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)10.166.131.0/24

network10.166.131.0/24

broadcast10.166.131.255

first host10.166.131.1

last host10.166.131.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.166.131.0/24

address00001010.10100110.10000011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10100110.10000011.00000000

broadcast00001010.10100110.10000011.11111111

green = network part, grey = host part

hex0x0aa68300

decimal178684672

reverse dns0.131.166.10.in-addr.arpa

ipv4-mapped::ffff:aa6:8300

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.166.131.0/31	10.166.131.0 – 10.166.131.1	10.166.131.1
2	10.166.131.2/31	10.166.131.2 – 10.166.131.3	10.166.131.3
3	10.166.131.4/31	10.166.131.4 – 10.166.131.5	10.166.131.5
4	10.166.131.6/31	10.166.131.6 – 10.166.131.7	10.166.131.7
5	10.166.131.8/31	10.166.131.8 – 10.166.131.9	10.166.131.9
6	10.166.131.10/31	10.166.131.10 – 10.166.131.11	10.166.131.11
7	10.166.131.12/31	10.166.131.12 – 10.166.131.13	10.166.131.13
8	10.166.131.14/31	10.166.131.14 – 10.166.131.15	10.166.131.15
9	10.166.131.16/31	10.166.131.16 – 10.166.131.17	10.166.131.17
10	10.166.131.18/31	10.166.131.18 – 10.166.131.19	10.166.131.19
11	10.166.131.20/31	10.166.131.20 – 10.166.131.21	10.166.131.21
12	10.166.131.22/31	10.166.131.22 – 10.166.131.23	10.166.131.23
13	10.166.131.24/31	10.166.131.24 – 10.166.131.25	10.166.131.25
14	10.166.131.26/31	10.166.131.26 – 10.166.131.27	10.166.131.27
15	10.166.131.28/31	10.166.131.28 – 10.166.131.29	10.166.131.29
16	10.166.131.30/31	10.166.131.30 – 10.166.131.31	10.166.131.31
17	10.166.131.32/31	10.166.131.32 – 10.166.131.33	10.166.131.33
18	10.166.131.34/31	10.166.131.34 – 10.166.131.35	10.166.131.35
19	10.166.131.36/31	10.166.131.36 – 10.166.131.37	10.166.131.37
20	10.166.131.38/31	10.166.131.38 – 10.166.131.39	10.166.131.39
21	10.166.131.40/31	10.166.131.40 – 10.166.131.41	10.166.131.41
22	10.166.131.42/31	10.166.131.42 – 10.166.131.43	10.166.131.43
23	10.166.131.44/31	10.166.131.44 – 10.166.131.45	10.166.131.45
24	10.166.131.46/31	10.166.131.46 – 10.166.131.47	10.166.131.47
25	10.166.131.48/31	10.166.131.48 – 10.166.131.49	10.166.131.49
26	10.166.131.50/31	10.166.131.50 – 10.166.131.51	10.166.131.51
27	10.166.131.52/31	10.166.131.52 – 10.166.131.53	10.166.131.53
28	10.166.131.54/31	10.166.131.54 – 10.166.131.55	10.166.131.55
29	10.166.131.56/31	10.166.131.56 – 10.166.131.57	10.166.131.57
30	10.166.131.58/31	10.166.131.58 – 10.166.131.59	10.166.131.59
31	10.166.131.60/31	10.166.131.60 – 10.166.131.61	10.166.131.61
32	10.166.131.62/31	10.166.131.62 – 10.166.131.63	10.166.131.63
33	10.166.131.64/31	10.166.131.64 – 10.166.131.65	10.166.131.65
34	10.166.131.66/31	10.166.131.66 – 10.166.131.67	10.166.131.67
35	10.166.131.68/31	10.166.131.68 – 10.166.131.69	10.166.131.69
36	10.166.131.70/31	10.166.131.70 – 10.166.131.71	10.166.131.71
37	10.166.131.72/31	10.166.131.72 – 10.166.131.73	10.166.131.73
38	10.166.131.74/31	10.166.131.74 – 10.166.131.75	10.166.131.75
39	10.166.131.76/31	10.166.131.76 – 10.166.131.77	10.166.131.77
