Johns Hopkins University

JHU - Johns Hopkins University · registered in the United States

IPv4 addresses135,6807 prefixes · 0.004% of announced IPv4

Rank in United States#447largest network in US by IPv4 space, of 18,338 · <0.01% of US

Rank worldwide#1,440of 79,396 networks with IPv4

IPv61 x /32 (65,536 x /48)1 prefixes

CountryUnited States18,679 ASNs registered there

Open AS5723 in ASN lookup Look up an IP in this network (128.220.0.1) All networks in United States

IPv4 prefixes

All 7 prefixes, in address order.

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

IPv6 prefixes

All 1 prefix.

2606:2b00::/32

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IP-to-ASN data: iptoasn.com (public domain). Snapshot downloaded 2026-11-11, refreshed daily. Ranges are what each network announces in BGP, not registry allocations. Data sources