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In page Data Encryption Standard:

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DES is insecure due to the relatively short 56-bit key size. In January 1999, distributed.net and the Electronic Frontier Foundation collaborated to publicly break a DES key in 22 hours and 15 minutes (see § Chronology). There are also some analytical results which demonstrate theoretical weaknesses in the cipher, although they are infeasible in practice[citation needed]. DES has been withdrawn as a standard by the NIST.[3] Later, the variant Triple DES was developed to increase the security level, but it is considered insecure today as well. DES has been superseded by the Advanced Encryption Standard (AES).