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)10.3.211.0/24

network10.3.211.0/24

broadcast10.3.211.255

first host10.3.211.1

last host10.3.211.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.211.0/24

address00001010.00000011.11010011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.11010011.00000000

broadcast00001010.00000011.11010011.11111111

green = network part, grey = host part

hex0x0a03d300

decimal168022784

reverse dns0.211.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:d300

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.211.0/31	10.3.211.0 – 10.3.211.1	10.3.211.1
2	10.3.211.2/31	10.3.211.2 – 10.3.211.3	10.3.211.3
3	10.3.211.4/31	10.3.211.4 – 10.3.211.5	10.3.211.5
4	10.3.211.6/31	10.3.211.6 – 10.3.211.7	10.3.211.7
5	10.3.211.8/31	10.3.211.8 – 10.3.211.9	10.3.211.9
6	10.3.211.10/31	10.3.211.10 – 10.3.211.11	10.3.211.11
7	10.3.211.12/31	10.3.211.12 – 10.3.211.13	10.3.211.13
8	10.3.211.14/31	10.3.211.14 – 10.3.211.15	10.3.211.15
9	10.3.211.16/31	10.3.211.16 – 10.3.211.17	10.3.211.17
10	10.3.211.18/31	10.3.211.18 – 10.3.211.19	10.3.211.19
11	10.3.211.20/31	10.3.211.20 – 10.3.211.21	10.3.211.21
12	10.3.211.22/31	10.3.211.22 – 10.3.211.23	10.3.211.23
13	10.3.211.24/31	10.3.211.24 – 10.3.211.25	10.3.211.25
14	10.3.211.26/31	10.3.211.26 – 10.3.211.27	10.3.211.27
15	10.3.211.28/31	10.3.211.28 – 10.3.211.29	10.3.211.29
16	10.3.211.30/31	10.3.211.30 – 10.3.211.31	10.3.211.31
17	10.3.211.32/31	10.3.211.32 – 10.3.211.33	10.3.211.33
18	10.3.211.34/31	10.3.211.34 – 10.3.211.35	10.3.211.35
19	10.3.211.36/31	10.3.211.36 – 10.3.211.37	10.3.211.37
20	10.3.211.38/31	10.3.211.38 – 10.3.211.39	10.3.211.39
21	10.3.211.40/31	10.3.211.40 – 10.3.211.41	10.3.211.41
22	10.3.211.42/31	10.3.211.42 – 10.3.211.43	10.3.211.43
23	10.3.211.44/31	10.3.211.44 – 10.3.211.45	10.3.211.45
24	10.3.211.46/31	10.3.211.46 – 10.3.211.47	10.3.211.47
25	10.3.211.48/31	10.3.211.48 – 10.3.211.49	10.3.211.49
26	10.3.211.50/31	10.3.211.50 – 10.3.211.51	10.3.211.51
27	10.3.211.52/31	10.3.211.52 – 10.3.211.53	10.3.211.53
28	10.3.211.54/31	10.3.211.54 – 10.3.211.55	10.3.211.55
29	10.3.211.56/31	10.3.211.56 – 10.3.211.57	10.3.211.57
30	10.3.211.58/31	10.3.211.58 – 10.3.211.59	10.3.211.59
31	10.3.211.60/31	10.3.211.60 – 10.3.211.61	10.3.211.61
32	10.3.211.62/31	10.3.211.62 – 10.3.211.63	10.3.211.63
33	10.3.211.64/31	10.3.211.64 – 10.3.211.65	10.3.211.65
34	10.3.211.66/31	10.3.211.66 – 10.3.211.67	10.3.211.67
35	10.3.211.68/31	10.3.211.68 – 10.3.211.69	10.3.211.69
36	10.3.211.70/31	10.3.211.70 – 10.3.211.71	10.3.211.71
37	10.3.211.72/31	10.3.211.72 – 10.3.211.73	10.3.211.73
38	10.3.211.74/31	10.3.211.74 – 10.3.211.75	10.3.211.75
39	10.3.211.76/31	10.3.211.76 – 10.3.211.77	10.3.211.77
