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)10.131.236.0/24

network10.131.236.0/24

broadcast10.131.236.255

first host10.131.236.1

last host10.131.236.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.131.236.0/24

address00001010.10000011.11101100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10000011.11101100.00000000

broadcast00001010.10000011.11101100.11111111

green = network part, grey = host part

hex0x0a83ec00

decimal176417792

reverse dns0.236.131.10.in-addr.arpa

ipv4-mapped::ffff:a83:ec00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.131.236.0/31	10.131.236.0 – 10.131.236.1	10.131.236.1
2	10.131.236.2/31	10.131.236.2 – 10.131.236.3	10.131.236.3
3	10.131.236.4/31	10.131.236.4 – 10.131.236.5	10.131.236.5
4	10.131.236.6/31	10.131.236.6 – 10.131.236.7	10.131.236.7
5	10.131.236.8/31	10.131.236.8 – 10.131.236.9	10.131.236.9
6	10.131.236.10/31	10.131.236.10 – 10.131.236.11	10.131.236.11
7	10.131.236.12/31	10.131.236.12 – 10.131.236.13	10.131.236.13
8	10.131.236.14/31	10.131.236.14 – 10.131.236.15	10.131.236.15
9	10.131.236.16/31	10.131.236.16 – 10.131.236.17	10.131.236.17
10	10.131.236.18/31	10.131.236.18 – 10.131.236.19	10.131.236.19
11	10.131.236.20/31	10.131.236.20 – 10.131.236.21	10.131.236.21
12	10.131.236.22/31	10.131.236.22 – 10.131.236.23	10.131.236.23
13	10.131.236.24/31	10.131.236.24 – 10.131.236.25	10.131.236.25
14	10.131.236.26/31	10.131.236.26 – 10.131.236.27	10.131.236.27
15	10.131.236.28/31	10.131.236.28 – 10.131.236.29	10.131.236.29
16	10.131.236.30/31	10.131.236.30 – 10.131.236.31	10.131.236.31
17	10.131.236.32/31	10.131.236.32 – 10.131.236.33	10.131.236.33
18	10.131.236.34/31	10.131.236.34 – 10.131.236.35	10.131.236.35
19	10.131.236.36/31	10.131.236.36 – 10.131.236.37	10.131.236.37
20	10.131.236.38/31	10.131.236.38 – 10.131.236.39	10.131.236.39
21	10.131.236.40/31	10.131.236.40 – 10.131.236.41	10.131.236.41
22	10.131.236.42/31	10.131.236.42 – 10.131.236.43	10.131.236.43
23	10.131.236.44/31	10.131.236.44 – 10.131.236.45	10.131.236.45
24	10.131.236.46/31	10.131.236.46 – 10.131.236.47	10.131.236.47
25	10.131.236.48/31	10.131.236.48 – 10.131.236.49	10.131.236.49
26	10.131.236.50/31	10.131.236.50 – 10.131.236.51	10.131.236.51
27	10.131.236.52/31	10.131.236.52 – 10.131.236.53	10.131.236.53
28	10.131.236.54/31	10.131.236.54 – 10.131.236.55	10.131.236.55
29	10.131.236.56/31	10.131.236.56 – 10.131.236.57	10.131.236.57
30	10.131.236.58/31	10.131.236.58 – 10.131.236.59	10.131.236.59
31	10.131.236.60/31	10.131.236.60 – 10.131.236.61	10.131.236.61
32	10.131.236.62/31	10.131.236.62 – 10.131.236.63	10.131.236.63
33	10.131.236.64/31	10.131.236.64 – 10.131.236.65	10.131.236.65
34	10.131.236.66/31	10.131.236.66 – 10.131.236.67	10.131.236.67
35	10.131.236.68/31	10.131.236.68 – 10.131.236.69	10.131.236.69
36	10.131.236.70/31	10.131.236.70 – 10.131.236.71	10.131.236.71
37	10.131.236.72/31	10.131.236.72 – 10.131.236.73	10.131.236.73
38	10.131.236.74/31	10.131.236.74 – 10.131.236.75	10.131.236.75
39	10.131.236.76/31	10.131.236.76 – 10.131.236.77	10.131.236.77
