Heres a IPv4 hcmask if anyone is in the same situation.
python3 parse_knownhosts.py.txt .ssh/known_hosts > unknown
dfdf3c415d1513cc2664beecb8dad840b2132c28:17513529ea04fde116862d745a91afe0e7623ba6
hashcat -m 160 --hex-salt -m 160 unknown -a 3 ipv4.hcmask.txt
python3 parse_knownhosts.py.txt .ssh/known_hosts > unknown
dfdf3c415d1513cc2664beecb8dad840b2132c28:17513529ea04fde116862d745a91afe0e7623ba6
hashcat -m 160 --hex-salt -m 160 unknown -a 3 ipv4.hcmask.txt