Turkish ID 🔖

This gem provides methods to validate Turkish Identification Numbers.

Add this line to your application's Gemfile:

gem 'turkish_id'

And then execute:

$ bundle

Or install it yourself as:

$ gem install turkish_id

Create a new instance:

identity_number = TurkishId.new(10000000146)

Use valid? method to check validity:

identity_number.valid?  #=> true

Create a new instance:

identity_number = TurkishId.new(10000000146)

Use registered? method to query the government registry:

identity_number.registered?("Ahmet", "Yılmaz", 1987)  #=> false

There is also a convenience method called not_in_registry? which is the logical equivalent of !registered?.

Use foreigner_registered? method to query the foreigner registry:

identity_number.foreigner_registered?("Yukihiro", "Matsumoto", 14, 4, 1965)  #=> false

There is also a convenience method called foreigner_not_in_registry? which is the logical equivalent of !foreigner_registered?.

You can generate ID numbers for your younger or elder relatives.

me = TurkishId.new(10000000146)

Calling younger_relative or elder_relative will return an Enumerable class.

me.elder_relative  #=> #<Enumerator:0x00007f9e629032d0>

You can perform standard Enumerable operations on it.

me.elder_relative.first  #=> 10003000082

3.times do
 puts me.elder_relative.next
end

#=> 10035998982
#=> 10005999902
#=> 10008999848

me.elder_relative.take(5)  #=> [10003000082, 10005999902, 10008999848, 10011999774, 10014999610]

And so on.

You can use the CLI for quick lookups:

$ turkish_id 10000000078  #=> true

The executable terminates with a proper exit status:

$ turkish_id 10000000078  #=> true
$ echo $?                 #=> 0
$ turkish_id 10000000079  #=> false
$ echo $?                 #=> 1

Run turkish_id --help to learn more:

Usage
  turkish_id ID_NUMBER [GIVEN_NAME SURNAME YEAR_OF_BIRTH]

Description
  turkish_id validates Turkish identity numbers.
  Only providing ID_NUMBER performs numerical validation (offline).
  Providing all arguments will query government registry (online).

Examples
  turkish_id 10000000078
  turkish_id 10000000146 Ahmet Yılmaz 1984
  turkish_id 10005999902 "Ayşe Nur" Yılmaz 1996

The Turkish Identification Number consists of 11 digits.

There are three conditions for a valid identification number:

1. d1 > 0
2. d10 == ((d1 + d3 + d5 + d7 + d9) * 7 - (d2 + d4 + d6 + d8)) mod 10
3. d11 == (d1 + d2 + d3 + d4 + d5 + d6 + d8 + d9 + d10) mod 10

Where dn refers to the n-th digit of the identification number.

Remember that a valid identification number does not imply the existence of an ID. It could only be used as a preliminary check e.g. before querying a government website. This is very similar to credit card validation.

This gem is used in production and tested against the following Ruby versions:

• ✅ 3.4.1 (stable)
• ✅ 3.3.6 (stable)
• ✅ 3.2.6 (stable)
• ⏳ 3.1.6 (security maintenance)
• 🪦 3.0.7 (end of life)

After checking out the repo, run bin/setup to install dependencies. Then, run rake spec to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

1. Fork the repository
2. Create your feature branch (git checkout -b my-new-feature)
3. Commit your changes (git commit -am 'Add some feature')
4. Push to the branch (git push origin my-new-feature)
5. Create new Pull Request

You can donate me at Liberapay. Thanks! ☕️

Yes.

Copyright © 2015-2025 Kerem Bozdas

This gem is available under the terms of the MIT License.