プロセスリストを出力するlsof（エルエスオーエフ）をインストール
# pkg install lsof
Updating FreeBSD repository catalogue...
Fetching meta.conf: 100% 163 B 0.2kB/s 00:01
Fetching packagesite.txz: 100% 6 MiB 1.3MB/s 00:05
Processing entries: 100%
FreeBSD repository update completed. 30508 packages processed.
All repositories are up to date.
The following 1 package(s) will be affected (of 0 checked):
New packages to be INSTALLED:
lsof: 4.94.0,8
Number of packages to be installed: 1
112 KiB to be downloaded.
Proceed with this action? [y/N]:
[1/1] Fetching lsof-4.94.0,8.txz: 100% 112 KiB 114.2kB/s 00:01
Checking integrity... done (0 conflicting)
[1/1] Installing lsof-4.94.0,8...
[1/1] Extracting lsof-4.94.0,8: 100%
=====
Message from lsof-4.94.0,8:
--
NOTE: Due to the way the FreeBSD build clusters make packages,
you may see a warning similar to the following:
lsof: WARNING: compiled for FreeBSD release 11.1-RELEASE-p6; this is 11.1-RELEASE-p4.
This is because the poudriere jails that build the packages don't have the
corresponding kernel installed, so they don't know that the kernel version is different.
This warning can be ignored if you are using a system that is updated via freebsd-update
and are using pre-built packages.
ポート番号を指定して確認
# lsof -i:53
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
named 533 bind 16u IPv4 0xfffff80003ad0020 0t0 UDP www.server-bff.net:domain
named 533 bind 18u IPv4 0xfffff80003aee000 0t0 TCP www.server-bff.net:domain (LISTEN)
named 533 bind 19u IPv6 0xfffff80003ad0000 0t0 UDP localhost:domain
named 533 bind 21u IPv6 0xfffff80003aefb70 0t0 TCP localhost:domain (LISTEN)
named 533 bind 22u IPv6 0xfffff80003ad1f80 0t0 UDP [fe80:2::1]:domain
named 533 bind 23u IPv6 0xfffff80003aef7a0 0t0 TCP [fe80:2::1]:domain (LISTEN)
named 533 bind 24u IPv4 0xfffff80003ad1f60 0t0 UDP localhost:domain
named 533 bind 25u IPv4 0xfffff80003aef3d0 0t0 TCP localhost:domain (LISTEN)
ntpを指定して確認
# lsof -c ntp
COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME
ntpd 13659 ntpd cwd VDIR 0,101 1024 2 /
ntpd 13659 ntpd rtd VDIR 0,101 1024 2 /
ntpd 13659 ntpd 0r VCHR 0,18 0t0 18 /dev/null
ntpd 13659 ntpd 1r VCHR 0,18 0t0 18 /dev/null
ntpd 13659 ntpd 2r VCHR 0,18 0t0 18 /dev/null
ntpd 13659 ntpd 3u unix 0xfffff8007744d6d0 0t0 ->0xfffff80003ada368
ntpd 13659 ntpd 20u IPv6 0xfffff8007799a200 0t0 UDP *:ntp
ntpd 13659 ntpd 21u IPv4 0xfffff8007799a9c0 0t0 UDP *:ntp
ntpd 13659 ntpd 22u IPv4 0xfffff80003ad1020 0t0 UDP www.server-bff.net:ntp
ntpd 13659 ntpd 23u IPv6 0xfffff8007799aa00 0t0 UDP localhost:ntp
ntpd 13659 ntpd 24u IPv6 0xfffff80003ad1640 0t0 UDP [fe80:2::1]:ntp
ntpd 13659 ntpd 25u IPv4 0xfffff8007799a6c0 0t0 UDP localhost:ntp
ntpd 13659 ntpd 26u rte 0xfffff800b376e380 0t0
LISTEN確認
# lsof -i | grep LISTEN
named 533 bind 18u IPv4 0xfffff80003aee000 0t0 TCP www.server-bff.net:domain (LISTEN)
named 533 bind 21u IPv6 0xfffff80003aefb70 0t0 TCP localhost:domain (LISTEN)
named 533 bind 23u IPv6 0xfffff80003aef7a0 0t0 TCP [fe80:2::1]:domain (LISTEN)
named 533 bind 25u IPv4 0xfffff80003aef3d0 0t0 TCP localhost:domain (LISTEN)
named 533 bind 26u IPv4 0xfffff80003aef000 0t0 TCP localhost:rndc (LISTEN)
mariadbd 797 mysql 21u IPv4 0xfffff80003c593d0 0t0 TCP localhost:mysql (LISTEN)
