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)10.2.217.0/24

network10.2.217.0/24

broadcast10.2.217.255

first host10.2.217.1

last host10.2.217.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.217.0/24

address00001010.00000010.11011001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.11011001.00000000

broadcast00001010.00000010.11011001.11111111

green = network part, grey = host part

hex0x0a02d900

decimal167958784

reverse dns0.217.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:d900

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.217.0/31	10.2.217.0 – 10.2.217.1	10.2.217.1
2	10.2.217.2/31	10.2.217.2 – 10.2.217.3	10.2.217.3
3	10.2.217.4/31	10.2.217.4 – 10.2.217.5	10.2.217.5
4	10.2.217.6/31	10.2.217.6 – 10.2.217.7	10.2.217.7
5	10.2.217.8/31	10.2.217.8 – 10.2.217.9	10.2.217.9
6	10.2.217.10/31	10.2.217.10 – 10.2.217.11	10.2.217.11
7	10.2.217.12/31	10.2.217.12 – 10.2.217.13	10.2.217.13
8	10.2.217.14/31	10.2.217.14 – 10.2.217.15	10.2.217.15
9	10.2.217.16/31	10.2.217.16 – 10.2.217.17	10.2.217.17
10	10.2.217.18/31	10.2.217.18 – 10.2.217.19	10.2.217.19
11	10.2.217.20/31	10.2.217.20 – 10.2.217.21	10.2.217.21
12	10.2.217.22/31	10.2.217.22 – 10.2.217.23	10.2.217.23
13	10.2.217.24/31	10.2.217.24 – 10.2.217.25	10.2.217.25
14	10.2.217.26/31	10.2.217.26 – 10.2.217.27	10.2.217.27
15	10.2.217.28/31	10.2.217.28 – 10.2.217.29	10.2.217.29
16	10.2.217.30/31	10.2.217.30 – 10.2.217.31	10.2.217.31
17	10.2.217.32/31	10.2.217.32 – 10.2.217.33	10.2.217.33
18	10.2.217.34/31	10.2.217.34 – 10.2.217.35	10.2.217.35
19	10.2.217.36/31	10.2.217.36 – 10.2.217.37	10.2.217.37
20	10.2.217.38/31	10.2.217.38 – 10.2.217.39	10.2.217.39
21	10.2.217.40/31	10.2.217.40 – 10.2.217.41	10.2.217.41
22	10.2.217.42/31	10.2.217.42 – 10.2.217.43	10.2.217.43
23	10.2.217.44/31	10.2.217.44 – 10.2.217.45	10.2.217.45
24	10.2.217.46/31	10.2.217.46 – 10.2.217.47	10.2.217.47
25	10.2.217.48/31	10.2.217.48 – 10.2.217.49	10.2.217.49
26	10.2.217.50/31	10.2.217.50 – 10.2.217.51	10.2.217.51
27	10.2.217.52/31	10.2.217.52 – 10.2.217.53	10.2.217.53
28	10.2.217.54/31	10.2.217.54 – 10.2.217.55	10.2.217.55
29	10.2.217.56/31	10.2.217.56 – 10.2.217.57	10.2.217.57
30	10.2.217.58/31	10.2.217.58 – 10.2.217.59	10.2.217.59
31	10.2.217.60/31	10.2.217.60 – 10.2.217.61	10.2.217.61
32	10.2.217.62/31	10.2.217.62 – 10.2.217.63	10.2.217.63
33	10.2.217.64/31	10.2.217.64 – 10.2.217.65	10.2.217.65
34	10.2.217.66/31	10.2.217.66 – 10.2.217.67	10.2.217.67
35	10.2.217.68/31	10.2.217.68 – 10.2.217.69	10.2.217.69
36	10.2.217.70/31	10.2.217.70 – 10.2.217.71	10.2.217.71
37	10.2.217.72/31	10.2.217.72 – 10.2.217.73	10.2.217.73
38	10.2.217.74/31	10.2.217.74 – 10.2.217.75	10.2.217.75
39	10.2.217.76/31	10.2.217.76 – 10.2.217.77	10.2.217.77
