30 fast, no-nonsense developer & network tools — free, no sign-up, nothing tracked. Most run entirely in your browser.
Your public IPv4 / IPv6 as seen by the server, plus the request headers behind it.
live$ digResolve A, AAAA, MX, TXT, NS, CNAME and SOA records for any domain.
live$ ptrPTR lookup with forward-confirmed reverse DNS (FCrDNS) — the check mail servers run on a sender's IP.
local$ cidrIPv4 CIDR breakdown: network, broadcast, netmask, wildcard, host range and usable count.
Look up a domain's SPF record, parse its mechanisms and flag the 10-lookup limit.
live$ dmarcResolve and parse the _dmarc policy, with warnings for p=none, missing rua and partial pct.
live$ mxList a domain's mail servers by priority and resolve each to its A / AAAA addresses.
live$ dkimFetch a DKIM public key by selector and flag revoked (empty p=) or test-mode keys.
local$ hdrPaste raw email headers to see the delivery hop timeline with delays, SPF/DKIM/DMARC results and key fields. All local.
Cryptographically-strong random passwords with full control over length and character sets.
local$ uuidGenerate one or many RFC-4122 v4 UUIDs. Copy with a click.
local$ ulidGenerate time-sortable ULIDs and UUID version 7 identifiers, locally.
local$ qrTurn any text or URL into a QR code with selectable error correction. Download PNG or SVG.
local$ barcodeGenerate CODE128, EAN-13/8, UPC, CODE39 and ITF-14 barcodes. Download PNG or SVG.
local$ wordsMemorable diceware-style passphrases from a curated wordlist, with a live entropy estimate.
local$ hueGenerate harmonious colour palettes (analogous, complementary, triad, mono). Click to copy hex.
local$ loremPlaceholder text by paragraphs, sentences or words.
local$ icoMake a favicon from letters or an emoji — colours, shape, live previews, PNG / SVG download.
local$ totpGenerate a 2FA secret, a scannable provisioning QR and a live one-time code. All local.
Validate a cron expression and preview its next run times in your local timezone.
local$ baseConvert integers between binary, octal, decimal, hex and any base 2–36. Arbitrary precision.
local$ chmodBuild Unix file permissions from checkboxes — octal, symbolic and the chmod command, both ways.
invoker.tools is a growing toolbox of fast utilities for developers, sysadmins and technical users: network and DNS lookups, email-deliverability checks (SPF, DKIM, DMARC, MX), TLS certificate inspection, generators for passwords, UUIDs, QR codes and barcodes, plus encoders, converters and text helpers. There is nothing to install and no account to create.
Privacy is the default. Client-side tools process your input entirely in your browser, so it never leaves your device. The few server-side tools only perform the public DNS or TLS lookup they need and store nothing.
Yes. Every tool on invoker.tools is free to use with no sign-up, no account and no usage limits.
Most tools run entirely in your browser, so your input never leaves your device. A few network tools (DNS, SPF, SSL and similar) perform a lookup on the server because they have to query public DNS or connect to a host.
Generators, encoders, converters and text tools are client-side and process everything locally. Tools marked “live” do a server-side DNS lookup or TLS connection.
No. Everything works in a normal web browser on desktop or mobile — there is nothing to download or install.
No ads and no third-party trackers. The toolbox is built by invoker as a clean, fast utility set.
Yes. The collection grows regularly with new developer and network tools across the existing categories.