sshd 833 root 3u IPv6 0xfffff80003c5a3d0 0t0 TCP *:ssh (LISTEN)
sshd 833 root 4u IPv4 0xfffff80003af17a0 0t0 TCP *:ssh (LISTEN)
sendmail 854 root 4u IPv4 0xfffff80003af1b70 0t0 TCP localhost:smtp (LISTEN)
httpd 20117 root 3u IPv6 0xfffff800989db000 0t0 TCP *:http (LISTEN)
httpd 20117 root 4u IPv4 0xfffff80077b9d000 0t0 TCP *:http (LISTEN)
httpd 20117 root 6u IPv6 0xfffff80003af0b70 0t0 TCP *:https (LISTEN)
httpd 20117 root 7u IPv4 0xfffff800772343d0 0t0 TCP *:https (LISTEN)
httpd 25574 www 3u IPv6 0xfffff800989db000 0t0 TCP *:http (LISTEN)
httpd 25574 www 4u IPv4 0xfffff80077b9d000 0t0 TCP *:http (LISTEN)
httpd 25574 www 6u IPv6 0xfffff80003af0b70 0t0 TCP *:https (LISTEN)
httpd 25574 www 7u IPv4 0xfffff800772343d0 0t0 TCP *:https (LISTEN)
httpd 25747 www 3u IPv6 0xfffff800989db000 0t0 TCP *:http (LISTEN)
httpd 25747 www 4u IPv4 0xfffff80077b9d000 0t0 TCP *:http (LISTEN)
httpd 25747 www 6u IPv6 0xfffff80003af0b70 0t0 TCP *:https (LISTEN)
httpd 25747 www 7u IPv4 0xfffff800772343d0 0t0 TCP *:https (LISTEN)
httpd 29014 www 3u IPv6 0xfffff800989db000 0t0 TCP *:http (LISTEN)
httpd 29014 www 4u IPv4 0xfffff80077b9d000 0t0 TCP *:http (LISTEN)
httpd 29014 www 6u IPv6 0xfffff80003af0b70 0t0 TCP *:https (LISTEN)
httpd 29014 www 7u IPv4 0xfffff800772343d0 0t0 TCP *:https (LISTEN)
httpd 29508 www 3u IPv6 0xfffff800989db000 0t0 TCP *:http (LISTEN)
httpd 29508 www 4u IPv4 0xfffff80077b9d000 0t0 TCP *:http (LISTEN)
httpd 29508 www 6u IPv6 0xfffff80003af0b70 0t0 TCP *:https (LISTEN)
httpd 29508 www 7u IPv4 0xfffff800772343d0 0t0 TCP *:https (LISTEN)
httpd 29523 www 3u IPv6 0xfffff800989db000 0t0 TCP *:http (LISTEN)
httpd 29523 www 4u IPv4 0xfffff80077b9d000 0t0 TCP *:http (LISTEN)
httpd 29523 www 6u IPv6 0xfffff80003af0b70 0t0 TCP *:https (LISTEN)
httpd 29523 www 7u IPv4 0xfffff800772343d0 0t0 TCP *:https (LISTEN)
httpd 29525 www 3u IPv6 0xfffff800989db000 0t0 TCP *:http (LISTEN)
httpd 29525 www 4u IPv4 0xfffff80077b9d000 0t0 TCP *:http (LISTEN)
httpd 29525 www 6u IPv6 0xfffff80003af0b70 0t0 TCP *:https (LISTEN)
httpd 29525 www 7u IPv4 0xfffff800772343d0 0t0 TCP *:https (LISTEN)
httpd 29528 www 3u IPv6 0xfffff800989db000 0t0 TCP *:http (LISTEN)
httpd 29528 www 4u IPv4 0xfffff80077b9d000 0t0 TCP *:http (LISTEN)
httpd 29528 www 6u IPv6 0xfffff80003af0b70 0t0 TCP *:https (LISTEN)
httpd 29528 www 7u IPv4 0xfffff800772343d0 0t0 TCP *:https (LISTEN)
httpd 29592 www 3u IPv6 0xfffff800989db000 0t0 TCP *:http (LISTEN)
httpd 29592 www 4u IPv4 0xfffff80077b9d000 0t0 TCP *:http (LISTEN)
httpd 29592 www 6u IPv6 0xfffff80003af0b70 0t0 TCP *:https (LISTEN)
httpd 29592 www 7u IPv4 0xfffff800772343d0 0t0 TCP *:https (LISTEN)
httpd 29674 www 3u IPv6 0xfffff800989db000 0t0 TCP *:http (LISTEN)
httpd 29674 www 4u IPv4 0xfffff80077b9d000 0t0 TCP *:http (LISTEN)
httpd 29674 www 6u IPv6 0xfffff80003af0b70 0t0 TCP *:https (LISTEN)
httpd 29674 www 7u IPv4 0xfffff800772343d0 0t0 TCP *:https (LISTEN)
httpd 29760 www 3u IPv6 0xfffff800989db000 0t0 TCP *:http (LISTEN)
httpd 29760 www 4u IPv4 0xfffff80077b9d000 0t0 TCP *:http (LISTEN)
httpd 29760 www 6u IPv6 0xfffff80003af0b70 0t0 TCP *:https (LISTEN)
httpd 29760 www 7u IPv4 0xfffff800772343d0 0t0 TCP *:https (LISTEN)
以上