Online Object Identifier DER Encoder

Encode absolute OID in dot-notation ("2.999.1234") into Hex-String ("06 04 88 37 89 52")
Encode absolute OID in dot-notation ("2.999.1234") into C-Hex-String ("\x06\x04\x88\x37\x89\x52")
Encode absolute OID in dot-notation ("2.999.1234") into C-Array ({ 0x06, 0x04, 0x88, 0x37, 0x89, 0x52 })
Encode relative OID in dot-notation ("1234") into Hex-String ("0D 02 89 52")
Encode relative OID in dot-notation ("1234") into C-Hex-String ("\x0D\x02\x89\x52")
Encode relative OID in dot-notation ("1234") into C-Array ({ 0x0D, 0x02, 0x89, 0x52 })
Decode Hex-Notation ("06 04 88 37 89 52" or "\x06\x04\x88\x37\x89\x52" or { 0x06, 0x04, 0x88, 0x37, 0x89, 0x52 }) into dot-notation ("2.999.1234")

Source

Object ID converter by Matthias Gärtner, 06/1999. Converted to plain 'C' 07/2001.
Heavily improved version by Daniel Marschall, ViaThinkSoft June-July 2011.

Freeware - do with it whatever you want. Use at your own risk. No warranty of any kind.

Download source for C and PHP / View source at SVN repository / View source at GitHub