40	10.131.236.78/31	10.131.236.78 – 10.131.236.79	10.131.236.79
41	10.131.236.80/31	10.131.236.80 – 10.131.236.81	10.131.236.81
42	10.131.236.82/31	10.131.236.82 – 10.131.236.83	10.131.236.83
43	10.131.236.84/31	10.131.236.84 – 10.131.236.85	10.131.236.85
44	10.131.236.86/31	10.131.236.86 – 10.131.236.87	10.131.236.87
45	10.131.236.88/31	10.131.236.88 – 10.131.236.89	10.131.236.89
46	10.131.236.90/31	10.131.236.90 – 10.131.236.91	10.131.236.91
47	10.131.236.92/31	10.131.236.92 – 10.131.236.93	10.131.236.93
48	10.131.236.94/31	10.131.236.94 – 10.131.236.95	10.131.236.95
49	10.131.236.96/31	10.131.236.96 – 10.131.236.97	10.131.236.97
50	10.131.236.98/31	10.131.236.98 – 10.131.236.99	10.131.236.99
51	10.131.236.100/31	10.131.236.100 – 10.131.236.101	10.131.236.101
52	10.131.236.102/31	10.131.236.102 – 10.131.236.103	10.131.236.103
53	10.131.236.104/31	10.131.236.104 – 10.131.236.105	10.131.236.105
54	10.131.236.106/31	10.131.236.106 – 10.131.236.107	10.131.236.107
55	10.131.236.108/31	10.131.236.108 – 10.131.236.109	10.131.236.109
56	10.131.236.110/31	10.131.236.110 – 10.131.236.111	10.131.236.111
57	10.131.236.112/31	10.131.236.112 – 10.131.236.113	10.131.236.113
58	10.131.236.114/31	10.131.236.114 – 10.131.236.115	10.131.236.115
59	10.131.236.116/31	10.131.236.116 – 10.131.236.117	10.131.236.117
60	10.131.236.118/31	10.131.236.118 – 10.131.236.119	10.131.236.119
61	10.131.236.120/31	10.131.236.120 – 10.131.236.121	10.131.236.121
62	10.131.236.122/31	10.131.236.122 – 10.131.236.123	10.131.236.123
63	10.131.236.124/31	10.131.236.124 – 10.131.236.125	10.131.236.125
64	10.131.236.126/31	10.131.236.126 – 10.131.236.127	10.131.236.127
65	10.131.236.128/31	10.131.236.128 – 10.131.236.129	10.131.236.129
66	10.131.236.130/31	10.131.236.130 – 10.131.236.131	10.131.236.131
67	10.131.236.132/31	10.131.236.132 – 10.131.236.133	10.131.236.133
68	10.131.236.134/31	10.131.236.134 – 10.131.236.135	10.131.236.135
69	10.131.236.136/31	10.131.236.136 – 10.131.236.137	10.131.236.137
70	10.131.236.138/31	10.131.236.138 – 10.131.236.139	10.131.236.139
71	10.131.236.140/31	10.131.236.140 – 10.131.236.141	10.131.236.141
72	10.131.236.142/31	10.131.236.142 – 10.131.236.143	10.131.236.143
73	10.131.236.144/31	10.131.236.144 – 10.131.236.145	10.131.236.145
74	10.131.236.146/31	10.131.236.146 – 10.131.236.147	10.131.236.147
75	10.131.236.148/31	10.131.236.148 – 10.131.236.149	10.131.236.149
76	10.131.236.150/31	10.131.236.150 – 10.131.236.151	10.131.236.151
77	10.131.236.152/31	10.131.236.152 – 10.131.236.153	10.131.236.153
78	10.131.236.154/31	10.131.236.154 – 10.131.236.155	10.131.236.155
79	10.131.236.156/31	10.131.236.156 – 10.131.236.157	10.131.236.157
80	10.131.236.158/31	10.131.236.158 – 10.131.236.159	10.131.236.159
81	10.131.236.160/31	10.131.236.160 – 10.131.236.161	10.131.236.161
82	10.131.236.162/31	10.131.236.162 – 10.131.236.163	10.131.236.163
83	10.131.236.164/31	10.131.236.164 – 10.131.236.165	10.131.236.165
84	10.131.236.166/31	10.131.236.166 – 10.131.236.167	10.131.236.167
