IPv4 subnet calculator
Calculate the network, broadcast, usable address range and host count from an IPv4 address with a CIDR prefix or subnet mask.
Domain Punycode converter
Convert internationalized domain names between Unicode and ASCII, with per-line validation and CSV export.
One domain per line, up to 200. Enter hostnames without a scheme, port or path. ASCII and Unicode appear together.
CSV
About this tool
Compare an internationalized domain with its xn-- representation before copying it into a configuration.
How to use
Enter one domain per line. Unicode names and ASCII names beginning with xn-- can be mixed; each result shows both forms. Invalid rows are marked individually while valid results remain available. Copy or download the complete CSV. Up to 200 non-empty lines are supported.
Enter bare domains without a scheme, path, port or email address. Conversion checks ASCII label and domain lengths and verifies a round trip in the browser. It does not query DNS, domain registration or ownership.
Common questions
Does a valid conversion prove the domain is genuine?
No. Conversion checks formatting and a browser round trip, not DNS, ownership or look-alike risks. Enter bare domains without a scheme, path or port.
Does one invalid domain stop the whole batch?
No. Each nonempty line is checked separately, and valid conversions remain available alongside marked error rows. Correct those rows and try again. You can mix Unicode domains with xn-- names, up to 200 nonempty lines; paste domains rather than complete URLs.
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