IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

Try:192.168.1.10/24 10.0.0.0/8 172.16.5.4/20 203.0.113.9/29

IPv6 calculator →

private IP (RFC 1918)10.0.8.0/24

network10.0.8.0/24

broadcast10.0.8.255

first host10.0.8.1

last host10.0.8.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.8.0/24

address00001010.00000000.00001000.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.00001000.00000000

broadcast00001010.00000000.00001000.11111111

green = network part, grey = host part

hex0x0a000800

decimal167774208

reverse dns0.8.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:800

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.8.0/31	10.0.8.0 – 10.0.8.1	10.0.8.1
2	10.0.8.2/31	10.0.8.2 – 10.0.8.3	10.0.8.3
3	10.0.8.4/31	10.0.8.4 – 10.0.8.5	10.0.8.5
4	10.0.8.6/31	10.0.8.6 – 10.0.8.7	10.0.8.7
5	10.0.8.8/31	10.0.8.8 – 10.0.8.9	10.0.8.9
6	10.0.8.10/31	10.0.8.10 – 10.0.8.11	10.0.8.11
7	10.0.8.12/31	10.0.8.12 – 10.0.8.13	10.0.8.13
8	10.0.8.14/31	10.0.8.14 – 10.0.8.15	10.0.8.15
9	10.0.8.16/31	10.0.8.16 – 10.0.8.17	10.0.8.17
10	10.0.8.18/31	10.0.8.18 – 10.0.8.19	10.0.8.19
11	10.0.8.20/31	10.0.8.20 – 10.0.8.21	10.0.8.21
12	10.0.8.22/31	10.0.8.22 – 10.0.8.23	10.0.8.23
13	10.0.8.24/31	10.0.8.24 – 10.0.8.25	10.0.8.25
14	10.0.8.26/31	10.0.8.26 – 10.0.8.27	10.0.8.27
15	10.0.8.28/31	10.0.8.28 – 10.0.8.29	10.0.8.29
16	10.0.8.30/31	10.0.8.30 – 10.0.8.31	10.0.8.31
17	10.0.8.32/31	10.0.8.32 – 10.0.8.33	10.0.8.33
18	10.0.8.34/31	10.0.8.34 – 10.0.8.35	10.0.8.35
19	10.0.8.36/31	10.0.8.36 – 10.0.8.37	10.0.8.37
20	10.0.8.38/31	10.0.8.38 – 10.0.8.39	10.0.8.39
21	10.0.8.40/31	10.0.8.40 – 10.0.8.41	10.0.8.41
22	10.0.8.42/31	10.0.8.42 – 10.0.8.43	10.0.8.43
23	10.0.8.44/31	10.0.8.44 – 10.0.8.45	10.0.8.45
24	10.0.8.46/31	10.0.8.46 – 10.0.8.47	10.0.8.47
25	10.0.8.48/31	10.0.8.48 – 10.0.8.49	10.0.8.49
26	10.0.8.50/31	10.0.8.50 – 10.0.8.51	10.0.8.51
27	10.0.8.52/31	10.0.8.52 – 10.0.8.53	10.0.8.53
28	10.0.8.54/31	10.0.8.54 – 10.0.8.55	10.0.8.55
29	10.0.8.56/31	10.0.8.56 – 10.0.8.57	10.0.8.57
30	10.0.8.58/31	10.0.8.58 – 10.0.8.59	10.0.8.59
31	10.0.8.60/31	10.0.8.60 – 10.0.8.61	10.0.8.61
32	10.0.8.62/31	10.0.8.62 – 10.0.8.63	10.0.8.63
33	10.0.8.64/31	10.0.8.64 – 10.0.8.65	10.0.8.65
34	10.0.8.66/31	10.0.8.66 – 10.0.8.67	10.0.8.67
35	10.0.8.68/31	10.0.8.68 – 10.0.8.69	10.0.8.69
36	10.0.8.70/31	10.0.8.70 – 10.0.8.71	10.0.8.71
37	10.0.8.72/31	10.0.8.72 – 10.0.8.73	10.0.8.73
38	10.0.8.74/31	10.0.8.74 – 10.0.8.75	10.0.8.75
39	10.0.8.76/31	10.0.8.76 – 10.0.8.77	10.0.8.77
40	10.0.8.78/31	10.0.8.78 – 10.0.8.79	10.0.8.79
41	10.0.8.80/31	10.0.8.80 – 10.0.8.81	10.0.8.81
42	10.0.8.82/31	10.0.8.82 – 10.0.8.83	10.0.8.83
43	10.0.8.84/31	10.0.8.84 – 10.0.8.85	10.0.8.85
44	10.0.8.86/31	10.0.8.86 – 10.0.8.87	10.0.8.87
45	10.0.8.88/31	10.0.8.88 – 10.0.8.89	10.0.8.89
46	10.0.8.90/31	10.0.8.90 – 10.0.8.91	10.0.8.91
47	10.0.8.92/31	10.0.8.92 – 10.0.8.93	10.0.8.93
48	10.0.8.94/31	10.0.8.94 – 10.0.8.95	10.0.8.95
49	10.0.8.96/31	10.0.8.96 – 10.0.8.97	10.0.8.97
50	10.0.8.98/31	10.0.8.98 – 10.0.8.99	10.0.8.99
51	10.0.8.100/31	10.0.8.100 – 10.0.8.101	10.0.8.101
52	10.0.8.102/31	10.0.8.102 – 10.0.8.103	10.0.8.103
53	10.0.8.104/31	10.0.8.104 – 10.0.8.105	10.0.8.105
54	10.0.8.106/31	10.0.8.106 – 10.0.8.107	10.0.8.107
55	10.0.8.108/31	10.0.8.108 – 10.0.8.109	10.0.8.109
56	10.0.8.110/31	10.0.8.110 – 10.0.8.111	10.0.8.111
57	10.0.8.112/31	10.0.8.112 – 10.0.8.113	10.0.8.113
58	10.0.8.114/31	10.0.8.114 – 10.0.8.115	10.0.8.115
59	10.0.8.116/31	10.0.8.116 – 10.0.8.117	10.0.8.117
60	10.0.8.118/31	10.0.8.118 – 10.0.8.119	10.0.8.119
