signal from the edge

Network utilities,
settled in orbit.

Network, developer and privacy utilities that run in your browser, or one hop away on Cloudflare's edge. Nothing you type is sent anywhere unless you press a button that says so. Just bytes, and a little dust.

Network 7

Network↗

Subnet Calculator

Compute network, broadcast, usable hosts and masks for any IPv4 CIDR, and type/range/address-count math for IPv6 — shareable via URL.

Network↗

IP Info

Your connection as seen by Cloudflare's edge: public IP, datacenter, latency, TLS and HTTP version.

Network↗

DNS Lookup

Query any record type (A, AAAA, MX, TXT, NS, CNAME, SOA, CAA) for any hostname via DNS-over-HTTPS — shareable via URL.

Network↗

MAC Address Lookup

Identify a MAC address's vendor from the IEEE OUI registry (24/28/36-bit), and see whether it's locally administered or multicast — entirely offline.

Network↗

HTTP Ping

Sample round-trip latency to any URL from your own browser — min/avg/jitter over several requests, no server in between.

Network↗

TLS Certificate Decoder

Decode a PEM certificate entirely in your browser: issuer, subject, validity, public key, SANs, extensions and fingerprints — a hand-written DER/ASN.1 reader, no OpenSSL.

Network↗

IPv6 Subnet Calculator

Plan IPv6 networks: compress or expand any address, split a /48 into /64s with paging, classify address types and get ip6.arpa reverse names — offline, shareable via URL.

Email 2

Email↗

Email Header Analyzer

Paste raw email headers to see the Received hop chain with per-hop delays, and the SPF/DKIM/DMARC verdicts as reported by the verifying server.

Email↗

SPF, DKIM & DMARC Generator

Compose SPF, DKIM and DMARC TXT records with per-option explanations, RFC 7208 lookup counting, DKIM key formatting and DMARC best-practice warnings — offline.

Dev 9

Dev↗

JWT Decoder

Decode a JWT's header and payload, and check its exp/nbf claims — entirely in your browser, never sent anywhere.

Dev↗

Hash & Encoding

46 hash algorithms and URL encode/decode — computed locally as you type, no network.

Dev↗

File Hash Calculator

MD5, SHA-1/256/384/512, SHA3, BLAKE2b, BLAKE3, RIPEMD-160, Whirlpool, SM3, CRC32 — streamed through WebAssembly, entirely on-device.

Dev↗

User-Agent Parser

Decode any User-Agent string into browser, engine, OS and device type — pre-filled with your own, works on any UA pasted from a server log.

Dev↗

Security Headers Analyzer

Paste HTTP response headers to grade a site's security posture — CSP directive-by-directive, HSTS, frame protection — entirely offline.

Dev↗

Cron Parser

Decode a cron expression — field-by-field validation, plain-English description and the next run times in your timezone, entirely offline.

Dev↗

Unix Timestamp Converter

Epoch to ISO 8601 and back — unit auto-detection from magnitude, any IANA time zone, relative time and a live second/millisecond clock, entirely offline.

Dev↗

Base64 Encode / Decode

UTF-8 Base64 encode/decode in standard or URL-safe alphabet with optional padding, byte counts and alphabet auto-detection on decode — offline; the URL holds only the options.

Dev↗

chmod Calculator

Convert Unix permissions between octal (755), symbolic (rwxr-xr-x) and checkboxes, apply chmod expressions, derive umask results and copy the ready command — offline.

Privacy 1

Privacy↗

Fingerprint Observatory

Everything your browser exposes — passive signals, rendering, hardware, extensions and network probes, computed locally with explicit consent gates.

Why these tools are different

Most online utilities send whatever you type to a server and keep a log of it. These do the work in your browser: parsing, hashing, subnet math and decoding never leave the page.

A few tools need the network: a DNS query, a latency sample, a reverse lookup. Those requests start only when you press their button, go straight from your browser to the host named on the page, and the page says what is sent.

The site is a set of pre-rendered static files: there is no server-side application to exploit or to go down. Where the input is not sensitive, the result is encoded in the URL, so a link reproduces it. Visits are counted with cookieless analytics, described in the privacy policy.