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)10.2.216.0/24

network10.2.216.0/24

broadcast10.2.216.255

first host10.2.216.1

last host10.2.216.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.216.0/24

address00001010.00000010.11011000.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.11011000.00000000

broadcast00001010.00000010.11011000.11111111

green = network part, grey = host part

hex0x0a02d800

decimal167958528

reverse dns0.216.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:d800

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.216.0/31	10.2.216.0 – 10.2.216.1	10.2.216.1
2	10.2.216.2/31	10.2.216.2 – 10.2.216.3	10.2.216.3
3	10.2.216.4/31	10.2.216.4 – 10.2.216.5	10.2.216.5
4	10.2.216.6/31	10.2.216.6 – 10.2.216.7	10.2.216.7
5	10.2.216.8/31	10.2.216.8 – 10.2.216.9	10.2.216.9
6	10.2.216.10/31	10.2.216.10 – 10.2.216.11	10.2.216.11
7	10.2.216.12/31	10.2.216.12 – 10.2.216.13	10.2.216.13
8	10.2.216.14/31	10.2.216.14 – 10.2.216.15	10.2.216.15
9	10.2.216.16/31	10.2.216.16 – 10.2.216.17	10.2.216.17
10	10.2.216.18/31	10.2.216.18 – 10.2.216.19	10.2.216.19
11	10.2.216.20/31	10.2.216.20 – 10.2.216.21	10.2.216.21
12	10.2.216.22/31	10.2.216.22 – 10.2.216.23	10.2.216.23
13	10.2.216.24/31	10.2.216.24 – 10.2.216.25	10.2.216.25
14	10.2.216.26/31	10.2.216.26 – 10.2.216.27	10.2.216.27
15	10.2.216.28/31	10.2.216.28 – 10.2.216.29	10.2.216.29
16	10.2.216.30/31	10.2.216.30 – 10.2.216.31	10.2.216.31
17	10.2.216.32/31	10.2.216.32 – 10.2.216.33	10.2.216.33
18	10.2.216.34/31	10.2.216.34 – 10.2.216.35	10.2.216.35
19	10.2.216.36/31	10.2.216.36 – 10.2.216.37	10.2.216.37
20	10.2.216.38/31	10.2.216.38 – 10.2.216.39	10.2.216.39
21	10.2.216.40/31	10.2.216.40 – 10.2.216.41	10.2.216.41
22	10.2.216.42/31	10.2.216.42 – 10.2.216.43	10.2.216.43
23	10.2.216.44/31	10.2.216.44 – 10.2.216.45	10.2.216.45
24	10.2.216.46/31	10.2.216.46 – 10.2.216.47	10.2.216.47
25	10.2.216.48/31	10.2.216.48 – 10.2.216.49	10.2.216.49
26	10.2.216.50/31	10.2.216.50 – 10.2.216.51	10.2.216.51
27	10.2.216.52/31	10.2.216.52 – 10.2.216.53	10.2.216.53
28	10.2.216.54/31	10.2.216.54 – 10.2.216.55	10.2.216.55
29	10.2.216.56/31	10.2.216.56 – 10.2.216.57	10.2.216.57
30	10.2.216.58/31	10.2.216.58 – 10.2.216.59	10.2.216.59
31	10.2.216.60/31	10.2.216.60 – 10.2.216.61	10.2.216.61
32	10.2.216.62/31	10.2.216.62 – 10.2.216.63	10.2.216.63
33	10.2.216.64/31	10.2.216.64 – 10.2.216.65	10.2.216.65
34	10.2.216.66/31	10.2.216.66 – 10.2.216.67	10.2.216.67
35	10.2.216.68/31	10.2.216.68 – 10.2.216.69	10.2.216.69
36	10.2.216.70/31	10.2.216.70 – 10.2.216.71	10.2.216.71
37	10.2.216.72/31	10.2.216.72 – 10.2.216.73	10.2.216.73
38	10.2.216.74/31	10.2.216.74 – 10.2.216.75	10.2.216.75
39	10.2.216.76/31	10.2.216.76 – 10.2.216.77	10.2.216.77
