Reserved test domain names

reserved-test-domains.md

Reserved Test Domain Names

Making up fake email addresses that use real domain names is a bad idea and in my experience also extremely common. To help people avoid that situation, here is a list of all the domain names that I know of that are reserved explicitly for purposes like testing and documentation.

Reserved Top-Level Domains

.test

Reserved by RFC2606/RFC6761.

".test" is recommended for use in testing of current or new DNS related code.

.example

Reserved by RFC2606/RFC6761.

".example" is recommended for use in documentation or as examples.

.invalid

Reserved by RFC2606/RFC6761.

".invalid" is intended for use in online construction of domai names that are sure to be invalid and which it is obvious at a glance are invalid.

.localhost

Reserved by RFC2606/RFC6761.

The ".localhost" TLD has traditionally been statically defined in host DNS implementations as having an A record pointing to the loop back IP address and is reserved for such use. Any other use would conflict with widely deployed code which assumes this use.

Second Level Domains

example.com / example.net / example.org

Reserved by RFC2606/RFC6761 for use in documentation and examples.

Test IDN top-level Domains

DOMAIN	DOMAIN (A-LABEL)	LANGUAGE	SCRIPT
إختبار	xn--kgbechtv	Arabic	Arabic
آزمایشی	xn--hgbk6aj7f53bba	Persian	Arabic
测试	xn--0zwm56d	Chinese	Han (Simplified variant)
測試	xn--g6w251d	Chinese	Han (Traditional variant)
испытание	xn--80akhbyknj4f	Russian	Cyrillic
परीक्षा	xn--11b5bs3a9aj6g	Hindi	Devanagari (Nagari)
δοκιμή	xn--jxalpdlp	Greek, Modern (1453-)	Greek
테스트	xn--9t4b11yi5a	Korean	Hangul (Hangŭl, Hangeul)
טעסט	xn--deba0ad	Yiddish	Hebrew
テスト	xn--zckzah	Japanese	Katakana

References

• https://www.rfc-editor.org/rfc/rfc2606.html
• https://www.rfc-editor.org/rfc/rfc6761.html
• https://www.iana.org/domains/reserved
• https://example.com/
• https://example.net/
• https://example.org/