AS77
Johns Hopkins University Applied Physics Laboratory
Reputation · trust score
A transparent 0–100 signal. Every entity starts at a neutral baseline of 65; threat-intel blocklists, exposure, reverse-DNS, routing and allocation each adjust it up or down. Higher is more trustworthy.
- Baseline (neutral) 65
- Academic allocation +6
- Trust score 71 / 100
Experimental · trust-vectors model v1.1.0 — a transparent heuristic, not a definitive verdict. How it works →
About The Johns Hopkins University Applied Physics Laboratory LLC
The Johns Hopkins University Applied Physics Laboratory LLC is a not-for-profit, United States Navy-sponsored, university-affiliated research center (UARC) in Howard County, Maryland, United States.
Network profile
Source: PeeringDB →Present at 1 internet exchange: Equinix Ashburn
Top CIDR ranges
| CIDR | IPs | PTR Density | Organization | Country | State | City |
|---|---|---|---|---|---|---|
| 128.244.0.0/16 | 65.5K |
0.6%
|
Johns Hopkins University Applied Physics Laboratory | US | Maryland | Laurel |
| 204.9.128.0/24 | 256 |
0.0%
|
Johns Hopkins University Applied Physics Laboratory | US | — | — |
| 204.9.130.0/24 | 256 |
0.0%
|
Johns Hopkins University Applied Physics Laboratory | US | — | — |
BGP Announced Prefixes
Live BGP anomalies →Prefixes AS77 actually originates in BGP, observed across our RIPE RIS collectors. This live routing view can differ from the registry allocation above.
| Prefix | Announcement samples | Last seen |
|---|---|---|
| 128.244.0.0/16 | 4,834 | 2026-07-23 16:34:42 |
| 204.9.128.0/24 | 4,810 | 2026-07-23 16:34:42 |
| 204.9.130.0/24 | 1,387 | 2026-07-23 15:07:25 |
Frequently Asked Questions
What is AS77?
AS77 is an Autonomous System Number assigned to Johns Hopkins University Applied Physics Laboratory. An ASN identifies a network that controls a specific set of IP addresses and determines how traffic is routed across the internet via BGP (Border Gateway Protocol).
How many IP addresses does AS77 announce?
AS77 announces 66.0K IPv4 addresses distributed across 3 routed CIDR prefixes. The network is registered in United States.
Who operates AS77?
AS77 is operated by Johns Hopkins University Applied Physics Laboratory. The organization is based in United States. You can view all IP ranges and related ASNs on the organization page.
What country is AS77 registered in?
AS77 is registered in United States. This indicates where the network operator is headquartered, though the IP addresses it announces may serve users globally.