61	10.0.8.120/31	10.0.8.120 – 10.0.8.121	10.0.8.121
62	10.0.8.122/31	10.0.8.122 – 10.0.8.123	10.0.8.123
63	10.0.8.124/31	10.0.8.124 – 10.0.8.125	10.0.8.125
64	10.0.8.126/31	10.0.8.126 – 10.0.8.127	10.0.8.127
65	10.0.8.128/31	10.0.8.128 – 10.0.8.129	10.0.8.129
66	10.0.8.130/31	10.0.8.130 – 10.0.8.131	10.0.8.131
67	10.0.8.132/31	10.0.8.132 – 10.0.8.133	10.0.8.133
68	10.0.8.134/31	10.0.8.134 – 10.0.8.135	10.0.8.135
69	10.0.8.136/31	10.0.8.136 – 10.0.8.137	10.0.8.137
70	10.0.8.138/31	10.0.8.138 – 10.0.8.139	10.0.8.139
71	10.0.8.140/31	10.0.8.140 – 10.0.8.141	10.0.8.141
72	10.0.8.142/31	10.0.8.142 – 10.0.8.143	10.0.8.143
73	10.0.8.144/31	10.0.8.144 – 10.0.8.145	10.0.8.145
74	10.0.8.146/31	10.0.8.146 – 10.0.8.147	10.0.8.147
75	10.0.8.148/31	10.0.8.148 – 10.0.8.149	10.0.8.149
76	10.0.8.150/31	10.0.8.150 – 10.0.8.151	10.0.8.151
77	10.0.8.152/31	10.0.8.152 – 10.0.8.153	10.0.8.153
78	10.0.8.154/31	10.0.8.154 – 10.0.8.155	10.0.8.155
79	10.0.8.156/31	10.0.8.156 – 10.0.8.157	10.0.8.157
80	10.0.8.158/31	10.0.8.158 – 10.0.8.159	10.0.8.159
81	10.0.8.160/31	10.0.8.160 – 10.0.8.161	10.0.8.161
82	10.0.8.162/31	10.0.8.162 – 10.0.8.163	10.0.8.163
83	10.0.8.164/31	10.0.8.164 – 10.0.8.165	10.0.8.165
84	10.0.8.166/31	10.0.8.166 – 10.0.8.167	10.0.8.167
85	10.0.8.168/31	10.0.8.168 – 10.0.8.169	10.0.8.169
86	10.0.8.170/31	10.0.8.170 – 10.0.8.171	10.0.8.171
87	10.0.8.172/31	10.0.8.172 – 10.0.8.173	10.0.8.173
88	10.0.8.174/31	10.0.8.174 – 10.0.8.175	10.0.8.175
89	10.0.8.176/31	10.0.8.176 – 10.0.8.177	10.0.8.177
90	10.0.8.178/31	10.0.8.178 – 10.0.8.179	10.0.8.179
91	10.0.8.180/31	10.0.8.180 – 10.0.8.181	10.0.8.181
92	10.0.8.182/31	10.0.8.182 – 10.0.8.183	10.0.8.183
93	10.0.8.184/31	10.0.8.184 – 10.0.8.185	10.0.8.185
94	10.0.8.186/31	10.0.8.186 – 10.0.8.187	10.0.8.187
95	10.0.8.188/31	10.0.8.188 – 10.0.8.189	10.0.8.189
96	10.0.8.190/31	10.0.8.190 – 10.0.8.191	10.0.8.191
97	10.0.8.192/31	10.0.8.192 – 10.0.8.193	10.0.8.193
98	10.0.8.194/31	10.0.8.194 – 10.0.8.195	10.0.8.195
99	10.0.8.196/31	10.0.8.196 – 10.0.8.197	10.0.8.197
100	10.0.8.198/31	10.0.8.198 – 10.0.8.199	10.0.8.199
101	10.0.8.200/31	10.0.8.200 – 10.0.8.201	10.0.8.201
102	10.0.8.202/31	10.0.8.202 – 10.0.8.203	10.0.8.203
103	10.0.8.204/31	10.0.8.204 – 10.0.8.205	10.0.8.205
104	10.0.8.206/31	10.0.8.206 – 10.0.8.207	10.0.8.207
105	10.0.8.208/31	10.0.8.208 – 10.0.8.209	10.0.8.209
106	10.0.8.210/31	10.0.8.210 – 10.0.8.211	10.0.8.211
107	10.0.8.212/31	10.0.8.212 – 10.0.8.213	10.0.8.213
108	10.0.8.214/31	10.0.8.214 – 10.0.8.215	10.0.8.215
109	10.0.8.216/31	10.0.8.216 – 10.0.8.217	10.0.8.217
110	10.0.8.218/31	10.0.8.218 – 10.0.8.219	10.0.8.219
111	10.0.8.220/31	10.0.8.220 – 10.0.8.221	10.0.8.221
112	10.0.8.222/31	10.0.8.222 – 10.0.8.223	10.0.8.223
113	10.0.8.224/31	10.0.8.224 – 10.0.8.225	10.0.8.225
114	10.0.8.226/31	10.0.8.226 – 10.0.8.227	10.0.8.227
115	10.0.8.228/31	10.0.8.228 – 10.0.8.229	10.0.8.229
116	10.0.8.230/31	10.0.8.230 – 10.0.8.231	10.0.8.231
117	10.0.8.232/31	10.0.8.232 – 10.0.8.233	10.0.8.233
118	10.0.8.234/31	10.0.8.234 – 10.0.8.235	10.0.8.235
119	10.0.8.236/31	10.0.8.236 – 10.0.8.237	10.0.8.237
120	10.0.8.238/31	10.0.8.238 – 10.0.8.239	10.0.8.239
121	10.0.8.240/31	10.0.8.240 – 10.0.8.241	10.0.8.241
122	10.0.8.242/31	10.0.8.242 – 10.0.8.243	10.0.8.243
123	10.0.8.244/31	10.0.8.244 – 10.0.8.245	10.0.8.245
124	10.0.8.246/31	10.0.8.246 – 10.0.8.247	10.0.8.247
125	10.0.8.248/31	10.0.8.248 – 10.0.8.249	10.0.8.249
126	10.0.8.250/31	10.0.8.250 – 10.0.8.251	10.0.8.251
127	10.0.8.252/31	10.0.8.252 – 10.0.8.253	10.0.8.253
128	10.0.8.254/31	10.0.8.254 – 10.0.8.255	10.0.8.255

