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)10.2.133.0/24

network10.2.133.0/24

broadcast10.2.133.255

first host10.2.133.1

last host10.2.133.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.133.0/24

address00001010.00000010.10000101.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.10000101.00000000

broadcast00001010.00000010.10000101.11111111

green = network part, grey = host part

hex0x0a028500

decimal167937280

reverse dns0.133.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:8500

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.133.0/31	10.2.133.0 – 10.2.133.1	10.2.133.1
2	10.2.133.2/31	10.2.133.2 – 10.2.133.3	10.2.133.3
3	10.2.133.4/31	10.2.133.4 – 10.2.133.5	10.2.133.5
4	10.2.133.6/31	10.2.133.6 – 10.2.133.7	10.2.133.7
5	10.2.133.8/31	10.2.133.8 – 10.2.133.9	10.2.133.9
6	10.2.133.10/31	10.2.133.10 – 10.2.133.11	10.2.133.11
7	10.2.133.12/31	10.2.133.12 – 10.2.133.13	10.2.133.13
8	10.2.133.14/31	10.2.133.14 – 10.2.133.15	10.2.133.15
9	10.2.133.16/31	10.2.133.16 – 10.2.133.17	10.2.133.17
10	10.2.133.18/31	10.2.133.18 – 10.2.133.19	10.2.133.19
11	10.2.133.20/31	10.2.133.20 – 10.2.133.21	10.2.133.21
12	10.2.133.22/31	10.2.133.22 – 10.2.133.23	10.2.133.23
13	10.2.133.24/31	10.2.133.24 – 10.2.133.25	10.2.133.25
14	10.2.133.26/31	10.2.133.26 – 10.2.133.27	10.2.133.27
15	10.2.133.28/31	10.2.133.28 – 10.2.133.29	10.2.133.29
16	10.2.133.30/31	10.2.133.30 – 10.2.133.31	10.2.133.31
17	10.2.133.32/31	10.2.133.32 – 10.2.133.33	10.2.133.33
18	10.2.133.34/31	10.2.133.34 – 10.2.133.35	10.2.133.35
19	10.2.133.36/31	10.2.133.36 – 10.2.133.37	10.2.133.37
20	10.2.133.38/31	10.2.133.38 – 10.2.133.39	10.2.133.39
21	10.2.133.40/31	10.2.133.40 – 10.2.133.41	10.2.133.41
22	10.2.133.42/31	10.2.133.42 – 10.2.133.43	10.2.133.43
23	10.2.133.44/31	10.2.133.44 – 10.2.133.45	10.2.133.45
24	10.2.133.46/31	10.2.133.46 – 10.2.133.47	10.2.133.47
25	10.2.133.48/31	10.2.133.48 – 10.2.133.49	10.2.133.49
26	10.2.133.50/31	10.2.133.50 – 10.2.133.51	10.2.133.51
27	10.2.133.52/31	10.2.133.52 – 10.2.133.53	10.2.133.53
28	10.2.133.54/31	10.2.133.54 – 10.2.133.55	10.2.133.55
29	10.2.133.56/31	10.2.133.56 – 10.2.133.57	10.2.133.57
30	10.2.133.58/31	10.2.133.58 – 10.2.133.59	10.2.133.59
31	10.2.133.60/31	10.2.133.60 – 10.2.133.61	10.2.133.61
32	10.2.133.62/31	10.2.133.62 – 10.2.133.63	10.2.133.63
33	10.2.133.64/31	10.2.133.64 – 10.2.133.65	10.2.133.65
34	10.2.133.66/31	10.2.133.66 – 10.2.133.67	10.2.133.67
35	10.2.133.68/31	10.2.133.68 – 10.2.133.69	10.2.133.69
36	10.2.133.70/31	10.2.133.70 – 10.2.133.71	10.2.133.71
37	10.2.133.72/31	10.2.133.72 – 10.2.133.73	10.2.133.73
38	10.2.133.74/31	10.2.133.74 – 10.2.133.75	10.2.133.75
39	10.2.133.76/31	10.2.133.76 – 10.2.133.77	10.2.133.77
