Port 51397 what for ?

From my server's /var/log/messages (IP:xxx.xxx.xxx.xxx)
Mar 11 16:53:36 server kernel: Packet log: input DENY eth0 PROTO=17 193.0.14.129:53 xxx.xxx.xxx.xxx:51397 L=190 S=0x00 I=0 F=0x4000 T=49 (#52)
Mar 11 16:53:37 server kernel: Packet log: input DENY eth0 PROTO=17 198.41.0.4:53 xxx.xxx.xxx.xxx:51397 L=205 S=0x00 I=9282 F=0x0000 T=46 (#52)
Mar 11 16:53:37 server kernel: Packet log: input DENY eth0 PROTO=17 192.33.4.12:53 xxx.xxx.xxx.xxx:51397 L=189 S=0x00 I=43137 F=0x0000 T=46 (#52)
Mar 11 16:53:37 server kernel: Packet log: input DENY eth0 PROTO=17 202.12.27.33:53 xxx.xxx.xxx.xxx:51397 L=269 S=0x00 I=41215 F=0x0000 T=52 (#52)
Mar 11 16:53:37 server kernel: Packet log: input DENY eth0 PROTO=17 192.5.5.241:53 xxx.xxx.xxx.xxx:51397 L=266 S=0x00 I=32829 F=0x0000 T=53 (#52)
Mar 11 16:53:38 server kernel: Packet log: input DENY eth0 PROTO=17 128.9.0.107:53 xxx.xxx.xxx.xxx:51397 L=265 S=0x00 I=0 F=0x4000 T=46 (#52)
Mar 11 16:53:39 server kernel: Packet log: input DENY eth0 PROTO=17 192.58.128.30:53 xxx.xxx.xxx.xxx:51397 L=472 S=0x00 I=0 F=0x4000 T=44 (#52)
Mar 11 16:53:39 server kernel: Packet log: input DENY eth0 PROTO=17 128.63.2.53:53 xxx.xxx.xxx.xxx:51397 L=268 S=0x00 I=0 F=0x4000 T=47 (#52)
Mar 11 16:53:42 server kernel: Packet log: input DENY eth0 PROTO=17 193.0.14.129:53 xxx.xxx.xxx.xxx:51397 L=268 S=0x00 I=0 F=0x4000 T=49 (#52)
There are so many requests sent to port 51397 being rejected and make a big messages log. Did anyone know what service this port provide ?

 

 

 

 

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