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)10.0.213.0/24

network10.0.213.0/24

broadcast10.0.213.255

first host10.0.213.1

last host10.0.213.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.213.0/24

address00001010.00000000.11010101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.11010101.00000000

broadcast00001010.00000000.11010101.11111111

green = network part, grey = host part

hex0x0a00d500

decimal167826688

reverse dns0.213.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:d500

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.213.0/31	10.0.213.0 – 10.0.213.1	10.0.213.1
2	10.0.213.2/31	10.0.213.2 – 10.0.213.3	10.0.213.3
3	10.0.213.4/31	10.0.213.4 – 10.0.213.5	10.0.213.5
4	10.0.213.6/31	10.0.213.6 – 10.0.213.7	10.0.213.7
5	10.0.213.8/31	10.0.213.8 – 10.0.213.9	10.0.213.9
6	10.0.213.10/31	10.0.213.10 – 10.0.213.11	10.0.213.11
7	10.0.213.12/31	10.0.213.12 – 10.0.213.13	10.0.213.13
8	10.0.213.14/31	10.0.213.14 – 10.0.213.15	10.0.213.15
9	10.0.213.16/31	10.0.213.16 – 10.0.213.17	10.0.213.17
10	10.0.213.18/31	10.0.213.18 – 10.0.213.19	10.0.213.19
11	10.0.213.20/31	10.0.213.20 – 10.0.213.21	10.0.213.21
12	10.0.213.22/31	10.0.213.22 – 10.0.213.23	10.0.213.23
13	10.0.213.24/31	10.0.213.24 – 10.0.213.25	10.0.213.25
14	10.0.213.26/31	10.0.213.26 – 10.0.213.27	10.0.213.27
15	10.0.213.28/31	10.0.213.28 – 10.0.213.29	10.0.213.29
16	10.0.213.30/31	10.0.213.30 – 10.0.213.31	10.0.213.31
17	10.0.213.32/31	10.0.213.32 – 10.0.213.33	10.0.213.33
18	10.0.213.34/31	10.0.213.34 – 10.0.213.35	10.0.213.35
19	10.0.213.36/31	10.0.213.36 – 10.0.213.37	10.0.213.37
20	10.0.213.38/31	10.0.213.38 – 10.0.213.39	10.0.213.39
21	10.0.213.40/31	10.0.213.40 – 10.0.213.41	10.0.213.41
22	10.0.213.42/31	10.0.213.42 – 10.0.213.43	10.0.213.43
23	10.0.213.44/31	10.0.213.44 – 10.0.213.45	10.0.213.45
24	10.0.213.46/31	10.0.213.46 – 10.0.213.47	10.0.213.47
25	10.0.213.48/31	10.0.213.48 – 10.0.213.49	10.0.213.49
26	10.0.213.50/31	10.0.213.50 – 10.0.213.51	10.0.213.51
27	10.0.213.52/31	10.0.213.52 – 10.0.213.53	10.0.213.53
28	10.0.213.54/31	10.0.213.54 – 10.0.213.55	10.0.213.55
29	10.0.213.56/31	10.0.213.56 – 10.0.213.57	10.0.213.57
30	10.0.213.58/31	10.0.213.58 – 10.0.213.59	10.0.213.59
31	10.0.213.60/31	10.0.213.60 – 10.0.213.61	10.0.213.61
32	10.0.213.62/31	10.0.213.62 – 10.0.213.63	10.0.213.63
33	10.0.213.64/31	10.0.213.64 – 10.0.213.65	10.0.213.65
34	10.0.213.66/31	10.0.213.66 – 10.0.213.67	10.0.213.67
35	10.0.213.68/31	10.0.213.68 – 10.0.213.69	10.0.213.69
36	10.0.213.70/31	10.0.213.70 – 10.0.213.71	10.0.213.71
37	10.0.213.72/31	10.0.213.72 – 10.0.213.73	10.0.213.73
38	10.0.213.74/31	10.0.213.74 – 10.0.213.75	10.0.213.75
39	10.0.213.76/31	10.0.213.76 – 10.0.213.77	10.0.213.77
