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Network
Calculate a CIDR block’s network range, or classify an IPv4/IPv6 address as public, private, or reserved.
Runs entirely in your browser, nothing is uploadedLook up what a well-known network port is used for, or generate a random ephemeral port for local dev.
Open toolOpen a network recording to find the slowest and largest requests, failures, third-party calls and credentials left in headers.
Open tool