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)10.166.83.0/24

network10.166.83.0/24

broadcast10.166.83.255

first host10.166.83.1

last host10.166.83.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.166.83.0/24

address00001010.10100110.01010011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10100110.01010011.00000000

broadcast00001010.10100110.01010011.11111111

green = network part, grey = host part

hex0x0aa65300

decimal178672384

reverse dns0.83.166.10.in-addr.arpa

ipv4-mapped::ffff:aa6:5300

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.166.83.0/31	10.166.83.0 – 10.166.83.1	10.166.83.1
2	10.166.83.2/31	10.166.83.2 – 10.166.83.3	10.166.83.3
3	10.166.83.4/31	10.166.83.4 – 10.166.83.5	10.166.83.5
4	10.166.83.6/31	10.166.83.6 – 10.166.83.7	10.166.83.7
5	10.166.83.8/31	10.166.83.8 – 10.166.83.9	10.166.83.9
6	10.166.83.10/31	10.166.83.10 – 10.166.83.11	10.166.83.11
7	10.166.83.12/31	10.166.83.12 – 10.166.83.13	10.166.83.13
8	10.166.83.14/31	10.166.83.14 – 10.166.83.15	10.166.83.15
9	10.166.83.16/31	10.166.83.16 – 10.166.83.17	10.166.83.17
10	10.166.83.18/31	10.166.83.18 – 10.166.83.19	10.166.83.19
11	10.166.83.20/31	10.166.83.20 – 10.166.83.21	10.166.83.21
12	10.166.83.22/31	10.166.83.22 – 10.166.83.23	10.166.83.23
13	10.166.83.24/31	10.166.83.24 – 10.166.83.25	10.166.83.25
14	10.166.83.26/31	10.166.83.26 – 10.166.83.27	10.166.83.27
15	10.166.83.28/31	10.166.83.28 – 10.166.83.29	10.166.83.29
16	10.166.83.30/31	10.166.83.30 – 10.166.83.31	10.166.83.31
17	10.166.83.32/31	10.166.83.32 – 10.166.83.33	10.166.83.33
18	10.166.83.34/31	10.166.83.34 – 10.166.83.35	10.166.83.35
19	10.166.83.36/31	10.166.83.36 – 10.166.83.37	10.166.83.37
20	10.166.83.38/31	10.166.83.38 – 10.166.83.39	10.166.83.39
21	10.166.83.40/31	10.166.83.40 – 10.166.83.41	10.166.83.41
22	10.166.83.42/31	10.166.83.42 – 10.166.83.43	10.166.83.43
23	10.166.83.44/31	10.166.83.44 – 10.166.83.45	10.166.83.45
24	10.166.83.46/31	10.166.83.46 – 10.166.83.47	10.166.83.47
25	10.166.83.48/31	10.166.83.48 – 10.166.83.49	10.166.83.49
26	10.166.83.50/31	10.166.83.50 – 10.166.83.51	10.166.83.51
27	10.166.83.52/31	10.166.83.52 – 10.166.83.53	10.166.83.53
28	10.166.83.54/31	10.166.83.54 – 10.166.83.55	10.166.83.55
29	10.166.83.56/31	10.166.83.56 – 10.166.83.57	10.166.83.57
30	10.166.83.58/31	10.166.83.58 – 10.166.83.59	10.166.83.59
31	10.166.83.60/31	10.166.83.60 – 10.166.83.61	10.166.83.61
32	10.166.83.62/31	10.166.83.62 – 10.166.83.63	10.166.83.63
33	10.166.83.64/31	10.166.83.64 – 10.166.83.65	10.166.83.65
34	10.166.83.66/31	10.166.83.66 – 10.166.83.67	10.166.83.67
35	10.166.83.68/31	10.166.83.68 – 10.166.83.69	10.166.83.69
36	10.166.83.70/31	10.166.83.70 – 10.166.83.71	10.166.83.71
37	10.166.83.72/31	10.166.83.72 – 10.166.83.73	10.166.83.73
38	10.166.83.74/31	10.166.83.74 – 10.166.83.75	10.166.83.75
39	10.166.83.76/31	10.166.83.76 – 10.166.83.77	10.166.83.77
