Check services running on port on linux

[oracle@ptud1 ~]$ netstat -an | grep "1521"
tcp        0      0 127.0.0.1:41247             127.0.0.1:1521              ESTABLISHED
tcp        0      0 :::1521                     :::*                        LISTEN     
tcp        0      0 ::ffff:192.168.2.156:50967  ::ffff:192.168.2.156:1521   ESTABLISHED
tcp        0      0 ::ffff:192.168.2.156:50971  ::ffff:192.168.2.156:1521   ESTABLISHED
tcp        0      0 ::ffff:192.168.2.156:50595  ::ffff:192.168.2.156:1521   ESTABLISHED
tcp        0      0 ::ffff:192.168.2.156:1521   ::ffff:192.168.2.156:50967  ESTABLISHED
tcp        0      0 ::ffff:127.0.0.1:1521       ::ffff:127.0.0.1:41247      ESTABLISHED
tcp        0      0 ::ffff:192.168.2.156:1521   ::ffff:192.168.2.156:50595  ESTABLISHED
tcp        0      0 ::ffff:192.168.2.156:1521   ::ffff:192.168.2.156:50971  ESTABLISHED
unix  2      [ ACC ]     STREAM     LISTENING     15211  /var/run/uuidd/request
unix  2      [ ACC ]     STREAM     LISTENING     205472 /var/tmp/.oracle/sEXTPROC1521

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