인터넷 프로토콜 서브넷 차트(IPv4)

서브넷 네트워크를 필요시 빠르게 작업하기 위해 기록 해둠.

서브넷 규악은 RFC 1817그리고 RFC 1812 에 따름.

Class address ranges:

• Class A = 1.0.0.0 to 126.0.0.0
• Class B = 128.0.0.0 to 191.255.0.0
• Class C = 192.0.1.0 to 223.255.255.0

 

Reserved address ranges for private (non-routed) use (see RFC 1918):

• 10.0.0.0 -> 10.255.255.255
• 172.16.0.0 -> 172.31.255.255
• 192.168.0.0 -> 192.168.255.255

 

Other reserved addresses:

• 127.0.0.0 is reserved for loopback and IPC on the local host
• 224.0.0.0 -> 239.255.255.255 is reserved for multicast addresses

 

Chart notes:

• Number of Subnets - "( )" Refers to the number of effective subnets, since the use of subnet numbers of all 0s or all 1s is highly frowned upon and RFC non-compliant.
• Number of Hosts - Refers to the number of effective hosts, excluding the network and broadcast address.

 

Class A

Network Bits	Subnet Mask	Number of Subnets	Number of Hosts
/8	255.0.0.0	0	16777214
/9	255.128.0.0	2 (0)	8388606
/10	255.192.0.0	4 (2)	4194302
/11	255.224.0.0	8 (6)	2097150
/12	255.240.0.0	16 (14)	1048574
/13	255.248.0.0	32 (30)	524286
/14	255.252.0.0	64 (62)	262142
/15	255.254.0.0	128 (126)	131070
/16	255.255.0.0	256 (254)	65534
/17	255.255.128.0	512 (510)	32766
/18	255.255.192.0	1024 (1022)	16382
/19	255.255.224.0	2048 (2046)	8190
/20	255.255.240.0	4096 (4094)	4094
/21	255.255.248.0	8192 (8190)	2046
/22	255.255.252.0	16384 (16382)	1022
/23	255.255.254.0	32768 (32766)	510
/24	255.255.255.0	65536 (65534)	254
/25	255.255.255.128	131072 (131070)	126
/26	255.255.255.192	262144 (262142)	62
/27	255.255.255.224	524288 (524286)	30
/28	255.255.255.240	1048576 (1048574)	14
/29	255.255.255.248	2097152 (2097150)	6
/30	255.255.255.252	4194304 (4194302)	2

 

Class B

Network Bits	Subnet Mask	Number of Subnets	Number of Hosts
/16	255.255.0.0	0	65534
/17	255.255.128.0	2 (0)	32766
/18	255.255.192.0	4 (2)	16382
/19	255.255.224.0	8 (6)	8190
/20	255.255.240.0	16 (14)	4094
/21	255.255.248.0	32 (30)	2046
/22	255.255.252.0	64 (62)	1022
/23	255.255.254.0	128 (126)	510
/24	255.255.255.0	256 (254)	254
/25	255.255.255.128	512 (510)	126
/26	255.255.255.192	1024 (1022)	62
/27	255.255.255.224	2048 (2046)	30
/28	255.255.255.240	4096 (4094)	14
/29	255.255.255.248	8192 (8190)	6
/30	255.255.255.252	16384 (16382)	2

 

Class C

Network Bits	Subnet Mask	Number of Subnets	Number of Hosts
/24	255.255.255.0	0	254
/25	255.255.255.128	2 (0)	126
/26	255.255.255.192	4 (2)	62
/27	255.255.255.224	8 (6)	30
/28	255.255.255.240	16 (14)	14
/29	255.255.255.248	32 (30)	6
/30	255.255.255.252	64 (62)	2

---

Supernetting (CIDR) Chart 

• CIDR - Classless Inter-Domain Routing.
• Note: The Number of Class C networks must be contiguous.
  For example, 192.169.1.0/22 represents the following block of addresses:
  192.169.1.0, 192.169.2.0, 192.169.3.0 and 192.169.4.0.

Class C

CIDR Block	Supernet Mask	Number of Class C Addresses	Number of Hosts
/14	255.252.0.0	1024	262144
/15	255.254.0.0	512	131072
/16	255.255.0.0	256	65536
/17	255.255.128.0	128	32768
/18	255.255.192.0	64	16384
/19	255.255.224.0	32	8192
/20	255.255.240.0	16	4096
/21	255.255.248.0	8	2048
/22	255.255.252.0	4	1024
/23	255.255.254.0	2	512