Autonomous system profile

Review registration details, announced prefixes, network relationships and historical snapshots.

AS5723

Announcement observedARIN

JHU - Johns Hopkins University · JHU

This profile is assembled from CHA.LA's normalized registration, routing and observation snapshots.

Last active9/29/2026, 13:30:04Snapshot expired

View network topology RDAP registration

ASN: AS5723
Registration country: United States
Name: JHU - Johns Hopkins University
Abbreviation: JHU
Registration date: 9/6/1995, 04:00:00
Status: Announcement observed
RIR: ARIN

Network relationships and announced prefixes

ASN / prefix	Description / organization	Geographic scope	First seen	Last active	IPv4	IPv6	Status
128.220.0.0/16BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 08:00:00	9/29/2026, 08:00:00	✓	×	Currently valid
128.220.122.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 16:00:00	9/15/2026, 16:00:00	✓	×	Historical record
162.129.0.0/16BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 08:00:00	9/29/2026, 08:00:00	✓	×	Currently valid
192.12.13.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 08:00:00	9/29/2026, 08:00:00	✓	×	Currently valid
192.12.14.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 08:00:00	9/29/2026, 08:00:00	✓	×	Currently valid
198.57.32.0/21BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 08:00:00	9/29/2026, 08:00:00	✓	×	Currently valid
198.57.39.0/24BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 08:00:00	9/29/2026, 08:00:00	✓	×	Currently valid
198.57.40.0/22BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 08:00:00	9/29/2026, 08:00:00	✓	×	Currently valid
204.124.184.0/22BGP · IPv4	Announced prefixBGP route observation	Not applicable · BGP prefix	9/15/2026, 08:00:00	9/29/2026, 08:00:00	✓	×	Currently valid

BGP prefixes have no geographic country; the column is marked not applicable.

Registration and sources

Organization: JHU - Johns Hopkins University
RIR: ARIN
Registration country: United States
Registration date: 9/6/1995, 04:00:00
Abuse contact: noc@jhu.edu

Snapshot trend

9/29/2026, 13:30:049 v41 v65 Upstream · 0 Uncertain

ASN route snapshotThis page reads collected ASN, prefix, relationship and history data. External interfaces are used for initial collection and scheduled refreshes.Source keys: cha-la-external-routing · rir-rdap-asn · iana-rdap-asn-bootstrap