Calculator allows you to verify the ISBN number entered.

It presents data deriving from the unique social security number, such as date of birth, sex, serial number and check its correctness.

 Verifier numbers EAN-13 Calculator allows you to verify the number entered EAN-13.          

Calculator allows you to verify the number entered ISSN (International Standard Serial Number serial publication). FAQ: How ISSN number?              

Verifier allows you to validate entered REGON number

Calculator allows you to verify the correctness of the entered account number.                

Calculator checks to see if the specified expression is a palindrome. Palindrome - sounding words as read from left to right and from right to left.    

Calculator allows you to verify the number entered ISMN (International Standard Serial Number Printing music).      

Verifier allows you to validate the tax identification number entered

 Verifier numbers EAN-8 Calculator allows you to verify the number entered EAN-8.          

Calculator allows you to verify the number entered Postnet.