40	10.3.211.78/31	10.3.211.78 – 10.3.211.79	10.3.211.79
41	10.3.211.80/31	10.3.211.80 – 10.3.211.81	10.3.211.81
42	10.3.211.82/31	10.3.211.82 – 10.3.211.83	10.3.211.83
43	10.3.211.84/31	10.3.211.84 – 10.3.211.85	10.3.211.85
44	10.3.211.86/31	10.3.211.86 – 10.3.211.87	10.3.211.87
45	10.3.211.88/31	10.3.211.88 – 10.3.211.89	10.3.211.89
46	10.3.211.90/31	10.3.211.90 – 10.3.211.91	10.3.211.91
47	10.3.211.92/31	10.3.211.92 – 10.3.211.93	10.3.211.93
48	10.3.211.94/31	10.3.211.94 – 10.3.211.95	10.3.211.95
49	10.3.211.96/31	10.3.211.96 – 10.3.211.97	10.3.211.97
50	10.3.211.98/31	10.3.211.98 – 10.3.211.99	10.3.211.99
51	10.3.211.100/31	10.3.211.100 – 10.3.211.101	10.3.211.101
52	10.3.211.102/31	10.3.211.102 – 10.3.211.103	10.3.211.103
53	10.3.211.104/31	10.3.211.104 – 10.3.211.105	10.3.211.105
54	10.3.211.106/31	10.3.211.106 – 10.3.211.107	10.3.211.107
55	10.3.211.108/31	10.3.211.108 – 10.3.211.109	10.3.211.109
56	10.3.211.110/31	10.3.211.110 – 10.3.211.111	10.3.211.111
57	10.3.211.112/31	10.3.211.112 – 10.3.211.113	10.3.211.113
58	10.3.211.114/31	10.3.211.114 – 10.3.211.115	10.3.211.115
59	10.3.211.116/31	10.3.211.116 – 10.3.211.117	10.3.211.117
60	10.3.211.118/31	10.3.211.118 – 10.3.211.119	10.3.211.119
61	10.3.211.120/31	10.3.211.120 – 10.3.211.121	10.3.211.121
62	10.3.211.122/31	10.3.211.122 – 10.3.211.123	10.3.211.123
63	10.3.211.124/31	10.3.211.124 – 10.3.211.125	10.3.211.125
64	10.3.211.126/31	10.3.211.126 – 10.3.211.127	10.3.211.127
65	10.3.211.128/31	10.3.211.128 – 10.3.211.129	10.3.211.129
66	10.3.211.130/31	10.3.211.130 – 10.3.211.131	10.3.211.131
67	10.3.211.132/31	10.3.211.132 – 10.3.211.133	10.3.211.133
68	10.3.211.134/31	10.3.211.134 – 10.3.211.135	10.3.211.135
69	10.3.211.136/31	10.3.211.136 – 10.3.211.137	10.3.211.137
70	10.3.211.138/31	10.3.211.138 – 10.3.211.139	10.3.211.139
71	10.3.211.140/31	10.3.211.140 – 10.3.211.141	10.3.211.141
72	10.3.211.142/31	10.3.211.142 – 10.3.211.143	10.3.211.143
73	10.3.211.144/31	10.3.211.144 – 10.3.211.145	10.3.211.145
74	10.3.211.146/31	10.3.211.146 – 10.3.211.147	10.3.211.147
75	10.3.211.148/31	10.3.211.148 – 10.3.211.149	10.3.211.149
76	10.3.211.150/31	10.3.211.150 – 10.3.211.151	10.3.211.151
77	10.3.211.152/31	10.3.211.152 – 10.3.211.153	10.3.211.153
78	10.3.211.154/31	10.3.211.154 – 10.3.211.155	10.3.211.155
79	10.3.211.156/31	10.3.211.156 – 10.3.211.157	10.3.211.157
80	10.3.211.158/31	10.3.211.158 – 10.3.211.159	10.3.211.159
81	10.3.211.160/31	10.3.211.160 – 10.3.211.161	10.3.211.161
82	10.3.211.162/31	10.3.211.162 – 10.3.211.163	10.3.211.163
83	10.3.211.164/31	10.3.211.164 – 10.3.211.165	10.3.211.165
84	10.3.211.166/31	10.3.211.166 – 10.3.211.167	10.3.211.167
