A small collection of free, no-signup web tools built at MojaLab — the kind of quick utilities you reach for while wrangling servers, DNS and certificates. Look up your public IP, run a DNS or reverse-DNS (PTR) lookup, check a site's SSL certificate, and more — all straight from the browser. They're the practical spin-offs of the tutorials and experiments on the blog: whenever we needed a throwaway helper often enough, it grew into a proper little tool and landed here. No accounts, no tracking — just type and go.
A collection of free tools for developers, sysadmins and webmasters — quick network diagnostics, DNS checks and SSL inspection. All free and ready to use.
Moja·Lab
⎓ Workshop Bench · Networking Apparatus · Est. MMXXV
A cabinet of free instruments for developers and sysadmins — hand-wired network, DNS and security gauges, each humming on MojaLab's own valves. No signup, no fuss.
Bench status: 8 instruments warmed up · powered by api.mojalab.com, when needed
Network Bench
5 valvesWhat's My IP
IP·V1Read your public IP with location, ISP and hostname — one twist of the dial to copy.
Engage ▸▸DNS Lookup
DNS·V2Interrogate A, MX, TXT, NS, SOA and more against Google, Cloudflare, Quad9 or OpenDNS.
Engage ▸▸Reverse DNS
PTR·V3Trace the PTR record of any IP address back to its hostname.
Engage ▸▸DNS Propagation
PROP·V4Watch a domain's records ripple out across resolvers around the globe.
Engage ▸▸Subnet & CIDR Calculator
CIDR·V6Crunch any IPv4 subnet — network, broadcast, host range, netmask and wildcard — right in your browser.
Engage ▸▸Security Bench
3 valvesSSL Certificate Info
SSL·V5Inspect a site's certificate: issuer, validity dates and the full chain of trust.
Engage ▸▸JWT Decoder & Verifier
JWT·V7Decode, verify and even forge JSON Web Tokens — header, payload and signature, entirely client-side.
Engage ▸▸Password Generator
PWD·V8Forge strong random passwords or memorable BIP-39 passphrases — CSPRNG-backed, entirely in your browser.
Engage ▸▸More apparatus under construction in the back room — analytics & performance gauges coming soon.