root@OpenWrt:~# iptables -L -v -t nat
Chain PREROUTING (policy ACCEPT 603 packets, 106K bytes)
 pkts bytes target     prot opt in     out     source               destination
  635  108K prerouting_rule  all  --  any    any     anywhere             anywhere
   40  4286 zone_lan_prerouting  all  --  br-lan any     anywhere             anywhere
  593  104K zone_wan_prerouting  all  --  wlan0  any     anywhere             anywhere

Chain POSTROUTING (policy ACCEPT 31 packets, 2008 bytes)
 pkts bytes target     prot opt in     out     source               destination
   78  5274 postrouting_rule  all  --  any    any     anywhere             anywhere
   31  2008 zone_lan_nat  all  --  any    br-lan  anywhere             anywhere
   47  3266 zone_wan_nat  all  --  any    wlan0   anywhere             anywhere

Chain OUTPUT (policy ACCEPT 36 packets, 2874 bytes)
 pkts bytes target     prot opt in     out     source               destination

Chain postrouting_rule (1 references)
 pkts bytes target     prot opt in     out     source               destination

Chain prerouting_lan (1 references)
 pkts bytes target     prot opt in     out     source               destination

Chain prerouting_rule (1 references)
 pkts bytes target     prot opt in     out     source               destination

Chain prerouting_wan (1 references)
 pkts bytes target     prot opt in     out     source               destination

Chain zone_lan_nat (1 references)
 pkts bytes target     prot opt in     out     source               destination

Chain zone_lan_prerouting (1 references)
 pkts bytes target     prot opt in     out     source               destination
   40  4286 prerouting_lan  all  --  any    any     anywhere             anywhere

Chain zone_wan_nat (1 references)
 pkts bytes target     prot opt in     out     source               destination
   47  3266 MASQUERADE  all  --  any    any     anywhere             anywhere

Chain zone_wan_prerouting (1 references)
 pkts bytes target     prot opt in     out     source               destination
   30  1680 DNAT       tcp  --  any    any     anywhere             anywhere            tcp dpt:www to:192.168.1.137
    0     0 DNAT       udp  --  any    any     anywhere             anywhere            udp dpt:80 to:192.168.1.137
  563  102K prerouting_wan  all  --  any    any     anywhere             anywhere