85	10.131.236.168/31	10.131.236.168 – 10.131.236.169	10.131.236.169
86	10.131.236.170/31	10.131.236.170 – 10.131.236.171	10.131.236.171
87	10.131.236.172/31	10.131.236.172 – 10.131.236.173	10.131.236.173
88	10.131.236.174/31	10.131.236.174 – 10.131.236.175	10.131.236.175
89	10.131.236.176/31	10.131.236.176 – 10.131.236.177	10.131.236.177
90	10.131.236.178/31	10.131.236.178 – 10.131.236.179	10.131.236.179
91	10.131.236.180/31	10.131.236.180 – 10.131.236.181	10.131.236.181
92	10.131.236.182/31	10.131.236.182 – 10.131.236.183	10.131.236.183
93	10.131.236.184/31	10.131.236.184 – 10.131.236.185	10.131.236.185
94	10.131.236.186/31	10.131.236.186 – 10.131.236.187	10.131.236.187
95	10.131.236.188/31	10.131.236.188 – 10.131.236.189	10.131.236.189
96	10.131.236.190/31	10.131.236.190 – 10.131.236.191	10.131.236.191
97	10.131.236.192/31	10.131.236.192 – 10.131.236.193	10.131.236.193
98	10.131.236.194/31	10.131.236.194 – 10.131.236.195	10.131.236.195
99	10.131.236.196/31	10.131.236.196 – 10.131.236.197	10.131.236.197
100	10.131.236.198/31	10.131.236.198 – 10.131.236.199	10.131.236.199
101	10.131.236.200/31	10.131.236.200 – 10.131.236.201	10.131.236.201
102	10.131.236.202/31	10.131.236.202 – 10.131.236.203	10.131.236.203
103	10.131.236.204/31	10.131.236.204 – 10.131.236.205	10.131.236.205
104	10.131.236.206/31	10.131.236.206 – 10.131.236.207	10.131.236.207
105	10.131.236.208/31	10.131.236.208 – 10.131.236.209	10.131.236.209
106	10.131.236.210/31	10.131.236.210 – 10.131.236.211	10.131.236.211
107	10.131.236.212/31	10.131.236.212 – 10.131.236.213	10.131.236.213
108	10.131.236.214/31	10.131.236.214 – 10.131.236.215	10.131.236.215
109	10.131.236.216/31	10.131.236.216 – 10.131.236.217	10.131.236.217
110	10.131.236.218/31	10.131.236.218 – 10.131.236.219	10.131.236.219
111	10.131.236.220/31	10.131.236.220 – 10.131.236.221	10.131.236.221
112	10.131.236.222/31	10.131.236.222 – 10.131.236.223	10.131.236.223
113	10.131.236.224/31	10.131.236.224 – 10.131.236.225	10.131.236.225
114	10.131.236.226/31	10.131.236.226 – 10.131.236.227	10.131.236.227
115	10.131.236.228/31	10.131.236.228 – 10.131.236.229	10.131.236.229
116	10.131.236.230/31	10.131.236.230 – 10.131.236.231	10.131.236.231
117	10.131.236.232/31	10.131.236.232 – 10.131.236.233	10.131.236.233
118	10.131.236.234/31	10.131.236.234 – 10.131.236.235	10.131.236.235
119	10.131.236.236/31	10.131.236.236 – 10.131.236.237	10.131.236.237
120	10.131.236.238/31	10.131.236.238 – 10.131.236.239	10.131.236.239
121	10.131.236.240/31	10.131.236.240 – 10.131.236.241	10.131.236.241
122	10.131.236.242/31	10.131.236.242 – 10.131.236.243	10.131.236.243
123	10.131.236.244/31	10.131.236.244 – 10.131.236.245	10.131.236.245
124	10.131.236.246/31	10.131.236.246 – 10.131.236.247	10.131.236.247
125	10.131.236.248/31	10.131.236.248 – 10.131.236.249	10.131.236.249
126	10.131.236.250/31	10.131.236.250 – 10.131.236.251	10.131.236.251
127	10.131.236.252/31	10.131.236.252 – 10.131.236.253	10.131.236.253
128	10.131.236.254/31	10.131.236.254 – 10.131.236.255	10.131.236.255

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 →