40	10.2.216.78/31	10.2.216.78 – 10.2.216.79	10.2.216.79
41	10.2.216.80/31	10.2.216.80 – 10.2.216.81	10.2.216.81
42	10.2.216.82/31	10.2.216.82 – 10.2.216.83	10.2.216.83
43	10.2.216.84/31	10.2.216.84 – 10.2.216.85	10.2.216.85
44	10.2.216.86/31	10.2.216.86 – 10.2.216.87	10.2.216.87
45	10.2.216.88/31	10.2.216.88 – 10.2.216.89	10.2.216.89
46	10.2.216.90/31	10.2.216.90 – 10.2.216.91	10.2.216.91
47	10.2.216.92/31	10.2.216.92 – 10.2.216.93	10.2.216.93
48	10.2.216.94/31	10.2.216.94 – 10.2.216.95	10.2.216.95
49	10.2.216.96/31	10.2.216.96 – 10.2.216.97	10.2.216.97
50	10.2.216.98/31	10.2.216.98 – 10.2.216.99	10.2.216.99
51	10.2.216.100/31	10.2.216.100 – 10.2.216.101	10.2.216.101
52	10.2.216.102/31	10.2.216.102 – 10.2.216.103	10.2.216.103
53	10.2.216.104/31	10.2.216.104 – 10.2.216.105	10.2.216.105
54	10.2.216.106/31	10.2.216.106 – 10.2.216.107	10.2.216.107
55	10.2.216.108/31	10.2.216.108 – 10.2.216.109	10.2.216.109
56	10.2.216.110/31	10.2.216.110 – 10.2.216.111	10.2.216.111
57	10.2.216.112/31	10.2.216.112 – 10.2.216.113	10.2.216.113
58	10.2.216.114/31	10.2.216.114 – 10.2.216.115	10.2.216.115
59	10.2.216.116/31	10.2.216.116 – 10.2.216.117	10.2.216.117
60	10.2.216.118/31	10.2.216.118 – 10.2.216.119	10.2.216.119
61	10.2.216.120/31	10.2.216.120 – 10.2.216.121	10.2.216.121
62	10.2.216.122/31	10.2.216.122 – 10.2.216.123	10.2.216.123
63	10.2.216.124/31	10.2.216.124 – 10.2.216.125	10.2.216.125
64	10.2.216.126/31	10.2.216.126 – 10.2.216.127	10.2.216.127
65	10.2.216.128/31	10.2.216.128 – 10.2.216.129	10.2.216.129
66	10.2.216.130/31	10.2.216.130 – 10.2.216.131	10.2.216.131
67	10.2.216.132/31	10.2.216.132 – 10.2.216.133	10.2.216.133
68	10.2.216.134/31	10.2.216.134 – 10.2.216.135	10.2.216.135
69	10.2.216.136/31	10.2.216.136 – 10.2.216.137	10.2.216.137
70	10.2.216.138/31	10.2.216.138 – 10.2.216.139	10.2.216.139
71	10.2.216.140/31	10.2.216.140 – 10.2.216.141	10.2.216.141
72	10.2.216.142/31	10.2.216.142 – 10.2.216.143	10.2.216.143
73	10.2.216.144/31	10.2.216.144 – 10.2.216.145	10.2.216.145
74	10.2.216.146/31	10.2.216.146 – 10.2.216.147	10.2.216.147
75	10.2.216.148/31	10.2.216.148 – 10.2.216.149	10.2.216.149
76	10.2.216.150/31	10.2.216.150 – 10.2.216.151	10.2.216.151
77	10.2.216.152/31	10.2.216.152 – 10.2.216.153	10.2.216.153
78	10.2.216.154/31	10.2.216.154 – 10.2.216.155	10.2.216.155
79	10.2.216.156/31	10.2.216.156 – 10.2.216.157	10.2.216.157
80	10.2.216.158/31	10.2.216.158 – 10.2.216.159	10.2.216.159
81	10.2.216.160/31	10.2.216.160 – 10.2.216.161	10.2.216.161
82	10.2.216.162/31	10.2.216.162 – 10.2.216.163	10.2.216.163
83	10.2.216.164/31	10.2.216.164 – 10.2.216.165	10.2.216.165
84	10.2.216.166/31	10.2.216.166 – 10.2.216.167	10.2.216.167
