Network tools

Common Ports List

Searchable TCP/UDP port reference with protocol, category and legacy filters.

Runs in your browser

DNS Lookup Tool

Read A, AAAA, MX, TXT, NS, SOA and CAA for any domain, with SPF and DMARC checks and a second-resolver comparison.

DNS Propagation Checker

Send one lookup to Google Public DNS, Cloudflare 1.1.1.1 and a server resolver at once, then see which ones are propagated and which are stale.

Firewall Rule Helper

Draft UFW, iptables, nftables, firewalld, Nginx and Cloudflare rules with a CIDR check, a risk review and a ready rollback, all in your browser.

Runs in your browser

IP Geolocation Lookup

Paste a public IP or domain and read back the country, city, ASN and ISP, with two providers compared and honest accuracy notes.

IP Subnet Calculator

Network ID, broadcast, usable range, binary boundary, same-subnet check, even splits and VLSM for any IPv4 prefix.

Runs in your browser

IPv4 and IPv6 Converter

Paste one address and read back every form: dotted, integer, hex, binary, expanded, compressed and mapped.

Runs in your browser

MAC Address Lookup

Paste a MAC in any format and read back the OUI vendor, the cast and admin bits, the VM prefix and every spelling.

Runs in your browser

netsh wlan Command Reference

Search every netsh wlan command for Windows, copy it in one click, with output and variants.

Runs in your browser

HTTP Ping Test

Run repeated HTTP checks on any URL and read status, success rate, average latency and jitter.

Online Port Checker

Probe TCP ports on a host or public IP, read the exposure notes, and copy a tidy report.

Public IP vs Local IP

Paste a local IP and the public one websites see, then read what each is: IPv4 or IPv6, which range, routable or not, and the NAT boundary.

Runs in your browser

Response Time Checker

Hit a public URL several times from the backend and read average, median and the slow outliers, with status and redirect context right next to the latency.

Reverse DNS Lookup

Punch in an IP or hostname, read the PTR record, and check whether the name points back to the same address.

SSH Tunnel Command Generator

Pick a direction, drop in your ports and hosts, and copy the ssh tunnel command plus a matching ssh config block.

Runs in your browser

Traceroute Visualizer

Paste traceroute or tracert output and read the hops, RTT, timeouts and latency jumps in a clean report.

Runs in your browser

Uptime Checker

Probe a URL several times, pick what counts as up, read the success rate and latency, then size the downtime budget.

Website Status Checker

Sample a site's final status a few times over, compare it against the first-response headers and redirect path, and read an availability report.

What Is My IP Address

See the public IP your browser hands out right now, check IPv4 and IPv6 reach, and read the ISP, ASN and rough location.

Runs in your browser

WHOIS Lookup

Type a domain and read back the registrar, expiry, status codes and nameservers, with renewal risk and live DNS.