85	10.3.211.168/31	10.3.211.168 – 10.3.211.169	10.3.211.169
86	10.3.211.170/31	10.3.211.170 – 10.3.211.171	10.3.211.171
87	10.3.211.172/31	10.3.211.172 – 10.3.211.173	10.3.211.173
88	10.3.211.174/31	10.3.211.174 – 10.3.211.175	10.3.211.175
89	10.3.211.176/31	10.3.211.176 – 10.3.211.177	10.3.211.177
90	10.3.211.178/31	10.3.211.178 – 10.3.211.179	10.3.211.179
91	10.3.211.180/31	10.3.211.180 – 10.3.211.181	10.3.211.181
92	10.3.211.182/31	10.3.211.182 – 10.3.211.183	10.3.211.183
93	10.3.211.184/31	10.3.211.184 – 10.3.211.185	10.3.211.185
94	10.3.211.186/31	10.3.211.186 – 10.3.211.187	10.3.211.187
95	10.3.211.188/31	10.3.211.188 – 10.3.211.189	10.3.211.189
96	10.3.211.190/31	10.3.211.190 – 10.3.211.191	10.3.211.191
97	10.3.211.192/31	10.3.211.192 – 10.3.211.193	10.3.211.193
98	10.3.211.194/31	10.3.211.194 – 10.3.211.195	10.3.211.195
99	10.3.211.196/31	10.3.211.196 – 10.3.211.197	10.3.211.197
100	10.3.211.198/31	10.3.211.198 – 10.3.211.199	10.3.211.199
101	10.3.211.200/31	10.3.211.200 – 10.3.211.201	10.3.211.201
102	10.3.211.202/31	10.3.211.202 – 10.3.211.203	10.3.211.203
103	10.3.211.204/31	10.3.211.204 – 10.3.211.205	10.3.211.205
104	10.3.211.206/31	10.3.211.206 – 10.3.211.207	10.3.211.207
105	10.3.211.208/31	10.3.211.208 – 10.3.211.209	10.3.211.209
106	10.3.211.210/31	10.3.211.210 – 10.3.211.211	10.3.211.211
107	10.3.211.212/31	10.3.211.212 – 10.3.211.213	10.3.211.213
108	10.3.211.214/31	10.3.211.214 – 10.3.211.215	10.3.211.215
109	10.3.211.216/31	10.3.211.216 – 10.3.211.217	10.3.211.217
110	10.3.211.218/31	10.3.211.218 – 10.3.211.219	10.3.211.219
111	10.3.211.220/31	10.3.211.220 – 10.3.211.221	10.3.211.221
112	10.3.211.222/31	10.3.211.222 – 10.3.211.223	10.3.211.223
113	10.3.211.224/31	10.3.211.224 – 10.3.211.225	10.3.211.225
114	10.3.211.226/31	10.3.211.226 – 10.3.211.227	10.3.211.227
115	10.3.211.228/31	10.3.211.228 – 10.3.211.229	10.3.211.229
116	10.3.211.230/31	10.3.211.230 – 10.3.211.231	10.3.211.231
117	10.3.211.232/31	10.3.211.232 – 10.3.211.233	10.3.211.233
118	10.3.211.234/31	10.3.211.234 – 10.3.211.235	10.3.211.235
119	10.3.211.236/31	10.3.211.236 – 10.3.211.237	10.3.211.237
120	10.3.211.238/31	10.3.211.238 – 10.3.211.239	10.3.211.239
121	10.3.211.240/31	10.3.211.240 – 10.3.211.241	10.3.211.241
122	10.3.211.242/31	10.3.211.242 – 10.3.211.243	10.3.211.243
123	10.3.211.244/31	10.3.211.244 – 10.3.211.245	10.3.211.245
124	10.3.211.246/31	10.3.211.246 – 10.3.211.247	10.3.211.247
125	10.3.211.248/31	10.3.211.248 – 10.3.211.249	10.3.211.249
126	10.3.211.250/31	10.3.211.250 – 10.3.211.251	10.3.211.251
127	10.3.211.252/31	10.3.211.252 – 10.3.211.253	10.3.211.253
128	10.3.211.254/31	10.3.211.254 – 10.3.211.255	10.3.211.255

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 →