40	10.2.133.78/31	10.2.133.78 – 10.2.133.79	10.2.133.79
41	10.2.133.80/31	10.2.133.80 – 10.2.133.81	10.2.133.81
42	10.2.133.82/31	10.2.133.82 – 10.2.133.83	10.2.133.83
43	10.2.133.84/31	10.2.133.84 – 10.2.133.85	10.2.133.85
44	10.2.133.86/31	10.2.133.86 – 10.2.133.87	10.2.133.87
45	10.2.133.88/31	10.2.133.88 – 10.2.133.89	10.2.133.89
46	10.2.133.90/31	10.2.133.90 – 10.2.133.91	10.2.133.91
47	10.2.133.92/31	10.2.133.92 – 10.2.133.93	10.2.133.93
48	10.2.133.94/31	10.2.133.94 – 10.2.133.95	10.2.133.95
49	10.2.133.96/31	10.2.133.96 – 10.2.133.97	10.2.133.97
50	10.2.133.98/31	10.2.133.98 – 10.2.133.99	10.2.133.99
51	10.2.133.100/31	10.2.133.100 – 10.2.133.101	10.2.133.101
52	10.2.133.102/31	10.2.133.102 – 10.2.133.103	10.2.133.103
53	10.2.133.104/31	10.2.133.104 – 10.2.133.105	10.2.133.105
54	10.2.133.106/31	10.2.133.106 – 10.2.133.107	10.2.133.107
55	10.2.133.108/31	10.2.133.108 – 10.2.133.109	10.2.133.109
56	10.2.133.110/31	10.2.133.110 – 10.2.133.111	10.2.133.111
57	10.2.133.112/31	10.2.133.112 – 10.2.133.113	10.2.133.113
58	10.2.133.114/31	10.2.133.114 – 10.2.133.115	10.2.133.115
59	10.2.133.116/31	10.2.133.116 – 10.2.133.117	10.2.133.117
60	10.2.133.118/31	10.2.133.118 – 10.2.133.119	10.2.133.119
61	10.2.133.120/31	10.2.133.120 – 10.2.133.121	10.2.133.121
62	10.2.133.122/31	10.2.133.122 – 10.2.133.123	10.2.133.123
63	10.2.133.124/31	10.2.133.124 – 10.2.133.125	10.2.133.125
64	10.2.133.126/31	10.2.133.126 – 10.2.133.127	10.2.133.127
65	10.2.133.128/31	10.2.133.128 – 10.2.133.129	10.2.133.129
66	10.2.133.130/31	10.2.133.130 – 10.2.133.131	10.2.133.131
67	10.2.133.132/31	10.2.133.132 – 10.2.133.133	10.2.133.133
68	10.2.133.134/31	10.2.133.134 – 10.2.133.135	10.2.133.135
69	10.2.133.136/31	10.2.133.136 – 10.2.133.137	10.2.133.137
70	10.2.133.138/31	10.2.133.138 – 10.2.133.139	10.2.133.139
71	10.2.133.140/31	10.2.133.140 – 10.2.133.141	10.2.133.141
72	10.2.133.142/31	10.2.133.142 – 10.2.133.143	10.2.133.143
73	10.2.133.144/31	10.2.133.144 – 10.2.133.145	10.2.133.145
74	10.2.133.146/31	10.2.133.146 – 10.2.133.147	10.2.133.147
75	10.2.133.148/31	10.2.133.148 – 10.2.133.149	10.2.133.149
76	10.2.133.150/31	10.2.133.150 – 10.2.133.151	10.2.133.151
77	10.2.133.152/31	10.2.133.152 – 10.2.133.153	10.2.133.153
78	10.2.133.154/31	10.2.133.154 – 10.2.133.155	10.2.133.155
79	10.2.133.156/31	10.2.133.156 – 10.2.133.157	10.2.133.157
80	10.2.133.158/31	10.2.133.158 – 10.2.133.159	10.2.133.159
81	10.2.133.160/31	10.2.133.160 – 10.2.133.161	10.2.133.161
82	10.2.133.162/31	10.2.133.162 – 10.2.133.163	10.2.133.163
83	10.2.133.164/31	10.2.133.164 – 10.2.133.165	10.2.133.165
84	10.2.133.166/31	10.2.133.166 – 10.2.133.167	10.2.133.167
