Network
Browse Network developer tools on RunTools.dev, with focused utilities you can open quickly for debugging, conversion, validation, and daily workflow tasks.
Network
11DNS Lookup
Perform DNS lookups (A, MX, TXT, etc.) for any domain.
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IP & Location Lookup
See your current public IP, ISP, and approximate location.
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CIDR / Subnet Calculator
Enter an IPv4 CIDR to instantly calculate the network address, broadcast address, and host range.
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User Agent Parser
Analyze browser, OS, device, and engine details from any user agent string.
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Certificate Decoder
Decode PEM X.509 certificates locally and inspect key fields.
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CIDR Merger
Normalize and merge IPv4 CIDR lists into a minimal set.
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HTTP Header Parser
Parse raw HTTP header lines, normalize names, and inspect invalid lines quickly.
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MIME Type Lookup
Look up MIME types by extension or reverse lookup extensions from MIME names.
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HTTP Status Lookup
Search HTTP status codes, filter by class, and review practical meanings quickly.
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IPv6 Expander
Expand, compress, and inspect IPv6 addresses with RFC 5952 canonical output, prefixes, and zone IDs.
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Port Number Lookup
Search well-known TCP and UDP ports by number, service, or keyword and see what normally listens there.
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