85	10.2.216.168/31	10.2.216.168 – 10.2.216.169	10.2.216.169
86	10.2.216.170/31	10.2.216.170 – 10.2.216.171	10.2.216.171
87	10.2.216.172/31	10.2.216.172 – 10.2.216.173	10.2.216.173
88	10.2.216.174/31	10.2.216.174 – 10.2.216.175	10.2.216.175
89	10.2.216.176/31	10.2.216.176 – 10.2.216.177	10.2.216.177
90	10.2.216.178/31	10.2.216.178 – 10.2.216.179	10.2.216.179
91	10.2.216.180/31	10.2.216.180 – 10.2.216.181	10.2.216.181
92	10.2.216.182/31	10.2.216.182 – 10.2.216.183	10.2.216.183
93	10.2.216.184/31	10.2.216.184 – 10.2.216.185	10.2.216.185
94	10.2.216.186/31	10.2.216.186 – 10.2.216.187	10.2.216.187
95	10.2.216.188/31	10.2.216.188 – 10.2.216.189	10.2.216.189
96	10.2.216.190/31	10.2.216.190 – 10.2.216.191	10.2.216.191
97	10.2.216.192/31	10.2.216.192 – 10.2.216.193	10.2.216.193
98	10.2.216.194/31	10.2.216.194 – 10.2.216.195	10.2.216.195
99	10.2.216.196/31	10.2.216.196 – 10.2.216.197	10.2.216.197
100	10.2.216.198/31	10.2.216.198 – 10.2.216.199	10.2.216.199
101	10.2.216.200/31	10.2.216.200 – 10.2.216.201	10.2.216.201
102	10.2.216.202/31	10.2.216.202 – 10.2.216.203	10.2.216.203
103	10.2.216.204/31	10.2.216.204 – 10.2.216.205	10.2.216.205
104	10.2.216.206/31	10.2.216.206 – 10.2.216.207	10.2.216.207
105	10.2.216.208/31	10.2.216.208 – 10.2.216.209	10.2.216.209
106	10.2.216.210/31	10.2.216.210 – 10.2.216.211	10.2.216.211
107	10.2.216.212/31	10.2.216.212 – 10.2.216.213	10.2.216.213
108	10.2.216.214/31	10.2.216.214 – 10.2.216.215	10.2.216.215
109	10.2.216.216/31	10.2.216.216 – 10.2.216.217	10.2.216.217
110	10.2.216.218/31	10.2.216.218 – 10.2.216.219	10.2.216.219
111	10.2.216.220/31	10.2.216.220 – 10.2.216.221	10.2.216.221
112	10.2.216.222/31	10.2.216.222 – 10.2.216.223	10.2.216.223
113	10.2.216.224/31	10.2.216.224 – 10.2.216.225	10.2.216.225
114	10.2.216.226/31	10.2.216.226 – 10.2.216.227	10.2.216.227
115	10.2.216.228/31	10.2.216.228 – 10.2.216.229	10.2.216.229
116	10.2.216.230/31	10.2.216.230 – 10.2.216.231	10.2.216.231
117	10.2.216.232/31	10.2.216.232 – 10.2.216.233	10.2.216.233
118	10.2.216.234/31	10.2.216.234 – 10.2.216.235	10.2.216.235
119	10.2.216.236/31	10.2.216.236 – 10.2.216.237	10.2.216.237
120	10.2.216.238/31	10.2.216.238 – 10.2.216.239	10.2.216.239
121	10.2.216.240/31	10.2.216.240 – 10.2.216.241	10.2.216.241
122	10.2.216.242/31	10.2.216.242 – 10.2.216.243	10.2.216.243
123	10.2.216.244/31	10.2.216.244 – 10.2.216.245	10.2.216.245
124	10.2.216.246/31	10.2.216.246 – 10.2.216.247	10.2.216.247
125	10.2.216.248/31	10.2.216.248 – 10.2.216.249	10.2.216.249
126	10.2.216.250/31	10.2.216.250 – 10.2.216.251	10.2.216.251
127	10.2.216.252/31	10.2.216.252 – 10.2.216.253	10.2.216.253
128	10.2.216.254/31	10.2.216.254 – 10.2.216.255	10.2.216.255

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 →