40	10.2.217.78/31	10.2.217.78 – 10.2.217.79	10.2.217.79
41	10.2.217.80/31	10.2.217.80 – 10.2.217.81	10.2.217.81
42	10.2.217.82/31	10.2.217.82 – 10.2.217.83	10.2.217.83
43	10.2.217.84/31	10.2.217.84 – 10.2.217.85	10.2.217.85
44	10.2.217.86/31	10.2.217.86 – 10.2.217.87	10.2.217.87
45	10.2.217.88/31	10.2.217.88 – 10.2.217.89	10.2.217.89
46	10.2.217.90/31	10.2.217.90 – 10.2.217.91	10.2.217.91
47	10.2.217.92/31	10.2.217.92 – 10.2.217.93	10.2.217.93
48	10.2.217.94/31	10.2.217.94 – 10.2.217.95	10.2.217.95
49	10.2.217.96/31	10.2.217.96 – 10.2.217.97	10.2.217.97
50	10.2.217.98/31	10.2.217.98 – 10.2.217.99	10.2.217.99
51	10.2.217.100/31	10.2.217.100 – 10.2.217.101	10.2.217.101
52	10.2.217.102/31	10.2.217.102 – 10.2.217.103	10.2.217.103
53	10.2.217.104/31	10.2.217.104 – 10.2.217.105	10.2.217.105
54	10.2.217.106/31	10.2.217.106 – 10.2.217.107	10.2.217.107
55	10.2.217.108/31	10.2.217.108 – 10.2.217.109	10.2.217.109
56	10.2.217.110/31	10.2.217.110 – 10.2.217.111	10.2.217.111
57	10.2.217.112/31	10.2.217.112 – 10.2.217.113	10.2.217.113
58	10.2.217.114/31	10.2.217.114 – 10.2.217.115	10.2.217.115
59	10.2.217.116/31	10.2.217.116 – 10.2.217.117	10.2.217.117
60	10.2.217.118/31	10.2.217.118 – 10.2.217.119	10.2.217.119
61	10.2.217.120/31	10.2.217.120 – 10.2.217.121	10.2.217.121
62	10.2.217.122/31	10.2.217.122 – 10.2.217.123	10.2.217.123
63	10.2.217.124/31	10.2.217.124 – 10.2.217.125	10.2.217.125
64	10.2.217.126/31	10.2.217.126 – 10.2.217.127	10.2.217.127
65	10.2.217.128/31	10.2.217.128 – 10.2.217.129	10.2.217.129
66	10.2.217.130/31	10.2.217.130 – 10.2.217.131	10.2.217.131
67	10.2.217.132/31	10.2.217.132 – 10.2.217.133	10.2.217.133
68	10.2.217.134/31	10.2.217.134 – 10.2.217.135	10.2.217.135
69	10.2.217.136/31	10.2.217.136 – 10.2.217.137	10.2.217.137
70	10.2.217.138/31	10.2.217.138 – 10.2.217.139	10.2.217.139
71	10.2.217.140/31	10.2.217.140 – 10.2.217.141	10.2.217.141
72	10.2.217.142/31	10.2.217.142 – 10.2.217.143	10.2.217.143
73	10.2.217.144/31	10.2.217.144 – 10.2.217.145	10.2.217.145
74	10.2.217.146/31	10.2.217.146 – 10.2.217.147	10.2.217.147
75	10.2.217.148/31	10.2.217.148 – 10.2.217.149	10.2.217.149
76	10.2.217.150/31	10.2.217.150 – 10.2.217.151	10.2.217.151
77	10.2.217.152/31	10.2.217.152 – 10.2.217.153	10.2.217.153
78	10.2.217.154/31	10.2.217.154 – 10.2.217.155	10.2.217.155
79	10.2.217.156/31	10.2.217.156 – 10.2.217.157	10.2.217.157
80	10.2.217.158/31	10.2.217.158 – 10.2.217.159	10.2.217.159
81	10.2.217.160/31	10.2.217.160 – 10.2.217.161	10.2.217.161
82	10.2.217.162/31	10.2.217.162 – 10.2.217.163	10.2.217.163
83	10.2.217.164/31	10.2.217.164 – 10.2.217.165	10.2.217.165
84	10.2.217.166/31	10.2.217.166 – 10.2.217.167	10.2.217.167
