서브넷마스크 표 (Subnetmask)

서브넷마스크 표 (SubnetMask)

Bit	/32	/31	/30	/29	/28	/27	/26	/25	/24
Decimal	.255	.254	.252	.248	.240	.224	.192	.128	.0
User IP’s	none	none	2	6	14	30	62	126	254
Hexadecimal	FF.FF.FF.FF	FF.FF.FF.FE	FF.FF.FF.FC	FF.FF.FF.F8	FF.FF.FF.F0	FF.FF.FF.E0	FF.FF.FF.C0	FF.FF.FF.80	FF.FF.FF.00
Binary	11111111	11111110	11111100	11111000	11110000	11100000	11000000	10000000	00000000
Legal Network Addresses	None	None	0, 4, 8, 12, 16, 20, 24, 28, 32, 36, 40, 44, 48, 52, 56, 60, 64, 68, 72, 76, 80, 84, 88, 92, 96, 100, 104, 108, 112, 116, 120, 124, 128, 132, 136, 140, 144, 148, 152, 156, 160, 164, 168, 172, 176, 180, 184, 188, 192, 196, 200, 204, 208, 212, 216, 220, 224, 228, 232, 236, 240, 244, 248, 252	0, 8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96, 104, 112, 120, 128, 136, 144, 152, 160, 168, 176, 184, 192, 200, 208, 216, 224, 232, 240, 248,	0, 16, 32, 48, 64, 80, 96, 112, 128, 144, 160, 176, 192, 208, 224, 240	0, 32, 64, 96, 128, 160, 192, 224	0, 64, 128, 192	0, 128	0

Netmask	CIDR	Etc
255.255.255.255	/32
255.255.255.254	/31
255.255.255.252	/30
255.255.255.248	/29
255.255.255.240	/28
255.255.255.224	/27
255.255.255.192	/26
255.255.255.128	/25
255.255.255.0	/24	1 Class C’s (Full Class C)
255.255.254.0	/23	2 Class C’s
255.255.252.0	/22	4 Class C’s
255.255.248.0	/21	8 Class C’s
255.255.240.0	/20	16 Class C’s
255.255.224.0	/19	32 Class C’s
255.255.192.0	/18	64 Class C’s
255.255.128.0	/17	128 Class C’s
255.255.0.0	/16	256 Class C’s (Full Class B)
255.254.0.0	/15	2 Class B’s
255.252.0.0	/14	4 Class B’s
255.248.0.0	/13	8 Class B’s
255.240.0.0	/12	16 Class B’s
255.224.0.0	/11	32 Class B’s
255.192.0.0	/10	64 Class B’s
255.128.0.0	/9	128 Class B’s
255.0.0.0	/8	256 Class B’s (Full Class A)