Man pages matching name tcpcat in section 1:

tcpcat.1.en	debian 10 / ucspi-tcp
tcpcat.1.en	debian 10 / ucspi-tcp-ipv6
tcpcat.1.en	debian 11 / ucspi-tcp
tcpcat.1.en	debian 11 / ucspi-tcp-ipv6
tcpcat.1.en	debian 12 / ucspi-tcp
tcpcat.1.en	debian 12 / ucspi-tcp-ipv6