40	10.0.213.78/31	10.0.213.78 – 10.0.213.79	10.0.213.79
41	10.0.213.80/31	10.0.213.80 – 10.0.213.81	10.0.213.81
42	10.0.213.82/31	10.0.213.82 – 10.0.213.83	10.0.213.83
43	10.0.213.84/31	10.0.213.84 – 10.0.213.85	10.0.213.85
44	10.0.213.86/31	10.0.213.86 – 10.0.213.87	10.0.213.87
45	10.0.213.88/31	10.0.213.88 – 10.0.213.89	10.0.213.89
46	10.0.213.90/31	10.0.213.90 – 10.0.213.91	10.0.213.91
47	10.0.213.92/31	10.0.213.92 – 10.0.213.93	10.0.213.93
48	10.0.213.94/31	10.0.213.94 – 10.0.213.95	10.0.213.95
49	10.0.213.96/31	10.0.213.96 – 10.0.213.97	10.0.213.97
50	10.0.213.98/31	10.0.213.98 – 10.0.213.99	10.0.213.99
51	10.0.213.100/31	10.0.213.100 – 10.0.213.101	10.0.213.101
52	10.0.213.102/31	10.0.213.102 – 10.0.213.103	10.0.213.103
53	10.0.213.104/31	10.0.213.104 – 10.0.213.105	10.0.213.105
54	10.0.213.106/31	10.0.213.106 – 10.0.213.107	10.0.213.107
55	10.0.213.108/31	10.0.213.108 – 10.0.213.109	10.0.213.109
56	10.0.213.110/31	10.0.213.110 – 10.0.213.111	10.0.213.111
57	10.0.213.112/31	10.0.213.112 – 10.0.213.113	10.0.213.113
58	10.0.213.114/31	10.0.213.114 – 10.0.213.115	10.0.213.115
59	10.0.213.116/31	10.0.213.116 – 10.0.213.117	10.0.213.117
60	10.0.213.118/31	10.0.213.118 – 10.0.213.119	10.0.213.119
61	10.0.213.120/31	10.0.213.120 – 10.0.213.121	10.0.213.121
62	10.0.213.122/31	10.0.213.122 – 10.0.213.123	10.0.213.123
63	10.0.213.124/31	10.0.213.124 – 10.0.213.125	10.0.213.125
64	10.0.213.126/31	10.0.213.126 – 10.0.213.127	10.0.213.127
65	10.0.213.128/31	10.0.213.128 – 10.0.213.129	10.0.213.129
66	10.0.213.130/31	10.0.213.130 – 10.0.213.131	10.0.213.131
67	10.0.213.132/31	10.0.213.132 – 10.0.213.133	10.0.213.133
68	10.0.213.134/31	10.0.213.134 – 10.0.213.135	10.0.213.135
69	10.0.213.136/31	10.0.213.136 – 10.0.213.137	10.0.213.137
70	10.0.213.138/31	10.0.213.138 – 10.0.213.139	10.0.213.139
71	10.0.213.140/31	10.0.213.140 – 10.0.213.141	10.0.213.141
72	10.0.213.142/31	10.0.213.142 – 10.0.213.143	10.0.213.143
73	10.0.213.144/31	10.0.213.144 – 10.0.213.145	10.0.213.145
74	10.0.213.146/31	10.0.213.146 – 10.0.213.147	10.0.213.147
75	10.0.213.148/31	10.0.213.148 – 10.0.213.149	10.0.213.149
76	10.0.213.150/31	10.0.213.150 – 10.0.213.151	10.0.213.151
77	10.0.213.152/31	10.0.213.152 – 10.0.213.153	10.0.213.153
78	10.0.213.154/31	10.0.213.154 – 10.0.213.155	10.0.213.155
79	10.0.213.156/31	10.0.213.156 – 10.0.213.157	10.0.213.157
80	10.0.213.158/31	10.0.213.158 – 10.0.213.159	10.0.213.159
81	10.0.213.160/31	10.0.213.160 – 10.0.213.161	10.0.213.161
82	10.0.213.162/31	10.0.213.162 – 10.0.213.163	10.0.213.163
83	10.0.213.164/31	10.0.213.164 – 10.0.213.165	10.0.213.165
84	10.0.213.166/31	10.0.213.166 – 10.0.213.167	10.0.213.167
