__IP
{4, __IP, "usr-ip"},
{1, __IP, "subnet-mask"},
{3, __IP, "routers"},
{4, __IP, "time-servers"},
{5, __IP, "ien116-name-servers"},
{6, __IP, "domain-name-servers"},
{7, __IP, "log-servers"},
{8, __IP, "cookie-servers"},
{9, __IP, "lpr-servers"},
{10, __IP, "impress-servers"},
{11, __IP, "resource-location-servers"},
{16, __IP, "swap-server"},
{21, __IP, "policy-filter"},
{28, __IP, "broadcast-address"},
{32, __IP, "router-solicitation-address"},
{33, __IP, "static-routes"},
{41, __IP, "nis-servers"},
{42, __IP, "ntp-servers"},
{44, __IP, "netbios-name-servers"},
{45, __IP, "netbios-dd-server"},
{48, __IP, "x-font-servers"},
{49, __IP, "x-display-managers"},
{50, __IP, "dhcp-requested-address"},
{54, __IP, "dhcp-server-identifier"},
{65, __IP, "nisplus-servers"},
{68, __IP, "mobile-ip-home-agent"},
{69, __IP, "smtp-server"},
{70, __IP, "pop-server"},
{71, __IP, "nntp-server"},
{72, __IP, "www-server"},
{73, __IP, "finger-server"},
{74, __IP, "irc-server"},
{75, __IP, "streettalk-server"},
{76, __IP, "streettalk-directory-assistance-server"},
{85, __IP, "nds-servers"},
case __IP: /* ip address */