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)10.0.2.0/24

network10.0.2.0/24

broadcast10.0.2.255

first host10.0.2.1

last host10.0.2.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.2.0/24

address00001010.00000000.00000010.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.00000010.00000000

broadcast00001010.00000000.00000010.11111111

green = network part, grey = host part

hex0x0a000200

decimal167772672

reverse dns0.2.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:200

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.2.0/31	10.0.2.0 – 10.0.2.1	10.0.2.1
2	10.0.2.2/31	10.0.2.2 – 10.0.2.3	10.0.2.3
3	10.0.2.4/31	10.0.2.4 – 10.0.2.5	10.0.2.5
4	10.0.2.6/31	10.0.2.6 – 10.0.2.7	10.0.2.7
5	10.0.2.8/31	10.0.2.8 – 10.0.2.9	10.0.2.9
6	10.0.2.10/31	10.0.2.10 – 10.0.2.11	10.0.2.11
7	10.0.2.12/31	10.0.2.12 – 10.0.2.13	10.0.2.13
8	10.0.2.14/31	10.0.2.14 – 10.0.2.15	10.0.2.15
9	10.0.2.16/31	10.0.2.16 – 10.0.2.17	10.0.2.17
10	10.0.2.18/31	10.0.2.18 – 10.0.2.19	10.0.2.19
11	10.0.2.20/31	10.0.2.20 – 10.0.2.21	10.0.2.21
12	10.0.2.22/31	10.0.2.22 – 10.0.2.23	10.0.2.23
13	10.0.2.24/31	10.0.2.24 – 10.0.2.25	10.0.2.25
14	10.0.2.26/31	10.0.2.26 – 10.0.2.27	10.0.2.27
15	10.0.2.28/31	10.0.2.28 – 10.0.2.29	10.0.2.29
16	10.0.2.30/31	10.0.2.30 – 10.0.2.31	10.0.2.31
17	10.0.2.32/31	10.0.2.32 – 10.0.2.33	10.0.2.33
18	10.0.2.34/31	10.0.2.34 – 10.0.2.35	10.0.2.35
19	10.0.2.36/31	10.0.2.36 – 10.0.2.37	10.0.2.37
20	10.0.2.38/31	10.0.2.38 – 10.0.2.39	10.0.2.39
21	10.0.2.40/31	10.0.2.40 – 10.0.2.41	10.0.2.41
22	10.0.2.42/31	10.0.2.42 – 10.0.2.43	10.0.2.43
23	10.0.2.44/31	10.0.2.44 – 10.0.2.45	10.0.2.45
24	10.0.2.46/31	10.0.2.46 – 10.0.2.47	10.0.2.47
25	10.0.2.48/31	10.0.2.48 – 10.0.2.49	10.0.2.49
26	10.0.2.50/31	10.0.2.50 – 10.0.2.51	10.0.2.51
27	10.0.2.52/31	10.0.2.52 – 10.0.2.53	10.0.2.53
28	10.0.2.54/31	10.0.2.54 – 10.0.2.55	10.0.2.55
29	10.0.2.56/31	10.0.2.56 – 10.0.2.57	10.0.2.57
30	10.0.2.58/31	10.0.2.58 – 10.0.2.59	10.0.2.59
31	10.0.2.60/31	10.0.2.60 – 10.0.2.61	10.0.2.61
32	10.0.2.62/31	10.0.2.62 – 10.0.2.63	10.0.2.63
33	10.0.2.64/31	10.0.2.64 – 10.0.2.65	10.0.2.65
34	10.0.2.66/31	10.0.2.66 – 10.0.2.67	10.0.2.67
35	10.0.2.68/31	10.0.2.68 – 10.0.2.69	10.0.2.69
36	10.0.2.70/31	10.0.2.70 – 10.0.2.71	10.0.2.71
37	10.0.2.72/31	10.0.2.72 – 10.0.2.73	10.0.2.73
38	10.0.2.74/31	10.0.2.74 – 10.0.2.75	10.0.2.75
