What is an IDN Domain?

For an Indian business, an IDN matters when your customers think in Hindi, Tamil or Bengali but every address they have seen is English. This guide covers what the punycode layer actually does, India’s .भारत domain, how registration differs, what search engines make of the names, and the spoofing risk you should defend against.

What IDN Domains Are

An IDN is a domain that contains at least one label shown to users in a non-Latin script — Devanagari, Tamil, Bengali, Arabic, Chinese, Cyrillic — or in Latin letters with diacritics. Computers encode these characters in Unicode, but the DNS was built for ASCII, so an IDN travels through a translation protocol called IDNA that converts it to an ASCII-compatible form before any lookup.

• U-label — the Unicode form you type and see in the browser.
• A-label — the ASCII form actually stored in DNS, which always starts with xn--.
• IDNA — the 2003 and 2008 protocol pair that decides which characters are valid and how the two forms convert.

Once converted, registration, renewal, DNS and hosting all work like any other domain. The differences live in what each registry’s language table allows. Read what a TLD is for the label structure the script sits inside.

Punycode: How Browsers Store IDNs

Punycode is the encoding that turns a script label into ASCII without breaking the DNS. The application normalises the Unicode label, encodes it as punycode, and prefixes xn--; that string is the only form that ever travels in DNS packets.

Two worked examples: German Bücher.example stores as xn--bcher-kva.example, and Russia’s .рф ccTLD stores as xn--p1ai. The Hindi word परीका appears as xn--11b5bs1di in ICANN’s own glossary.

Applications without IDNA support still reach the site if given the ASCII form, but they display the cryptic xn-- string instead of your script.

India's .भारत Domain

India’s flagship IDN is .भारत, the Devanagari country-code TLD run by the .IN Registry (NIXI), joined by IDN zones under .in in several scheduled languages — Bengali, Gujarati, Punjabi, Tamil, Telugu and others. The first IDN ccTLDs entered the global root zone in May 2010, so these names have been live for over a decade.

A Devanagari address reads naturally for a Hindi-first audience on signage, ads and packaging. The caveats are practical: some legacy tools still display the xn-- form, and older email or CMS fields can reject internationalised input — test before you print anything.

How to Register an IDN

The flow differs from a Latin domain in exactly one step:

1. Pick a TLD that allows your script — each registry approves characters per language table under IDNA2008 rules.
2. Type the name in your script at the registrar; the system converts it to punycode and shows you both forms.
3. Verify the A-label (the xn-- string) — that is what WHOIS records, DNS entries and certificates will carry.
4. Point DNS and hosting exactly as you would for a Latin name; renewal works the same way.
5. Test email delivery and any older tools with the name before you publish it everywhere.

The language-table limit exists on purpose: restricting each zone to one approved character set is what makes mixed-script spoofing harder to register. Our IDN domain registration in India page lists the supported scripts and the current quote.

The SEO Reality of IDNs

Search engines index IDN sites normally; the script is display, not a ranking factor in itself. What matters is consistency — canonical tags, HTTPS certificates and sitemaps should all use one form (Unicode or punycode) so crawlers never see two identities for one page.

Where the script does help is click-through with the audience that reads it: a Devanagari address in a Hindi search result reads as local, not translated. Most Indian businesses register the Latin name as the primary brand and take the .भारत or Devanagari variant to defend it.

Risks: Homograph Attacks

A homograph attack registers a look-alike name using visually identical characters from another script. Cyrillic а, е, і, р render almost exactly like Latin a, e, i, p, so a fake of wikipedia.org can be indistinguishable on screen from the real site.

Defences stack up: registries limit each TLD to one approved language table, browsers warn on mixed-script addresses, and emoji domains are excluded outright because IDNA2008 disallows those code points — some registrars sell them only on non-ICANN Handshake TLDs. For your own brand, register the look-alike script versions before someone else does; see our guide on ways to protect a domain name.