40	10.166.83.78/31	10.166.83.78 – 10.166.83.79	10.166.83.79
41	10.166.83.80/31	10.166.83.80 – 10.166.83.81	10.166.83.81
42	10.166.83.82/31	10.166.83.82 – 10.166.83.83	10.166.83.83
43	10.166.83.84/31	10.166.83.84 – 10.166.83.85	10.166.83.85
44	10.166.83.86/31	10.166.83.86 – 10.166.83.87	10.166.83.87
45	10.166.83.88/31	10.166.83.88 – 10.166.83.89	10.166.83.89
46	10.166.83.90/31	10.166.83.90 – 10.166.83.91	10.166.83.91
47	10.166.83.92/31	10.166.83.92 – 10.166.83.93	10.166.83.93
48	10.166.83.94/31	10.166.83.94 – 10.166.83.95	10.166.83.95
49	10.166.83.96/31	10.166.83.96 – 10.166.83.97	10.166.83.97
50	10.166.83.98/31	10.166.83.98 – 10.166.83.99	10.166.83.99
51	10.166.83.100/31	10.166.83.100 – 10.166.83.101	10.166.83.101
52	10.166.83.102/31	10.166.83.102 – 10.166.83.103	10.166.83.103
53	10.166.83.104/31	10.166.83.104 – 10.166.83.105	10.166.83.105
54	10.166.83.106/31	10.166.83.106 – 10.166.83.107	10.166.83.107
55	10.166.83.108/31	10.166.83.108 – 10.166.83.109	10.166.83.109
56	10.166.83.110/31	10.166.83.110 – 10.166.83.111	10.166.83.111
57	10.166.83.112/31	10.166.83.112 – 10.166.83.113	10.166.83.113
58	10.166.83.114/31	10.166.83.114 – 10.166.83.115	10.166.83.115
59	10.166.83.116/31	10.166.83.116 – 10.166.83.117	10.166.83.117
60	10.166.83.118/31	10.166.83.118 – 10.166.83.119	10.166.83.119
61	10.166.83.120/31	10.166.83.120 – 10.166.83.121	10.166.83.121
62	10.166.83.122/31	10.166.83.122 – 10.166.83.123	10.166.83.123
63	10.166.83.124/31	10.166.83.124 – 10.166.83.125	10.166.83.125
64	10.166.83.126/31	10.166.83.126 – 10.166.83.127	10.166.83.127
65	10.166.83.128/31	10.166.83.128 – 10.166.83.129	10.166.83.129
66	10.166.83.130/31	10.166.83.130 – 10.166.83.131	10.166.83.131
67	10.166.83.132/31	10.166.83.132 – 10.166.83.133	10.166.83.133
68	10.166.83.134/31	10.166.83.134 – 10.166.83.135	10.166.83.135
69	10.166.83.136/31	10.166.83.136 – 10.166.83.137	10.166.83.137
70	10.166.83.138/31	10.166.83.138 – 10.166.83.139	10.166.83.139
71	10.166.83.140/31	10.166.83.140 – 10.166.83.141	10.166.83.141
72	10.166.83.142/31	10.166.83.142 – 10.166.83.143	10.166.83.143
73	10.166.83.144/31	10.166.83.144 – 10.166.83.145	10.166.83.145
74	10.166.83.146/31	10.166.83.146 – 10.166.83.147	10.166.83.147
75	10.166.83.148/31	10.166.83.148 – 10.166.83.149	10.166.83.149
76	10.166.83.150/31	10.166.83.150 – 10.166.83.151	10.166.83.151
77	10.166.83.152/31	10.166.83.152 – 10.166.83.153	10.166.83.153
78	10.166.83.154/31	10.166.83.154 – 10.166.83.155	10.166.83.155
79	10.166.83.156/31	10.166.83.156 – 10.166.83.157	10.166.83.157
80	10.166.83.158/31	10.166.83.158 – 10.166.83.159	10.166.83.159
81	10.166.83.160/31	10.166.83.160 – 10.166.83.161	10.166.83.161
82	10.166.83.162/31	10.166.83.162 – 10.166.83.163	10.166.83.163
83	10.166.83.164/31	10.166.83.164 – 10.166.83.165	10.166.83.165
84	10.166.83.166/31	10.166.83.166 – 10.166.83.167	10.166.83.167