39	10.0.2.76/31	10.0.2.76 – 10.0.2.77	10.0.2.77
40	10.0.2.78/31	10.0.2.78 – 10.0.2.79	10.0.2.79
41	10.0.2.80/31	10.0.2.80 – 10.0.2.81	10.0.2.81
42	10.0.2.82/31	10.0.2.82 – 10.0.2.83	10.0.2.83
43	10.0.2.84/31	10.0.2.84 – 10.0.2.85	10.0.2.85
44	10.0.2.86/31	10.0.2.86 – 10.0.2.87	10.0.2.87
45	10.0.2.88/31	10.0.2.88 – 10.0.2.89	10.0.2.89
46	10.0.2.90/31	10.0.2.90 – 10.0.2.91	10.0.2.91
47	10.0.2.92/31	10.0.2.92 – 10.0.2.93	10.0.2.93
48	10.0.2.94/31	10.0.2.94 – 10.0.2.95	10.0.2.95
49	10.0.2.96/31	10.0.2.96 – 10.0.2.97	10.0.2.97
50	10.0.2.98/31	10.0.2.98 – 10.0.2.99	10.0.2.99
51	10.0.2.100/31	10.0.2.100 – 10.0.2.101	10.0.2.101
52	10.0.2.102/31	10.0.2.102 – 10.0.2.103	10.0.2.103
53	10.0.2.104/31	10.0.2.104 – 10.0.2.105	10.0.2.105
54	10.0.2.106/31	10.0.2.106 – 10.0.2.107	10.0.2.107
55	10.0.2.108/31	10.0.2.108 – 10.0.2.109	10.0.2.109
56	10.0.2.110/31	10.0.2.110 – 10.0.2.111	10.0.2.111
57	10.0.2.112/31	10.0.2.112 – 10.0.2.113	10.0.2.113
58	10.0.2.114/31	10.0.2.114 – 10.0.2.115	10.0.2.115
59	10.0.2.116/31	10.0.2.116 – 10.0.2.117	10.0.2.117
60	10.0.2.118/31	10.0.2.118 – 10.0.2.119	10.0.2.119
61	10.0.2.120/31	10.0.2.120 – 10.0.2.121	10.0.2.121
62	10.0.2.122/31	10.0.2.122 – 10.0.2.123	10.0.2.123
63	10.0.2.124/31	10.0.2.124 – 10.0.2.125	10.0.2.125
64	10.0.2.126/31	10.0.2.126 – 10.0.2.127	10.0.2.127
65	10.0.2.128/31	10.0.2.128 – 10.0.2.129	10.0.2.129
66	10.0.2.130/31	10.0.2.130 – 10.0.2.131	10.0.2.131
67	10.0.2.132/31	10.0.2.132 – 10.0.2.133	10.0.2.133
68	10.0.2.134/31	10.0.2.134 – 10.0.2.135	10.0.2.135
69	10.0.2.136/31	10.0.2.136 – 10.0.2.137	10.0.2.137
70	10.0.2.138/31	10.0.2.138 – 10.0.2.139	10.0.2.139
71	10.0.2.140/31	10.0.2.140 – 10.0.2.141	10.0.2.141
72	10.0.2.142/31	10.0.2.142 – 10.0.2.143	10.0.2.143
73	10.0.2.144/31	10.0.2.144 – 10.0.2.145	10.0.2.145
74	10.0.2.146/31	10.0.2.146 – 10.0.2.147	10.0.2.147
75	10.0.2.148/31	10.0.2.148 – 10.0.2.149	10.0.2.149
76	10.0.2.150/31	10.0.2.150 – 10.0.2.151	10.0.2.151
77	10.0.2.152/31	10.0.2.152 – 10.0.2.153	10.0.2.153
78	10.0.2.154/31	10.0.2.154 – 10.0.2.155	10.0.2.155
79	10.0.2.156/31	10.0.2.156 – 10.0.2.157	10.0.2.157
80	10.0.2.158/31	10.0.2.158 – 10.0.2.159	10.0.2.159
81	10.0.2.160/31	10.0.2.160 – 10.0.2.161	10.0.2.161
82	10.0.2.162/31	10.0.2.162 – 10.0.2.163	10.0.2.163
83	10.0.2.164/31	10.0.2.164 – 10.0.2.165	10.0.2.165
84	10.0.2.166/31	10.0.2.166 – 10.0.2.167	10.0.2.167