85	10.2.133.168/31	10.2.133.168 – 10.2.133.169	10.2.133.169
86	10.2.133.170/31	10.2.133.170 – 10.2.133.171	10.2.133.171
87	10.2.133.172/31	10.2.133.172 – 10.2.133.173	10.2.133.173
88	10.2.133.174/31	10.2.133.174 – 10.2.133.175	10.2.133.175
89	10.2.133.176/31	10.2.133.176 – 10.2.133.177	10.2.133.177
90	10.2.133.178/31	10.2.133.178 – 10.2.133.179	10.2.133.179
91	10.2.133.180/31	10.2.133.180 – 10.2.133.181	10.2.133.181
92	10.2.133.182/31	10.2.133.182 – 10.2.133.183	10.2.133.183
93	10.2.133.184/31	10.2.133.184 – 10.2.133.185	10.2.133.185
94	10.2.133.186/31	10.2.133.186 – 10.2.133.187	10.2.133.187
95	10.2.133.188/31	10.2.133.188 – 10.2.133.189	10.2.133.189
96	10.2.133.190/31	10.2.133.190 – 10.2.133.191	10.2.133.191
97	10.2.133.192/31	10.2.133.192 – 10.2.133.193	10.2.133.193
98	10.2.133.194/31	10.2.133.194 – 10.2.133.195	10.2.133.195
99	10.2.133.196/31	10.2.133.196 – 10.2.133.197	10.2.133.197
100	10.2.133.198/31	10.2.133.198 – 10.2.133.199	10.2.133.199
101	10.2.133.200/31	10.2.133.200 – 10.2.133.201	10.2.133.201
102	10.2.133.202/31	10.2.133.202 – 10.2.133.203	10.2.133.203
103	10.2.133.204/31	10.2.133.204 – 10.2.133.205	10.2.133.205
104	10.2.133.206/31	10.2.133.206 – 10.2.133.207	10.2.133.207
105	10.2.133.208/31	10.2.133.208 – 10.2.133.209	10.2.133.209
106	10.2.133.210/31	10.2.133.210 – 10.2.133.211	10.2.133.211
107	10.2.133.212/31	10.2.133.212 – 10.2.133.213	10.2.133.213
108	10.2.133.214/31	10.2.133.214 – 10.2.133.215	10.2.133.215
109	10.2.133.216/31	10.2.133.216 – 10.2.133.217	10.2.133.217
110	10.2.133.218/31	10.2.133.218 – 10.2.133.219	10.2.133.219
111	10.2.133.220/31	10.2.133.220 – 10.2.133.221	10.2.133.221
112	10.2.133.222/31	10.2.133.222 – 10.2.133.223	10.2.133.223
113	10.2.133.224/31	10.2.133.224 – 10.2.133.225	10.2.133.225
114	10.2.133.226/31	10.2.133.226 – 10.2.133.227	10.2.133.227
115	10.2.133.228/31	10.2.133.228 – 10.2.133.229	10.2.133.229
116	10.2.133.230/31	10.2.133.230 – 10.2.133.231	10.2.133.231
117	10.2.133.232/31	10.2.133.232 – 10.2.133.233	10.2.133.233
118	10.2.133.234/31	10.2.133.234 – 10.2.133.235	10.2.133.235
119	10.2.133.236/31	10.2.133.236 – 10.2.133.237	10.2.133.237
120	10.2.133.238/31	10.2.133.238 – 10.2.133.239	10.2.133.239
121	10.2.133.240/31	10.2.133.240 – 10.2.133.241	10.2.133.241
122	10.2.133.242/31	10.2.133.242 – 10.2.133.243	10.2.133.243
123	10.2.133.244/31	10.2.133.244 – 10.2.133.245	10.2.133.245
124	10.2.133.246/31	10.2.133.246 – 10.2.133.247	10.2.133.247
125	10.2.133.248/31	10.2.133.248 – 10.2.133.249	10.2.133.249
126	10.2.133.250/31	10.2.133.250 – 10.2.133.251	10.2.133.251
127	10.2.133.252/31	10.2.133.252 – 10.2.133.253	10.2.133.253
128	10.2.133.254/31	10.2.133.254 – 10.2.133.255	10.2.133.255

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 →