01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefix	subnet mask	addresses	hosts	in your /24
/0	0.0.0.0	4,294,967,296	4,294,967,294	-
/1	128.0.0.0	2,147,483,648	2,147,483,646	-
/2	192.0.0.0	1,073,741,824	1,073,741,822	-
/3	224.0.0.0	536,870,912	536,870,910	-
/4	240.0.0.0	268,435,456	268,435,454	-
/5	248.0.0.0	134,217,728	134,217,726	-
/6	252.0.0.0	67,108,864	67,108,862	-
/7	254.0.0.0	33,554,432	33,554,430	-
/8	255.0.0.0	16,777,216	16,777,214	-
/9	255.128.0.0	8,388,608	8,388,606	-
/10	255.192.0.0	4,194,304	4,194,302	-
/11	255.224.0.0	2,097,152	2,097,150	-
/12	255.240.0.0	1,048,576	1,048,574	-
/13	255.248.0.0	524,288	524,286	-
/14	255.252.0.0	262,144	262,142	-
/15	255.254.0.0	131,072	131,070	-
/16	255.255.0.0	65,536	65,534	-
/17	255.255.128.0	32,768	32,766	-
/18	255.255.192.0	16,384	16,382	-
/19	255.255.224.0	8,192	8,190	-
/20	255.255.240.0	4,096	4,094	-
/21	255.255.248.0	2,048	2,046	-
/22	255.255.252.0	1,024	1,022	-
/23	255.255.254.0	512	510	-
/24	255.255.255.0	256	254	1
/25	255.255.255.128	128	126	2 split →
/26	255.255.255.192	64	62	4 split →
/27	255.255.255.224	32	30	8 split →
/28	255.255.255.240	16	14	16 split →
/29	255.255.255.248	8	6	32 split →
/30	255.255.255.252	4	2	64 split →
/31	255.255.255.254	2	2	128 split →
/32	255.255.255.255	1	1	256 split →

02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →