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)10.0.0.0/24

network10.0.0.0/24

broadcast10.0.0.255

first host10.0.0.1

last host10.0.0.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.0.0/24

address00001010.00000000.00000000.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.00000000.00000000

broadcast00001010.00000000.00000000.11111111

green = network part, grey = host part

hex0x0a000000

decimal167772160

reverse dns0.0.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:0

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.0.0/31	10.0.0.0 – 10.0.0.1	10.0.0.1
2	10.0.0.2/31	10.0.0.2 – 10.0.0.3	10.0.0.3
3	10.0.0.4/31	10.0.0.4 – 10.0.0.5	10.0.0.5
4	10.0.0.6/31	10.0.0.6 – 10.0.0.7	10.0.0.7
5	10.0.0.8/31	10.0.0.8 – 10.0.0.9	10.0.0.9
6	10.0.0.10/31	10.0.0.10 – 10.0.0.11	10.0.0.11
7	10.0.0.12/31	10.0.0.12 – 10.0.0.13	10.0.0.13
8	10.0.0.14/31	10.0.0.14 – 10.0.0.15	10.0.0.15
9	10.0.0.16/31	10.0.0.16 – 10.0.0.17	10.0.0.17
10	10.0.0.18/31	10.0.0.18 – 10.0.0.19	10.0.0.19
11	10.0.0.20/31	10.0.0.20 – 10.0.0.21	10.0.0.21
12	10.0.0.22/31	10.0.0.22 – 10.0.0.23	10.0.0.23
13	10.0.0.24/31	10.0.0.24 – 10.0.0.25	10.0.0.25
14	10.0.0.26/31	10.0.0.26 – 10.0.0.27	10.0.0.27
15	10.0.0.28/31	10.0.0.28 – 10.0.0.29	10.0.0.29
16	10.0.0.30/31	10.0.0.30 – 10.0.0.31	10.0.0.31
17	10.0.0.32/31	10.0.0.32 – 10.0.0.33	10.0.0.33
18	10.0.0.34/31	10.0.0.34 – 10.0.0.35	10.0.0.35
19	10.0.0.36/31	10.0.0.36 – 10.0.0.37	10.0.0.37
20	10.0.0.38/31	10.0.0.38 – 10.0.0.39	10.0.0.39
21	10.0.0.40/31	10.0.0.40 – 10.0.0.41	10.0.0.41
22	10.0.0.42/31	10.0.0.42 – 10.0.0.43	10.0.0.43
23	10.0.0.44/31	10.0.0.44 – 10.0.0.45	10.0.0.45
24	10.0.0.46/31	10.0.0.46 – 10.0.0.47	10.0.0.47
25	10.0.0.48/31	10.0.0.48 – 10.0.0.49	10.0.0.49
26	10.0.0.50/31	10.0.0.50 – 10.0.0.51	10.0.0.51
27	10.0.0.52/31	10.0.0.52 – 10.0.0.53	10.0.0.53
28	10.0.0.54/31	10.0.0.54 – 10.0.0.55	10.0.0.55
29	10.0.0.56/31	10.0.0.56 – 10.0.0.57	10.0.0.57
30	10.0.0.58/31	10.0.0.58 – 10.0.0.59	10.0.0.59
31	10.0.0.60/31	10.0.0.60 – 10.0.0.61	10.0.0.61
32	10.0.0.62/31	10.0.0.62 – 10.0.0.63	10.0.0.63
33	10.0.0.64/31	10.0.0.64 – 10.0.0.65	10.0.0.65
34	10.0.0.66/31	10.0.0.66 – 10.0.0.67	10.0.0.67
35	10.0.0.68/31	10.0.0.68 – 10.0.0.69	10.0.0.69
36	10.0.0.70/31	10.0.0.70 – 10.0.0.71	10.0.0.71
37	10.0.0.72/31	10.0.0.72 – 10.0.0.73	10.0.0.73
38	10.0.0.74/31	10.0.0.74 – 10.0.0.75	10.0.0.75
