Network Class Subnet

** Credit Web arrange by Me

Class A	0.0.0.1-126.255.255.255	.	Private 10.0.0.0-10.255.255.255	.	.
Number of Bits Borrowed from Host Portion	Subnet Mask	จำนวน network	จำนวน host	จำนวนsubnet mask bits (ฐาน 10)	จำนวนsubnet mask bits (ฐาน 2)
1	255.128.0.0	2	8388606	/9	(11111111.10000000.0.0)
2	255.192.0.0	4	4194302	/10	(11111111.11000000.0.0)
3	255.224.0.0	8	2097150	/11	(11111111.11100000.0.0)
4	255.240.0.0	16	1048574	/12	(11111111.11110000.0.0)
5	255.248.0.0	32	524286	/13	(11111111.11111000.0.0)
6	255.252.0.0	64	262142	/14	(11111111.11111100.0.0)
7	255.254.0.0	128	131070	/15	(11111111.11111110.0.0)
8	255.255.0.0	256	65534	/16	(11111111.11111111.0.0)
9	255.255.128.0	512	32766	/17	(11111111.11111111.10000000.0)
10	255.255.192.0	1024	16382	/18	(11111111.11111111.11000000.0)
11	255.255.224.0	2048	8190	/19	(11111111.11111111.11100000.0)
12	255.255.240.0	4096	4094	/20	(11111111.11111111.11110000.0)
13	255.255.248.0	8192	2046	/21	(11111111.11111111.11111000.0)
14	255.255.252.0	16384	1022	/22	(11111111.11111111.11111100.0)
15	255.255.254.0	32768	510	/23	(11111111.11111111.11111110.0)
16	255.255.255.0	65536	254	/24	(11111111.11111111.11111111.0)
17	255.255.255.128	131072	126	/25	(11111111.11111111.11111111.10000000)
18	255.255.255.192	262144	62	/26	(11111111.11111111.11111111.11000000)
19	255.255.255.224	524288	30	/27	(11111111.11111111.11111111.11100000)
20	255.255.255.240	1048576	14	/28	(11111111.11111111.11111111.11110000)
21	255.255.255.248	2097152	6	/29	(11111111.11111111.11111111.11111000)
22	255.255.255.252	4194304	2	/30	(11111111.11111111.11111111.11111100)
23	255.255.255.254	8388608	2*	/31	(11111111.11111111.11111111.11111110)

Class B	128.0.0.0-191.255.255.255	.	Private 172.16.0.0-172.31.255.255	.	.
Number of Bits Borrowed from Host Portion	Subnet Mask	จำนวน network	จำนวน host	จำนวนsubnet mask bits (ฐาน 10)	จำนวนsubnet mask bits (ฐาน 2)
1	255.255.128.0	2	32766	/17	(11111111.11111111.10000000.0)
2	255.255.192.0	4	16382	/18	(11111111.11111111.11000000.0)
3	255.255.224.0	8	8190	/19	(11111111.11111111.11100000.0)
4	255.255.240.0	16	4094	/20	(11111111.11111111.11110000.0)
5	255.255.248.0	32	2046	/21	(11111111.11111111.11111000.0)
6	255.255.252.0	64	1022	/22	(11111111.11111111.11111100.0)
7	255.255.254.0	128	510	/23	(11111111.11111111.11111110.0)
8	255.255.255.0	256	254	/24	(11111111.11111111.11111111.0)
9	255.255.255.128	512	126	/25	(11111111.11111111.11111111.10000000)
10	255.255.255.192	1024	62	/26	(11111111.11111111.11111111.11000000)
11	255.255.255.224	2048	30	/27	(11111111.11111111.11111111.11100000)
12	255.255.255.240	4096	14	/28	(11111111.11111111.11111111.11110000)
13	255.255.255.248	8192	6	/29	(11111111.11111111.11111111.11111000)
14	255.255.255.252	16384	2	/30	(11111111.11111111.11111111.11111100)
15	255.255.255.254	32768	2*	/31	(11111111.11111111.11111111.11111110)

Class C	192.0.0.0-233.255.255.255	.	Private 192.168.0.0-192.168.255.255	.	.
Number of Bits Borrowed from Host Portion	Subnet Mask	จำนวน network	จำนวน host	จำนวนsubnet mask bits (ฐาน 10)	จำนวนsubnet mask bits (ฐาน 2)
1	255.255.255.128	2	126	/25	(11111111.11111111.11111111.10000000)
2	255.255.255.192	4	62	/26	(11111111.11111111.11111111.11000000)
3	255.255.255.224	8	30	/27	(11111111.11111111.11111111.11100000)
4	255.255.255.240	16	14	/28	(11111111.11111111.11111111.11110000)
5	255.255.255.248	32	6	/29	(11111111.11111111.11111111.11111000)
6	255.255.255.252	64	2	/30	(11111111.11111111.11111111.11111100)
7	255.255.255.254	128	2*	/31	(11111111.11111111.11111111.11111110)