Network
Network and browser troubleshooting tools for DNS and email authentication lookups, IP ownership and subnet maths, HTTP message and URL analysis, and User-Agent and browser capability checks.
12 tools
Network
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User-Agent Parser
Parse a User-Agent string into browser, operating system, device, rendering engine, app context, and bot signals.
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URL Tools
Parse URLs, turn query strings into JSON, normalize links, remove tracking parameters, and flag risky patterns before sharing or debugging.
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HTTP Message Parser
Detects raw HTTP messages, cURL commands, and fetch snippets, unpacks the request line, status, headers, query, cookies, and body into a structured view, and re-emits the same call as thirty-plus client formats and target languages.
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cURL Converter
Convert a cURL command into the equivalent request in fetch, axios, Python requests, Go, Rust, PHP, Java, and around thirty other clients and languages, preserving method, URL, headers, cookies, and body, all in your browser.
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Cookie Parser
Parse Cookie and Set-Cookie headers and document.cookie strings into name, value, and attributes, decode URL-encoded, JSON, Base64, and JWT values, audit Secure, HttpOnly, SameSite, prefixes, and size, and export to many formats.
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Subnet Calculator
Calculate IPv4 subnet masks, network addresses, broadcast addresses, usable host ranges, and address counts from an IP and CIDR prefix.
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IP Address Converter
Detect IPv4, IPv6, IPv4-mapped IPv6, and integer IPs, convert between dotted decimal, integer, hex, binary, and compressed IPv6, and build reverse DNS names.
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IP Address Lookup
Look up the country, region, city, coordinates, time zone, ASN, and operator for any IPv4 or IPv6 address, up to 100 at once, and show your own public IP.
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DNS Lookup
Query DNS records (A, AAAA, CNAME, MX, TXT, NS, SOA, CAA, SRV, PTR) with TTLs, run a reverse PTR lookup on an IP, or trace a domain from the root servers to the authoritative answer.
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SPF & DMARC Checker
Check the SPF, DKIM, DMARC and MX records of a domain. The SPF chain is expanded through every include and counted against the RFC 7208 ten-lookup limit, and DMARC policy, alignment and report authorisation are read tag by tag.
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Email Header Analyzer
Parse the raw headers of a delivered message into a hop-by-hop path with the delay each hop added, the SPF, DKIM and DMARC results the receiver recorded, the addresses the message claims, and the tags inside its DKIM signatures.
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Browser Compatibility Detector
Test the current browser for real support across web APIs, CSS, JavaScript, media, storage, security context, and device capabilities.
Open tool
About this category
Networking shows up in everyday debugging long before you ever open a packet inspector: a User-Agent string in a log file you need to decode, a URL whose query parameters got URL-encoded twice, a domain you need to trace to the machine actually answering for it, an outgoing message the recipient keeps filing as spam, a /24 you have to split into smaller subnets, or a browser API that the customer's device just doesn't support.
These tools are designed for that kind of work — pasted-input first, with the option you actually need surfaced rather than buried. Parsing, analysis, and calculation happen in the browser; only the lookups that genuinely need the network — IP ownership, DNS records, email authentication policy — send the domain or address you type to our lookup service. Either way you have an answer in seconds, ready to copy back into the ticket, the doc, or the firewall rule.
What you can do here
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DNS and email authentication lookups
Query A, MX, TXT and other records, run reverse lookups and delegation traces, then check SPF, DKIM and DMARC and read raw headers hop by hop when mail gets rejected or filed as spam.
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IP ownership and subnet maths
Look up geolocation, ASN and timezone for one address or a whole batch, and compute network and broadcast addresses, host counts, and subdivisions for VPC design, firewall rules, and IPAM planning.
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HTTP messages and URL analysis
Parse raw requests and responses, convert a cURL command into the equivalent request in thirty-odd languages, and pick apart query parameters, cookie attributes, and tracking junk in a link.
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Client environment checks
Break down browser, engine, OS, and device class from a raw UA string, then detect runtime APIs, codecs, and limits to reproduce a bug or document a baseline for a customer.