40	10.166.131.78/31	10.166.131.78 – 10.166.131.79	10.166.131.79
41	10.166.131.80/31	10.166.131.80 – 10.166.131.81	10.166.131.81
42	10.166.131.82/31	10.166.131.82 – 10.166.131.83	10.166.131.83
43	10.166.131.84/31	10.166.131.84 – 10.166.131.85	10.166.131.85
44	10.166.131.86/31	10.166.131.86 – 10.166.131.87	10.166.131.87
45	10.166.131.88/31	10.166.131.88 – 10.166.131.89	10.166.131.89
46	10.166.131.90/31	10.166.131.90 – 10.166.131.91	10.166.131.91
47	10.166.131.92/31	10.166.131.92 – 10.166.131.93	10.166.131.93
48	10.166.131.94/31	10.166.131.94 – 10.166.131.95	10.166.131.95
49	10.166.131.96/31	10.166.131.96 – 10.166.131.97	10.166.131.97
50	10.166.131.98/31	10.166.131.98 – 10.166.131.99	10.166.131.99
51	10.166.131.100/31	10.166.131.100 – 10.166.131.101	10.166.131.101
52	10.166.131.102/31	10.166.131.102 – 10.166.131.103	10.166.131.103
53	10.166.131.104/31	10.166.131.104 – 10.166.131.105	10.166.131.105
54	10.166.131.106/31	10.166.131.106 – 10.166.131.107	10.166.131.107
55	10.166.131.108/31	10.166.131.108 – 10.166.131.109	10.166.131.109
56	10.166.131.110/31	10.166.131.110 – 10.166.131.111	10.166.131.111
57	10.166.131.112/31	10.166.131.112 – 10.166.131.113	10.166.131.113
58	10.166.131.114/31	10.166.131.114 – 10.166.131.115	10.166.131.115
59	10.166.131.116/31	10.166.131.116 – 10.166.131.117	10.166.131.117
60	10.166.131.118/31	10.166.131.118 – 10.166.131.119	10.166.131.119
61	10.166.131.120/31	10.166.131.120 – 10.166.131.121	10.166.131.121
62	10.166.131.122/31	10.166.131.122 – 10.166.131.123	10.166.131.123
63	10.166.131.124/31	10.166.131.124 – 10.166.131.125	10.166.131.125
64	10.166.131.126/31	10.166.131.126 – 10.166.131.127	10.166.131.127
65	10.166.131.128/31	10.166.131.128 – 10.166.131.129	10.166.131.129
66	10.166.131.130/31	10.166.131.130 – 10.166.131.131	10.166.131.131
67	10.166.131.132/31	10.166.131.132 – 10.166.131.133	10.166.131.133
68	10.166.131.134/31	10.166.131.134 – 10.166.131.135	10.166.131.135
69	10.166.131.136/31	10.166.131.136 – 10.166.131.137	10.166.131.137
70	10.166.131.138/31	10.166.131.138 – 10.166.131.139	10.166.131.139
71	10.166.131.140/31	10.166.131.140 – 10.166.131.141	10.166.131.141
72	10.166.131.142/31	10.166.131.142 – 10.166.131.143	10.166.131.143
73	10.166.131.144/31	10.166.131.144 – 10.166.131.145	10.166.131.145
74	10.166.131.146/31	10.166.131.146 – 10.166.131.147	10.166.131.147
75	10.166.131.148/31	10.166.131.148 – 10.166.131.149	10.166.131.149
76	10.166.131.150/31	10.166.131.150 – 10.166.131.151	10.166.131.151
77	10.166.131.152/31	10.166.131.152 – 10.166.131.153	10.166.131.153
78	10.166.131.154/31	10.166.131.154 – 10.166.131.155	10.166.131.155
79	10.166.131.156/31	10.166.131.156 – 10.166.131.157	10.166.131.157
80	10.166.131.158/31	10.166.131.158 – 10.166.131.159	10.166.131.159
81	10.166.131.160/31	10.166.131.160 – 10.166.131.161	10.166.131.161
82	10.166.131.162/31	10.166.131.162 – 10.166.131.163	10.166.131.163
83	10.166.131.164/31	10.166.131.164 – 10.166.131.165	10.166.131.165
84	10.166.131.166/31	10.166.131.166 – 10.166.131.167	10.166.131.167
