IP Addressing

IP VLSM Diagram Classfull Addresses Private Addresses Classless Subnets /24 - /28 /29 /30 Classless Supernets

Classless Subnets: /24 - /28

Subnetting is the process of borrowing bits from the host portion of the address. (See IP VLSM Diagram)

The following tables show class C subnetting in classless form with the number of usable hosts and ranges for /24 - /28 subnets.

/24   /25   /26   /27   /28   /29   /30

Private IP Address Ranges (RFC 1918)

/24 IP Bit Mask
Dotted Decimal Mask: 255.255.255.0 Hexadecimal Mask: FF.FF.FF.00 Effective Hosts: 254 Effective Subnets: 1
Network Number	Broadcast	Usable IP Range	Usable IPs /subnet
0	255	1-254	254

/25 IP Bit Mask
Dotted Decimal Mask: 255.255.255.128 Hexadecimal Mask: FF.FF.FF.80 Effective Hosts: 252 Effective Subnets: 2
Network Number	Broadcast	Usable IP Range	Usable IPs /subnet
0	127	1-126	126
128	255	129-254	126

/26 IP Bit Mask
Dotted Decimal Mask: 255.255.255.192 Hexadecimal Mask: FF.FF.FF.C0 Effective Hosts: 248 Effective Subnets: 4
Network Number	Broadcast	Usable IP Range	Usable IPs /subnet
0	63	1 - 62	62
64	127	65 - 126	62
128	191	129 - 190	62
192	255	193 - 254	62

/24   /25   /26   /27   /28   /29   /30

/27 IP Bit Mask
Dotted Decimal Mask: 255.255.255.224 Hexadecimal Mask: FF.FF.FF.E0 Effective Hosts: 240 Effective Subnets: 8
Network Number	Broadcast	Usable IP Range	Usable IPs /subnet
0	31	1 - 30	30
32	63	33 - 62	30
64	95	65 - 94	30
96	127	97 - 126	30
128	159	129 - 158	30
160	191	161 - 190	30
192	223	193 - 222	30
224	255	225 - 254	30

/24   /25   /26   /27   /28   /29   /30

/28 IP Bit Mask
Dotted Decimal Mask: 255.255.255.240 Hexadecimal Mask: FF.FF.FF.F0 Effective Hosts: 224 Effective Subnets: 16
Network Number	Broadcast	Usable IP Range	Usable IPs /subnet
0	15	1 - 14	14
16	31	17 - 30	14
32	47	33-46	14
48	63	49-62	14
64	79	65-78	14
80	95	81-94	14
96	111	97-110	14
112	127	113-126	14
128	143	129-142	14
144	159	145-158	14
160	175	161-174	14
176	191	177-190	14
192	207	193-206	14
208	223	209-222	14
224	239	225-238	14
240	255	241-254	14

/24   /25   /26   /27   /28   /29   /30

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