85	10.166.83.168/31	10.166.83.168 – 10.166.83.169	10.166.83.169
86	10.166.83.170/31	10.166.83.170 – 10.166.83.171	10.166.83.171
87	10.166.83.172/31	10.166.83.172 – 10.166.83.173	10.166.83.173
88	10.166.83.174/31	10.166.83.174 – 10.166.83.175	10.166.83.175
89	10.166.83.176/31	10.166.83.176 – 10.166.83.177	10.166.83.177
90	10.166.83.178/31	10.166.83.178 – 10.166.83.179	10.166.83.179
91	10.166.83.180/31	10.166.83.180 – 10.166.83.181	10.166.83.181
92	10.166.83.182/31	10.166.83.182 – 10.166.83.183	10.166.83.183
93	10.166.83.184/31	10.166.83.184 – 10.166.83.185	10.166.83.185
94	10.166.83.186/31	10.166.83.186 – 10.166.83.187	10.166.83.187
95	10.166.83.188/31	10.166.83.188 – 10.166.83.189	10.166.83.189
96	10.166.83.190/31	10.166.83.190 – 10.166.83.191	10.166.83.191
97	10.166.83.192/31	10.166.83.192 – 10.166.83.193	10.166.83.193
98	10.166.83.194/31	10.166.83.194 – 10.166.83.195	10.166.83.195
99	10.166.83.196/31	10.166.83.196 – 10.166.83.197	10.166.83.197
100	10.166.83.198/31	10.166.83.198 – 10.166.83.199	10.166.83.199
101	10.166.83.200/31	10.166.83.200 – 10.166.83.201	10.166.83.201
102	10.166.83.202/31	10.166.83.202 – 10.166.83.203	10.166.83.203
103	10.166.83.204/31	10.166.83.204 – 10.166.83.205	10.166.83.205
104	10.166.83.206/31	10.166.83.206 – 10.166.83.207	10.166.83.207
105	10.166.83.208/31	10.166.83.208 – 10.166.83.209	10.166.83.209
106	10.166.83.210/31	10.166.83.210 – 10.166.83.211	10.166.83.211
107	10.166.83.212/31	10.166.83.212 – 10.166.83.213	10.166.83.213
108	10.166.83.214/31	10.166.83.214 – 10.166.83.215	10.166.83.215
109	10.166.83.216/31	10.166.83.216 – 10.166.83.217	10.166.83.217
110	10.166.83.218/31	10.166.83.218 – 10.166.83.219	10.166.83.219
111	10.166.83.220/31	10.166.83.220 – 10.166.83.221	10.166.83.221
112	10.166.83.222/31	10.166.83.222 – 10.166.83.223	10.166.83.223
113	10.166.83.224/31	10.166.83.224 – 10.166.83.225	10.166.83.225
114	10.166.83.226/31	10.166.83.226 – 10.166.83.227	10.166.83.227
115	10.166.83.228/31	10.166.83.228 – 10.166.83.229	10.166.83.229
116	10.166.83.230/31	10.166.83.230 – 10.166.83.231	10.166.83.231
117	10.166.83.232/31	10.166.83.232 – 10.166.83.233	10.166.83.233
118	10.166.83.234/31	10.166.83.234 – 10.166.83.235	10.166.83.235
119	10.166.83.236/31	10.166.83.236 – 10.166.83.237	10.166.83.237
120	10.166.83.238/31	10.166.83.238 – 10.166.83.239	10.166.83.239
121	10.166.83.240/31	10.166.83.240 – 10.166.83.241	10.166.83.241
122	10.166.83.242/31	10.166.83.242 – 10.166.83.243	10.166.83.243
123	10.166.83.244/31	10.166.83.244 – 10.166.83.245	10.166.83.245
124	10.166.83.246/31	10.166.83.246 – 10.166.83.247	10.166.83.247
125	10.166.83.248/31	10.166.83.248 – 10.166.83.249	10.166.83.249
126	10.166.83.250/31	10.166.83.250 – 10.166.83.251	10.166.83.251
127	10.166.83.252/31	10.166.83.252 – 10.166.83.253	10.166.83.253
128	10.166.83.254/31	10.166.83.254 – 10.166.83.255	10.166.83.255

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 →