Look up A DNS records for any domain and verify IPv4 address mapping with TTL values. Instantly check DNS A record propagation and IP assignments.
Common ports lookup: search 96 well-known TCP and UDP ports by number or service name. Shows whether each port is safe to expose to the internet and why not. Works offline.
Build docker run commands with port mappings, volume mounts, environment variables, restart policies, and resource limits. Generates multi-line shell commands ready to copy. Free, browser-based.
Test your internet speed online. Measure download speed, upload speed, ping, and jitter instantly in your browser using Cloudflare's servers.
Look up geolocation, ISP, timezone, and other information for any IP address. Find your public IP and trace IP locations instantly.
Check if an IP address is listed on 15+ major DNSBL spam blacklists including Spamhaus, SpamCop, and Barracuda. Instantly audit email server reputation and identify deliverability issues.
Instantly look up the geographic location, ISP, timezone, and network details for any IP address. Enter an IP or detect your own public IP with one click.
IP range to CIDR converter that turns a start and end address into the smallest exact set of CIDR blocks. Merges overlapping ranges, handles IPv4 and IPv6. Free, no signup.
IPv6 address expander converts shorthand IPv6 to the full 8-group form and compresses it back to RFC 5952 canonical notation. Keeps CIDR, zone IDs and embedded IPv4.
kubectl command generator with 40 recipes: get pods, crash-loop logs, exec, port-forward, rollback, drain. Every flag explained and destructive commands flagged. Free online.
Latency percentile calculator turns raw response time samples into p50, p95, p99 and p99.9 with mean and standard deviation. Runs in your browser, free, no signup.
Look up the manufacturer or vendor of any network device from its MAC address OUI prefix. Identifies device maker, unicast/multicast type, global/local scope, and randomised MAC detection for iOS and Android.
Test HTTP latency to a public website with repeated ping attempts, average response time, jitter, and request-failure tracking.
Check if a specific port is open or closed on any host or IP address. Test TCP connectivity for common service ports like HTTP, SSH, MySQL, and more.
Perform a reverse DNS PTR lookup for any IPv4 or IPv6 address to find its mapped hostname. Useful for server audits, email deliverability, and IP reputation checks.
Look up SRV DNS records and inspect priority, weight, port, and target host values for service routing validation - no signup needed.
Generate SSH config Host entries for ~/.ssh/config with IdentityFile, ProxyJump, keep-alive, port forwarding, and more. Free SSH config builder, browser-based, no signup.
Subnet calculator computes IPv4 network masks, broadcast addresses, and host ranges from any IP and CIDR prefix - fast, free, and works entirely in your browser.