Shortest Domain Names and World’s Shortest Email ID

Recently I have seen Google Ads by in.com as the “World’s Smallest EMail ID“, which provides 10GB space for your free email. Gmail currently provides 7GB and growing at the rate of 100MB per month. in.com is advertising to get more users for their portal with this catchy ad. Who wouldn’t love to have a shorted email address, that too in the in.com domain!

Domain Name – TLD, SLD

ICANN, the Internet Assigned Numbers Authority,  is the organization charged with overseeing the name and number systems of the Internet. The ICANN authorizes and accredits registrars for maintaining and servicing the registration process of domains names under each of the top-level domains (TLDs).  The registry is responsible for maintaining the database of names registered within the TLDs they administer. The registry receives registration information from each domain name registrar authorized to assign names in the corresponding TLD and publishes the information using a special service, the whois protocol.

The top-level domain (TLD) is the last part of an Internet domain name, the letters that follow the final dot of any domain name. For example, in the domain name www.example.com, the top-level domain is .com. The domain names are not case-sensitive. For example,

URL: http://www.ananthapuri.com/default.asp
Domain name: www.ananthapuri.com
Registered domain name: ananthapuri.com

The second-level domain (SLD) names are the names directly to the left of the TLDs. For example, in the domain www.ananthapuri.com, ananthapuri is the second-level domain and .com is the top level domain.

Domain Name Restrictions

According to RFC3696, which defines the format for DNS names and email addresses,

the labels (words or strings separated by periods) that make up a domain name must consist of only the ASCII [ASCII] alphabetic and numeric characters, plus the hyphen. No other symbols or punctuation characters are permitted, nor is blank space. If the hyphen is used, it is not permitted to appear at either the beginning or end of a label. There is an additional rule that essentially requires that top-level domain names not be all-numeric.

A DNS label may be no more than 63 octets long. This is in the form actually stored; if a non-ASCII label is converted to encoded “punycode” form (see Section 5), the length of that form may restrict the number of actual characters (in the original character set) that can be accommodated. A complete, fully-qualified, domain name must not exceed 255 octets.

So, a domain name / label can have from 1 to 63 characters, so the shortest domain name you can have is 1 character and the longest domain name is 63 characters long.

Shortest gTLD Domain Names

In 1993, ICANN reserved all single-letter and single letter / digit second-level domain names in the Generic Top-Level Domains (gTLD) liks .com, .net, and .org. But there are still a few domains with single letters which had been registered before the restrictions were imposed.

i.net (belongs toFuture Media Architects, Inc.)

q.com (redirect to quest.com)

q.net (Q Networks) 

x.com (belongs to paypal)

x.org (belongs to X Organization Fondadtion)

z.com (belongs to Nizzan).

Currently only x.org and i.net, actually host a website directly in the single-letter domains. Others domains redirect to sites in different domains. Also q.net does not appear to be active for web use.

Is there any other active single letter gTLD (.com, .net, .org, .biz, etc.) domains you have seen being used?

Shortest ccTLD Domain Names

For the Country Code Top Level Domains (ccTLD), the domain registrar for the country decides the minimum length of the domain name.

Many ccTLD supports single letter / digit second-level domain names  including:

.cn (China) – example: g.cn (Google China), d.cn

.fm (Federated States of Micronesia) – 1.fm, a.fm

.tv (Tuvalu) – 1.tv, u.tv

.gg (Guernsey) – g.gg

.pl (Poland) – g.pl

.nu (Niue) – n.nu

.st (São Tomé and Príncipe) – k.st

Currently India do not support 1 or 2 letter / digit .in domain names.

Shortest Email IDs

Now we know that the ccTLD domain names, afew of them listed above, are the shortest domains. So any single digit or letter email id in any of those domains would be the shortest. For example, x@1.fm would be one of the shortest email ids.

My shortest email id is s@teck.in :-) Even at in.com, the username must be at least four letters long, which makes 11 characters length, mine is 9 characters total length. :P

Longest Domain Names

Since the maximum length of a domain label is defined as 63 characters, there also will be many websites with the longest domain names. If you want, you can as well create one! I think that the subdomains or top level domain suffixes should be counted for the largest domain name.

Here is the list of a few longest domains.

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Email : sree@teck.in