85	10.0.213.168/31	10.0.213.168 – 10.0.213.169	10.0.213.169
86	10.0.213.170/31	10.0.213.170 – 10.0.213.171	10.0.213.171
87	10.0.213.172/31	10.0.213.172 – 10.0.213.173	10.0.213.173
88	10.0.213.174/31	10.0.213.174 – 10.0.213.175	10.0.213.175
89	10.0.213.176/31	10.0.213.176 – 10.0.213.177	10.0.213.177
90	10.0.213.178/31	10.0.213.178 – 10.0.213.179	10.0.213.179
91	10.0.213.180/31	10.0.213.180 – 10.0.213.181	10.0.213.181
92	10.0.213.182/31	10.0.213.182 – 10.0.213.183	10.0.213.183
93	10.0.213.184/31	10.0.213.184 – 10.0.213.185	10.0.213.185
94	10.0.213.186/31	10.0.213.186 – 10.0.213.187	10.0.213.187
95	10.0.213.188/31	10.0.213.188 – 10.0.213.189	10.0.213.189
96	10.0.213.190/31	10.0.213.190 – 10.0.213.191	10.0.213.191
97	10.0.213.192/31	10.0.213.192 – 10.0.213.193	10.0.213.193
98	10.0.213.194/31	10.0.213.194 – 10.0.213.195	10.0.213.195
99	10.0.213.196/31	10.0.213.196 – 10.0.213.197	10.0.213.197
100	10.0.213.198/31	10.0.213.198 – 10.0.213.199	10.0.213.199
101	10.0.213.200/31	10.0.213.200 – 10.0.213.201	10.0.213.201
102	10.0.213.202/31	10.0.213.202 – 10.0.213.203	10.0.213.203
103	10.0.213.204/31	10.0.213.204 – 10.0.213.205	10.0.213.205
104	10.0.213.206/31	10.0.213.206 – 10.0.213.207	10.0.213.207
105	10.0.213.208/31	10.0.213.208 – 10.0.213.209	10.0.213.209
106	10.0.213.210/31	10.0.213.210 – 10.0.213.211	10.0.213.211
107	10.0.213.212/31	10.0.213.212 – 10.0.213.213	10.0.213.213
108	10.0.213.214/31	10.0.213.214 – 10.0.213.215	10.0.213.215
109	10.0.213.216/31	10.0.213.216 – 10.0.213.217	10.0.213.217
110	10.0.213.218/31	10.0.213.218 – 10.0.213.219	10.0.213.219
111	10.0.213.220/31	10.0.213.220 – 10.0.213.221	10.0.213.221
112	10.0.213.222/31	10.0.213.222 – 10.0.213.223	10.0.213.223
113	10.0.213.224/31	10.0.213.224 – 10.0.213.225	10.0.213.225
114	10.0.213.226/31	10.0.213.226 – 10.0.213.227	10.0.213.227
115	10.0.213.228/31	10.0.213.228 – 10.0.213.229	10.0.213.229
116	10.0.213.230/31	10.0.213.230 – 10.0.213.231	10.0.213.231
117	10.0.213.232/31	10.0.213.232 – 10.0.213.233	10.0.213.233
118	10.0.213.234/31	10.0.213.234 – 10.0.213.235	10.0.213.235
119	10.0.213.236/31	10.0.213.236 – 10.0.213.237	10.0.213.237
120	10.0.213.238/31	10.0.213.238 – 10.0.213.239	10.0.213.239
121	10.0.213.240/31	10.0.213.240 – 10.0.213.241	10.0.213.241
122	10.0.213.242/31	10.0.213.242 – 10.0.213.243	10.0.213.243
123	10.0.213.244/31	10.0.213.244 – 10.0.213.245	10.0.213.245
124	10.0.213.246/31	10.0.213.246 – 10.0.213.247	10.0.213.247
125	10.0.213.248/31	10.0.213.248 – 10.0.213.249	10.0.213.249
126	10.0.213.250/31	10.0.213.250 – 10.0.213.251	10.0.213.251
127	10.0.213.252/31	10.0.213.252 – 10.0.213.253	10.0.213.253
128	10.0.213.254/31	10.0.213.254 – 10.0.213.255	10.0.213.255

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 →