Chain PREROUTING (policy ACCEPT 13956 packets, 1382K bytes)
num   pkts bytes target     prot opt in     out     source               destination
1     3158  208K DOCKER     all  --  any    any     anywhere             anywhere             ADDRTYPE match dst-type LOCAL
2        0     0 DNAT       tcp  --  any    any     anywhere             anywhere             tcp dpt:http to:192.168.137.111:7778
3        9   452 DNAT       tcp  --  any    any     anywhere             anywhere             tcp dpt:7778 to:192.168.137.111:7778

Chain INPUT (policy ACCEPT 513 packets, 92429 bytes)
num   pkts bytes target     prot opt in     out     source               destination

Chain OUTPUT (policy ACCEPT 2138 packets, 477K bytes)
num   pkts bytes target     prot opt in     out     source               destination
1        0     0 DOCKER     all  --  any    any     anywhere            !localhost/8          ADDRTYPE match dst-type LOCAL

Chain POSTROUTING (policy ACCEPT 2138 packets, 477K bytes)
num   pkts bytes target     prot opt in     out     source               destination
1        0     0 MASQUERADE  all  --  any    !docker0  172.17.0.0/16        anywhere
2        0     0 SNAT       tcp  --  any    any     anywhere             192.168.137.111      tcp dpt:7778 to:10.99.220.62

Chain DOCKER (2 references)
num   pkts bytes target     prot opt in     out     source               destination
1        0     0 RETURN     all  --  docker0 any     anywhere             anywhere