Network operations for the people running the wires.
Browser-based diagnostics for engineers who manage networks. CIDR math, DNS, traceroute, BGP, SSL, latency — all running locally. Paste an IP, get an answer.
NetOps — Free Online Network Reconnaissance and Troubleshooting Tools: Traceroute, Ping, DNS Lookup, WHOIS, Nmap, GeoIP, Subnet Calculator.Subnet calculator · live
Type a CIDR. We compute the network, broadcast, host count, and a usable range — instantly, in your browser.
- network
- 10.42.0.0/22
- netmask
- 255.255.252.0
- wildcard
- 0.0.3.255
- first host
- 10.42.0.1
- last host
- 10.42.3.254
- broadcast
- 10.42.3.255
- total hosts
- 1,022 usable
- type
- private (RFC 1918)
- binary
00001010.00101010.000000xx.xxxxxxxx
Latency · cloud regions
diagnostics · interactive
DNS Lookup
$ dns-lookup <domain>
Enter a hostname or IP and click Run to get started
all · network tools (10)
Calculate IP ranges, CIDR notation, network and broadcast addresses.
DNS lookup, WHOIS, port checker, reverse DNS, and more. Essential networking utilities.
Browser-measured round-trip latency to every AWS region. DynamoDB healthcheck endpoints, live parallel testing.
Browser-measured round-trip latency to Google Cloud regions. BigQuery regional endpoints, live parallel testing.
Browser-measured round-trip latency to Microsoft Azure regions. Cognitive Services endpoints, live parallel testing.
Browser-measured round-trip latency to DigitalOcean regions. Spaces (S3-compatible) endpoints, live parallel testing.
Check SSL certificate details, expiry dates, and chain information.
Build ~/.ssh/config visually. Manage hosts, keys, and tunnels.
Run anything in this list without
your IP touching our servers.
CIDR math runs entirely in your browser. Latency tests fire from your browser. WHOIS, traceroute, and the other backend-required diagnostics route through a thin, log-light edge — and we never store your queries.
read about how it works