Open-source network measurement and vulnerability research, built entirely on publicly available data.

Try1.1.1.1lrt.ltCVE-2021-44228AS8764

Open Source Networks operates measurement infrastructure that maps the public internet to improve transparency and security. We catalogue exposed services and known vulnerabilities across autonomous systems, publish our methodology, and work openly with network operators and incident response teams. Every measurement we run is based solely on publicly available information and open sources.

Domains we track

Live coverage of the global domain namespace from open zone data.

423.2M

Total domains observed

411.3M

Active domains

5,997

Domain extensions (TLDs)

+2.8M

New in the last 7 days

cached · Updated 2026-11-12 06:40 UTC

Vulnerability intelligence

Known vulnerabilities measured on real, reachable hosts — not only listed in a catalogue.

7.0M

Hosts with known CVEs

62.9M

Hosts with open services

424.6k

CVEs tracked

1,779

Known exploited (KEV)

Most widespread CVEsAffected hosts

cached · Updated 2026-11-12 06:40 UTC

What we do

Centralised analysis of network infrastructure, built on open sources.

Attack surface mapping

We continuously enumerate reachable services across IPv4 and IPv6 to build a public picture of internet-facing exposure.

Vulnerability intelligence

Detected service banners are correlated with known CVEs, with severity breakdown and trends over time.

ASN-level analytics

Exposure and vulnerability distribution aggregated per autonomous system, searchable and sortable.

Responsible disclosure

We notify operators of critical exposure and honour opt-out requests through transparent abuse contacts.

By the numbers

381.4M

Hosts observed

62.9M

Hosts with open services

7.0M

Hosts with known CVEs

58.4k

Networks observed (ASNs)