Slash	Netmask	1st Octet	2nd Octet	3rd Octet	4th Octet
/30	255.255.255.252	11111111	11111111	11111111	11111100
/29	255.255.255.248	11111111	11111111	11111111	11111000
/28	255.255.255.240	11111111	11111111	11111111	11110000
/27	255.255.255.224	11111111	11111111	11111111	11100000
/26	255.255.255.192	11111111	11111111	11111111	11000000
/25	255.255.255.128	11111111	11111111	11111111	10000000
/24	255.255.255.0	11111111	11111111	11111111	00000000
/23	255.255.254.0	11111111	11111111	11111110	00000000
/22	255.255.252.0	11111111	11111111	11111100	00000000
/21	255.255.248.0	11111111	11111111	11111000	00000000
/20	255.255.240.0	11111111	11111111	11110000	00000000
/19	255.255.224.0	11111111	11111111	11100000	00000000
/18	255.255.192.0	11111111	11111111	11000000	00000000
/17	255.255.128.0	11111111	11111111	10000000	00000000
/16	255.255.0.0	11111111	11111111	00000000	00000000
/15	255.254.0.0	11111111	11111110	00000000	00000000
/14	255.252.0.0	11111111	11111100	00000000	00000000
/13	255.248.0.0	11111111	11111000	00000000	00000000
/12	255.240.0.0	11111111	11110000	00000000	00000000
/11	255.224.0.0	11111111	11100000	00000000	00000000
/10	255.192.0.0	11111111	11000000	00000000	00000000
/9	255.128.0.0	11111111	10000000	00000000	00000000
/8	255.0.0.0	11111111	00000000	00000000	00000000
/7	254.0.0.0	11111110	00000000	00000000	00000000
/6	252.0.0.0	11111100	00000000	00000000	00000000
/5	248.0.0.0	11111000	00000000	00000000	00000000
/4	240.0.0.0	11110000	00000000	00000000	00000000
/3	224.0.0.0	11100000	00000000	00000000	00000000
/2	192.0.0.0	11000000	00000000	00000000	00000000
/1	128.0.0.0	10000000	00000000	00000000	00000000

What is Automatic Private IP Addressing (APIPA)?