Služby na well-known portech (TCP)
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20 	FTP -- Data
21 	FTP -- Control
22 	SSH Remote Login Protocol
23 	Telnet
25      SMTP
42      Nameserver (i 42 UDP)
80 	HTTP
110 	POP3
156 	SQL Server
161(UDP) 	SNMP
443 	HTTPS

Privatni adresy
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10.0.0.0 – 10.255.255.255 => /8
172.16.0.0 – 172.31.255.255 => /12
192.168.0.0 – 192.168.255.255 => /16