85	10.166.131.168/31	10.166.131.168 – 10.166.131.169	10.166.131.169
86	10.166.131.170/31	10.166.131.170 – 10.166.131.171	10.166.131.171
87	10.166.131.172/31	10.166.131.172 – 10.166.131.173	10.166.131.173
88	10.166.131.174/31	10.166.131.174 – 10.166.131.175	10.166.131.175
89	10.166.131.176/31	10.166.131.176 – 10.166.131.177	10.166.131.177
90	10.166.131.178/31	10.166.131.178 – 10.166.131.179	10.166.131.179
91	10.166.131.180/31	10.166.131.180 – 10.166.131.181	10.166.131.181
92	10.166.131.182/31	10.166.131.182 – 10.166.131.183	10.166.131.183
93	10.166.131.184/31	10.166.131.184 – 10.166.131.185	10.166.131.185
94	10.166.131.186/31	10.166.131.186 – 10.166.131.187	10.166.131.187
95	10.166.131.188/31	10.166.131.188 – 10.166.131.189	10.166.131.189
96	10.166.131.190/31	10.166.131.190 – 10.166.131.191	10.166.131.191
97	10.166.131.192/31	10.166.131.192 – 10.166.131.193	10.166.131.193
98	10.166.131.194/31	10.166.131.194 – 10.166.131.195	10.166.131.195
99	10.166.131.196/31	10.166.131.196 – 10.166.131.197	10.166.131.197
100	10.166.131.198/31	10.166.131.198 – 10.166.131.199	10.166.131.199
101	10.166.131.200/31	10.166.131.200 – 10.166.131.201	10.166.131.201
102	10.166.131.202/31	10.166.131.202 – 10.166.131.203	10.166.131.203
103	10.166.131.204/31	10.166.131.204 – 10.166.131.205	10.166.131.205
104	10.166.131.206/31	10.166.131.206 – 10.166.131.207	10.166.131.207
105	10.166.131.208/31	10.166.131.208 – 10.166.131.209	10.166.131.209
106	10.166.131.210/31	10.166.131.210 – 10.166.131.211	10.166.131.211
107	10.166.131.212/31	10.166.131.212 – 10.166.131.213	10.166.131.213
108	10.166.131.214/31	10.166.131.214 – 10.166.131.215	10.166.131.215
109	10.166.131.216/31	10.166.131.216 – 10.166.131.217	10.166.131.217
110	10.166.131.218/31	10.166.131.218 – 10.166.131.219	10.166.131.219
111	10.166.131.220/31	10.166.131.220 – 10.166.131.221	10.166.131.221
112	10.166.131.222/31	10.166.131.222 – 10.166.131.223	10.166.131.223
113	10.166.131.224/31	10.166.131.224 – 10.166.131.225	10.166.131.225
114	10.166.131.226/31	10.166.131.226 – 10.166.131.227	10.166.131.227
115	10.166.131.228/31	10.166.131.228 – 10.166.131.229	10.166.131.229
116	10.166.131.230/31	10.166.131.230 – 10.166.131.231	10.166.131.231
117	10.166.131.232/31	10.166.131.232 – 10.166.131.233	10.166.131.233
118	10.166.131.234/31	10.166.131.234 – 10.166.131.235	10.166.131.235
119	10.166.131.236/31	10.166.131.236 – 10.166.131.237	10.166.131.237
120	10.166.131.238/31	10.166.131.238 – 10.166.131.239	10.166.131.239
121	10.166.131.240/31	10.166.131.240 – 10.166.131.241	10.166.131.241
122	10.166.131.242/31	10.166.131.242 – 10.166.131.243	10.166.131.243
123	10.166.131.244/31	10.166.131.244 – 10.166.131.245	10.166.131.245
124	10.166.131.246/31	10.166.131.246 – 10.166.131.247	10.166.131.247
125	10.166.131.248/31	10.166.131.248 – 10.166.131.249	10.166.131.249
126	10.166.131.250/31	10.166.131.250 – 10.166.131.251	10.166.131.251
127	10.166.131.252/31	10.166.131.252 – 10.166.131.253	10.166.131.253
128	10.166.131.254/31	10.166.131.254 – 10.166.131.255	10.166.131.255

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 →