39	10.0.0.76/31	10.0.0.76 – 10.0.0.77	10.0.0.77
40	10.0.0.78/31	10.0.0.78 – 10.0.0.79	10.0.0.79
41	10.0.0.80/31	10.0.0.80 – 10.0.0.81	10.0.0.81
42	10.0.0.82/31	10.0.0.82 – 10.0.0.83	10.0.0.83
43	10.0.0.84/31	10.0.0.84 – 10.0.0.85	10.0.0.85
44	10.0.0.86/31	10.0.0.86 – 10.0.0.87	10.0.0.87
45	10.0.0.88/31	10.0.0.88 – 10.0.0.89	10.0.0.89
46	10.0.0.90/31	10.0.0.90 – 10.0.0.91	10.0.0.91
47	10.0.0.92/31	10.0.0.92 – 10.0.0.93	10.0.0.93
48	10.0.0.94/31	10.0.0.94 – 10.0.0.95	10.0.0.95
49	10.0.0.96/31	10.0.0.96 – 10.0.0.97	10.0.0.97
50	10.0.0.98/31	10.0.0.98 – 10.0.0.99	10.0.0.99
51	10.0.0.100/31	10.0.0.100 – 10.0.0.101	10.0.0.101
52	10.0.0.102/31	10.0.0.102 – 10.0.0.103	10.0.0.103
53	10.0.0.104/31	10.0.0.104 – 10.0.0.105	10.0.0.105
54	10.0.0.106/31	10.0.0.106 – 10.0.0.107	10.0.0.107
55	10.0.0.108/31	10.0.0.108 – 10.0.0.109	10.0.0.109
56	10.0.0.110/31	10.0.0.110 – 10.0.0.111	10.0.0.111
57	10.0.0.112/31	10.0.0.112 – 10.0.0.113	10.0.0.113
58	10.0.0.114/31	10.0.0.114 – 10.0.0.115	10.0.0.115
59	10.0.0.116/31	10.0.0.116 – 10.0.0.117	10.0.0.117
60	10.0.0.118/31	10.0.0.118 – 10.0.0.119	10.0.0.119
61	10.0.0.120/31	10.0.0.120 – 10.0.0.121	10.0.0.121
62	10.0.0.122/31	10.0.0.122 – 10.0.0.123	10.0.0.123
63	10.0.0.124/31	10.0.0.124 – 10.0.0.125	10.0.0.125
64	10.0.0.126/31	10.0.0.126 – 10.0.0.127	10.0.0.127
65	10.0.0.128/31	10.0.0.128 – 10.0.0.129	10.0.0.129
66	10.0.0.130/31	10.0.0.130 – 10.0.0.131	10.0.0.131
67	10.0.0.132/31	10.0.0.132 – 10.0.0.133	10.0.0.133
68	10.0.0.134/31	10.0.0.134 – 10.0.0.135	10.0.0.135
69	10.0.0.136/31	10.0.0.136 – 10.0.0.137	10.0.0.137
70	10.0.0.138/31	10.0.0.138 – 10.0.0.139	10.0.0.139
71	10.0.0.140/31	10.0.0.140 – 10.0.0.141	10.0.0.141
72	10.0.0.142/31	10.0.0.142 – 10.0.0.143	10.0.0.143
73	10.0.0.144/31	10.0.0.144 – 10.0.0.145	10.0.0.145
74	10.0.0.146/31	10.0.0.146 – 10.0.0.147	10.0.0.147
75	10.0.0.148/31	10.0.0.148 – 10.0.0.149	10.0.0.149
76	10.0.0.150/31	10.0.0.150 – 10.0.0.151	10.0.0.151
77	10.0.0.152/31	10.0.0.152 – 10.0.0.153	10.0.0.153
78	10.0.0.154/31	10.0.0.154 – 10.0.0.155	10.0.0.155
79	10.0.0.156/31	10.0.0.156 – 10.0.0.157	10.0.0.157
80	10.0.0.158/31	10.0.0.158 – 10.0.0.159	10.0.0.159
81	10.0.0.160/31	10.0.0.160 – 10.0.0.161	10.0.0.161
82	10.0.0.162/31	10.0.0.162 – 10.0.0.163	10.0.0.163
83	10.0.0.164/31	10.0.0.164 – 10.0.0.165	10.0.0.165
84	10.0.0.166/31	10.0.0.166 – 10.0.0.167	10.0.0.167