85	10.2.217.168/31	10.2.217.168 – 10.2.217.169	10.2.217.169
86	10.2.217.170/31	10.2.217.170 – 10.2.217.171	10.2.217.171
87	10.2.217.172/31	10.2.217.172 – 10.2.217.173	10.2.217.173
88	10.2.217.174/31	10.2.217.174 – 10.2.217.175	10.2.217.175
89	10.2.217.176/31	10.2.217.176 – 10.2.217.177	10.2.217.177
90	10.2.217.178/31	10.2.217.178 – 10.2.217.179	10.2.217.179
91	10.2.217.180/31	10.2.217.180 – 10.2.217.181	10.2.217.181
92	10.2.217.182/31	10.2.217.182 – 10.2.217.183	10.2.217.183
93	10.2.217.184/31	10.2.217.184 – 10.2.217.185	10.2.217.185
94	10.2.217.186/31	10.2.217.186 – 10.2.217.187	10.2.217.187
95	10.2.217.188/31	10.2.217.188 – 10.2.217.189	10.2.217.189
96	10.2.217.190/31	10.2.217.190 – 10.2.217.191	10.2.217.191
97	10.2.217.192/31	10.2.217.192 – 10.2.217.193	10.2.217.193
98	10.2.217.194/31	10.2.217.194 – 10.2.217.195	10.2.217.195
99	10.2.217.196/31	10.2.217.196 – 10.2.217.197	10.2.217.197
100	10.2.217.198/31	10.2.217.198 – 10.2.217.199	10.2.217.199
101	10.2.217.200/31	10.2.217.200 – 10.2.217.201	10.2.217.201
102	10.2.217.202/31	10.2.217.202 – 10.2.217.203	10.2.217.203
103	10.2.217.204/31	10.2.217.204 – 10.2.217.205	10.2.217.205
104	10.2.217.206/31	10.2.217.206 – 10.2.217.207	10.2.217.207
105	10.2.217.208/31	10.2.217.208 – 10.2.217.209	10.2.217.209
106	10.2.217.210/31	10.2.217.210 – 10.2.217.211	10.2.217.211
107	10.2.217.212/31	10.2.217.212 – 10.2.217.213	10.2.217.213
108	10.2.217.214/31	10.2.217.214 – 10.2.217.215	10.2.217.215
109	10.2.217.216/31	10.2.217.216 – 10.2.217.217	10.2.217.217
110	10.2.217.218/31	10.2.217.218 – 10.2.217.219	10.2.217.219
111	10.2.217.220/31	10.2.217.220 – 10.2.217.221	10.2.217.221
112	10.2.217.222/31	10.2.217.222 – 10.2.217.223	10.2.217.223
113	10.2.217.224/31	10.2.217.224 – 10.2.217.225	10.2.217.225
114	10.2.217.226/31	10.2.217.226 – 10.2.217.227	10.2.217.227
115	10.2.217.228/31	10.2.217.228 – 10.2.217.229	10.2.217.229
116	10.2.217.230/31	10.2.217.230 – 10.2.217.231	10.2.217.231
117	10.2.217.232/31	10.2.217.232 – 10.2.217.233	10.2.217.233
118	10.2.217.234/31	10.2.217.234 – 10.2.217.235	10.2.217.235
119	10.2.217.236/31	10.2.217.236 – 10.2.217.237	10.2.217.237
120	10.2.217.238/31	10.2.217.238 – 10.2.217.239	10.2.217.239
121	10.2.217.240/31	10.2.217.240 – 10.2.217.241	10.2.217.241
122	10.2.217.242/31	10.2.217.242 – 10.2.217.243	10.2.217.243
123	10.2.217.244/31	10.2.217.244 – 10.2.217.245	10.2.217.245
124	10.2.217.246/31	10.2.217.246 – 10.2.217.247	10.2.217.247
125	10.2.217.248/31	10.2.217.248 – 10.2.217.249	10.2.217.249
126	10.2.217.250/31	10.2.217.250 – 10.2.217.251	10.2.217.251
127	10.2.217.252/31	10.2.217.252 – 10.2.217.253	10.2.217.253
128	10.2.217.254/31	10.2.217.254 – 10.2.217.255	10.2.217.255

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 →