Network & DevOps ToolkitNetwork & DevOps Toolkit
DNS lookups, subnet math, cron schedules & encoding utilities — free and private.
Pick a tool
DNS Lookup
Query A/AAAA/MX/TXT/NS/CNAME records for any domain (DoH).
Open →Subnet / CIDR Calculator
Network, broadcast, mask, host range & counts for any IPv4 CIDR.
Open →Cron Expression Builder
Build & understand cron schedules in plain English.
Open →Base64 Encode / Decode
Encode or decode Base64 text.
Open →URL Encode / Decode
Percent-encode or decode URL components.
Open →JSON Formatter
Pretty-print, validate & minify JSON.
Open →JWT Decoder
Decode & inspect a JWT's header, payload & claims.
Open →Password Generator
Generate strong random passwords & passphrases.
Open →UUID / ULID Generator
Generate UUIDs, ULIDs & Nano IDs for keys and records.
Open →Hash Generator
MD5, SHA-1, SHA-256 & more for any text input.
Open →Unix Timestamp Converter
Convert Unix timestamps to/from human dates.
Open →Regex Tester
Build & test regular expressions with live matches.
Open →Data Size Converter
Convert bytes, KB, MB, GB & data rates instantly.
Open →Number Base Converter
Convert decimal, hex, binary & octal numbers.
Open →API Spec Explorer
Explore live OpenAPI / Swagger specs in a console.
Open →Text Encryptor
Encrypt & decrypt text locally with a passphrase.
Open →DevOps Cheat Sheet
Cron syntax, subnet masks, common ports, HTTP status codes & DNS record types — one page.
Open →MX Record Lookup
Mail servers, priorities & TTLs for any domain.
Open →TXT / SPF Lookup
SPF, DKIM, DMARC & verification TXT records, decoded.
Open →NS Record Lookup
Who's authoritative — the first DNS-propagation check.
Open →HMAC Generator
HMAC-SHA256 signatures for webhooks & API auth.
Open →File Checksum & Verify
Hash any file locally & verify published checksums.
Open →Frequently asked questions
Are these network and DevOps tools free?
Yes — every tool on this site is completely free to use, with no account, signup, paywall or usage limits. Open a tool and start typing.
Is my data uploaded to a server?
No. The tools run entirely in your browser, so tokens, passwords and text never leave your machine. The one deliberate exception is the DNS lookup, which sends your query straight to Cloudflare's public DNS-over-HTTPS resolver (1.1.1.1) — and nowhere else.
What tools are included?
A DNS lookup, an IPv4 subnet/CIDR calculator, a cron expression builder, Base64 and URL encoders, a JSON formatter, a JWT decoder, password/UUID/ULID generators, MD5 and SHA hash generators, a Unix timestamp converter, a regex tester, data-size and number-base converters, an OpenAPI spec explorer and a text encryptor — plus a DevOps cheat sheet.
Do the tools work on mobile?
Yes. Everything runs in any modern browser on desktop or mobile. Because the work happens client-side, the tools stay fast even on a slow connection.
Why this toolkit?
Network and DevOps work is a stream of tiny lookups: what's the mask for a /26, when does this cron fire, what's in this JWT, why is this JSON invalid. Each tool here answers one of those questions instantly, with no install, no signup and no data leaving your browser. Start with the DNS lookup, the subnet calculator or the cheat sheet.
🔐 Private by design: every tool runs in your browser. DNS lookups go straight to Cloudflare's DoH resolver (1.1.1.1); nothing else is sent to any server, and nothing is logged.