return {
    ["FTP data (20)"] = "20",
    ["FTP control (21)"] = "21",
    ["SSH (22)"] = "22",
    ["Telnet (23)"] = "23",
    ["SMTP (25)"] = "25",
    ["DNS (53)"] = "53",
    ["BOOTP Server / DHCP (67)"] = "67",
    ["BOOTP Client / DHCP (68)"] = "68",
    ["TFTP (69)"] = "69",
    ["HTTP (80)"] = "80",
    ["POP3 (110)"] = "110",
    ["Ident IRC (113)"] = "113",
    ["NNTP (119)"] = "119",
    ["NTP (123)"] = "123",
    ["Netbios Name service (137)"] = "137",
    ["Netbios Datagram Service (138)"] = "138",
    ["Netbios Session Service (139)"] = "139",
    ["IMAP (143)"] = "143",
    ["SNMP (161)"] = "161",
    ["SNMP Trap (162)"] = "162",
    ["IRC (194)"] = "194",
    ["HTTPS (443)"] = "443",
    ["SMB file sharing (445)"] = "445",
    ["ISAKMP (500)"] = "500",
    ["DHCPv6 client (546)"] = "546",
    ["DHCPv6 server (547)"] = "547",
    ["RTSP (554)"] = "554",
    ["NNTPS (563)"] = "563",
    ["IPP/CUPS (631)"] = "631",
    ["FTPS data (989)"] = "989",
    ["FTPS control (990)"] = "990",
    ["IMAPS (993)"] = "993",
    ["IRCS (994)"] = "994",
    ["POP3S (995)"] = "995",
}