85	10.0.2.168/31	10.0.2.168 – 10.0.2.169	10.0.2.169
86	10.0.2.170/31	10.0.2.170 – 10.0.2.171	10.0.2.171
87	10.0.2.172/31	10.0.2.172 – 10.0.2.173	10.0.2.173
88	10.0.2.174/31	10.0.2.174 – 10.0.2.175	10.0.2.175
89	10.0.2.176/31	10.0.2.176 – 10.0.2.177	10.0.2.177
90	10.0.2.178/31	10.0.2.178 – 10.0.2.179	10.0.2.179
91	10.0.2.180/31	10.0.2.180 – 10.0.2.181	10.0.2.181
92	10.0.2.182/31	10.0.2.182 – 10.0.2.183	10.0.2.183
93	10.0.2.184/31	10.0.2.184 – 10.0.2.185	10.0.2.185
94	10.0.2.186/31	10.0.2.186 – 10.0.2.187	10.0.2.187
95	10.0.2.188/31	10.0.2.188 – 10.0.2.189	10.0.2.189
96	10.0.2.190/31	10.0.2.190 – 10.0.2.191	10.0.2.191
97	10.0.2.192/31	10.0.2.192 – 10.0.2.193	10.0.2.193
98	10.0.2.194/31	10.0.2.194 – 10.0.2.195	10.0.2.195
99	10.0.2.196/31	10.0.2.196 – 10.0.2.197	10.0.2.197
100	10.0.2.198/31	10.0.2.198 – 10.0.2.199	10.0.2.199
101	10.0.2.200/31	10.0.2.200 – 10.0.2.201	10.0.2.201
102	10.0.2.202/31	10.0.2.202 – 10.0.2.203	10.0.2.203
103	10.0.2.204/31	10.0.2.204 – 10.0.2.205	10.0.2.205
104	10.0.2.206/31	10.0.2.206 – 10.0.2.207	10.0.2.207
105	10.0.2.208/31	10.0.2.208 – 10.0.2.209	10.0.2.209
106	10.0.2.210/31	10.0.2.210 – 10.0.2.211	10.0.2.211
107	10.0.2.212/31	10.0.2.212 – 10.0.2.213	10.0.2.213
108	10.0.2.214/31	10.0.2.214 – 10.0.2.215	10.0.2.215
109	10.0.2.216/31	10.0.2.216 – 10.0.2.217	10.0.2.217
110	10.0.2.218/31	10.0.2.218 – 10.0.2.219	10.0.2.219
111	10.0.2.220/31	10.0.2.220 – 10.0.2.221	10.0.2.221
112	10.0.2.222/31	10.0.2.222 – 10.0.2.223	10.0.2.223
113	10.0.2.224/31	10.0.2.224 – 10.0.2.225	10.0.2.225
114	10.0.2.226/31	10.0.2.226 – 10.0.2.227	10.0.2.227
115	10.0.2.228/31	10.0.2.228 – 10.0.2.229	10.0.2.229
116	10.0.2.230/31	10.0.2.230 – 10.0.2.231	10.0.2.231
117	10.0.2.232/31	10.0.2.232 – 10.0.2.233	10.0.2.233
118	10.0.2.234/31	10.0.2.234 – 10.0.2.235	10.0.2.235
119	10.0.2.236/31	10.0.2.236 – 10.0.2.237	10.0.2.237
120	10.0.2.238/31	10.0.2.238 – 10.0.2.239	10.0.2.239
121	10.0.2.240/31	10.0.2.240 – 10.0.2.241	10.0.2.241
122	10.0.2.242/31	10.0.2.242 – 10.0.2.243	10.0.2.243
123	10.0.2.244/31	10.0.2.244 – 10.0.2.245	10.0.2.245
124	10.0.2.246/31	10.0.2.246 – 10.0.2.247	10.0.2.247
125	10.0.2.248/31	10.0.2.248 – 10.0.2.249	10.0.2.249
126	10.0.2.250/31	10.0.2.250 – 10.0.2.251	10.0.2.251
127	10.0.2.252/31	10.0.2.252 – 10.0.2.253	10.0.2.253
128	10.0.2.254/31	10.0.2.254 – 10.0.2.255	10.0.2.255

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 →