netstat 결과 입니다..고수님들 해석 부탁해용

netstat 명령을 실행해서 보다가 이해가 가지 않는 부분이 있어서 이렇게 올립니다.

이거 어케 해석해야 할까요?

Active Internet connections (servers and established)

Proto Recv-Q Send-Q Local Address               Foreign Address             State       PID/Program name

tcp        0      0 0.0.0.0:80                  0.0.0.0:*                   LISTEN      28804/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           220.68.48.251:3191          SYN_RECV    -

tcp        0      0 0.0.0.0:21                  0.0.0.0:*                   LISTEN      22392/xinetd

tcp        0      0 0.0.0.0:22                  0.0.0.0:*                   LISTEN      22392/xinetd

tcp        0      0 0.0.0.0:25                  0.0.0.0:*                   LISTEN      13317/sendmail: acc

tcp        0      0 xxx.yyy.zzz.qqq:34695        203.250.148.51:80           ESTABLISHED 20013/python

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15981         ESTABLISHED 23020/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15975         ESTABLISHED 23013/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15996         ESTABLISHED 15491/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15997         ESTABLISHED 15044/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15992         ESTABLISHED 13958/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15993         ESTABLISHED 13549/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15994         ESTABLISHED 12743/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15995         ESTABLISHED 14158/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15988         ESTABLISHED 23029/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15989         ESTABLISHED 12966/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15991         ESTABLISHED 13776/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15984         ESTABLISHED 23030/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15985         ESTABLISHED 23028/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15986         ESTABLISHED 23025/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15987         ESTABLISHED 23027/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15939         ESTABLISHED 23038/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15965         ESTABLISHED 23021/httpd

tcp        0      0 xxx.yyy.zzz.qqq:80           125.138.87.76:15961         ESTABLISHED 23011/httpd

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위의 내용을 보시면 아시겠지만 웹 서버에 접속된 클라이언트를 확인할 수 있습니다.

그런데 동일한 아이피에서 여러 포트로 접속한 이유는 무엇일까요?..참고로 웹 페이지는 ajax 로 서비스

하고 있습니다.