85	10.0.0.168/31	10.0.0.168 – 10.0.0.169	10.0.0.169
86	10.0.0.170/31	10.0.0.170 – 10.0.0.171	10.0.0.171
87	10.0.0.172/31	10.0.0.172 – 10.0.0.173	10.0.0.173
88	10.0.0.174/31	10.0.0.174 – 10.0.0.175	10.0.0.175
89	10.0.0.176/31	10.0.0.176 – 10.0.0.177	10.0.0.177
90	10.0.0.178/31	10.0.0.178 – 10.0.0.179	10.0.0.179
91	10.0.0.180/31	10.0.0.180 – 10.0.0.181	10.0.0.181
92	10.0.0.182/31	10.0.0.182 – 10.0.0.183	10.0.0.183
93	10.0.0.184/31	10.0.0.184 – 10.0.0.185	10.0.0.185
94	10.0.0.186/31	10.0.0.186 – 10.0.0.187	10.0.0.187
95	10.0.0.188/31	10.0.0.188 – 10.0.0.189	10.0.0.189
96	10.0.0.190/31	10.0.0.190 – 10.0.0.191	10.0.0.191
97	10.0.0.192/31	10.0.0.192 – 10.0.0.193	10.0.0.193
98	10.0.0.194/31	10.0.0.194 – 10.0.0.195	10.0.0.195
99	10.0.0.196/31	10.0.0.196 – 10.0.0.197	10.0.0.197
100	10.0.0.198/31	10.0.0.198 – 10.0.0.199	10.0.0.199
101	10.0.0.200/31	10.0.0.200 – 10.0.0.201	10.0.0.201
102	10.0.0.202/31	10.0.0.202 – 10.0.0.203	10.0.0.203
103	10.0.0.204/31	10.0.0.204 – 10.0.0.205	10.0.0.205
104	10.0.0.206/31	10.0.0.206 – 10.0.0.207	10.0.0.207
105	10.0.0.208/31	10.0.0.208 – 10.0.0.209	10.0.0.209
106	10.0.0.210/31	10.0.0.210 – 10.0.0.211	10.0.0.211
107	10.0.0.212/31	10.0.0.212 – 10.0.0.213	10.0.0.213
108	10.0.0.214/31	10.0.0.214 – 10.0.0.215	10.0.0.215
109	10.0.0.216/31	10.0.0.216 – 10.0.0.217	10.0.0.217
110	10.0.0.218/31	10.0.0.218 – 10.0.0.219	10.0.0.219
111	10.0.0.220/31	10.0.0.220 – 10.0.0.221	10.0.0.221
112	10.0.0.222/31	10.0.0.222 – 10.0.0.223	10.0.0.223
113	10.0.0.224/31	10.0.0.224 – 10.0.0.225	10.0.0.225
114	10.0.0.226/31	10.0.0.226 – 10.0.0.227	10.0.0.227
115	10.0.0.228/31	10.0.0.228 – 10.0.0.229	10.0.0.229
116	10.0.0.230/31	10.0.0.230 – 10.0.0.231	10.0.0.231
117	10.0.0.232/31	10.0.0.232 – 10.0.0.233	10.0.0.233
118	10.0.0.234/31	10.0.0.234 – 10.0.0.235	10.0.0.235
119	10.0.0.236/31	10.0.0.236 – 10.0.0.237	10.0.0.237
120	10.0.0.238/31	10.0.0.238 – 10.0.0.239	10.0.0.239
121	10.0.0.240/31	10.0.0.240 – 10.0.0.241	10.0.0.241
122	10.0.0.242/31	10.0.0.242 – 10.0.0.243	10.0.0.243
123	10.0.0.244/31	10.0.0.244 – 10.0.0.245	10.0.0.245
124	10.0.0.246/31	10.0.0.246 – 10.0.0.247	10.0.0.247
125	10.0.0.248/31	10.0.0.248 – 10.0.0.249	10.0.0.249
126	10.0.0.250/31	10.0.0.250 – 10.0.0.251	10.0.0.251
127	10.0.0.252/31	10.0.0.252 – 10.0.0.253	10.0.0.253
128	10.0.0.254/31	10.0.0.254 – 10.0.0.255	10.0.0.255

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 →