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Here is an abridged output of lsof -i tcp:XXXXXX:

COMMAND PID  USER FD TYPE DEVICE
python3 9336 root 3u IPv4 3545328
python3 9336 root 5u IPv4 3545374

closed as unclear what you're asking by Romeo Ninov, Stephen Rauch, Anthon, EightBitTony, GAD3R Jul 15 '17 at 11:22

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$ man 8 lsof | grep -A 10 '^\s\{7\}DEVICE'
   DEVICE     contains the device numbers, separated by commas, for a character special, block special, regular, directory or NFS file;

              or ``memory'' for a memory file system node under Tru64 UNIX;

              or the address of the private data area of a Solaris socket stream;

              or a kernel reference address that identifies the file (The kernel reference address may be used for FIFO's, for example.);

              or the base address or device name of a Linux AX.25 socket device.

              Usually only the lower thirty two bits of Tru64 UNIX kernel addresses are displayed.

Or type

man 8 lsof

Inside man you can search with /. Than type directley without space a regex. In your case ^\s*DEVICE and you will jump to DEVICE.

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