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)192.168.1.10/24

network192.168.1.0/24

broadcast192.168.1.255

first host192.168.1.1

last host192.168.1.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classC

ipcalc 192.168.1.10/24

address11000000.10101000.00000001.00001010

subnet mask11111111.11111111.11111111.00000000

network11000000.10101000.00000001.00000000

broadcast11000000.10101000.00000001.11111111

green = network part, grey = host part

hex0xc0a8010a

decimal3232235786

reverse dns10.1.168.192.in-addr.arpa

ipv4-mapped::ffff:c0a8:10a

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	192.168.1.0/31	192.168.1.0 – 192.168.1.1	192.168.1.1
2	192.168.1.2/31	192.168.1.2 – 192.168.1.3	192.168.1.3
3	192.168.1.4/31	192.168.1.4 – 192.168.1.5	192.168.1.5
4	192.168.1.6/31	192.168.1.6 – 192.168.1.7	192.168.1.7
5	192.168.1.8/31	192.168.1.8 – 192.168.1.9	192.168.1.9
6	192.168.1.10/31	192.168.1.10 – 192.168.1.11	192.168.1.11
7	192.168.1.12/31	192.168.1.12 – 192.168.1.13	192.168.1.13
8	192.168.1.14/31	192.168.1.14 – 192.168.1.15	192.168.1.15
9	192.168.1.16/31	192.168.1.16 – 192.168.1.17	192.168.1.17
10	192.168.1.18/31	192.168.1.18 – 192.168.1.19	192.168.1.19
11	192.168.1.20/31	192.168.1.20 – 192.168.1.21	192.168.1.21
12	192.168.1.22/31	192.168.1.22 – 192.168.1.23	192.168.1.23
13	192.168.1.24/31	192.168.1.24 – 192.168.1.25	192.168.1.25
14	192.168.1.26/31	192.168.1.26 – 192.168.1.27	192.168.1.27
15	192.168.1.28/31	192.168.1.28 – 192.168.1.29	192.168.1.29
16	192.168.1.30/31	192.168.1.30 – 192.168.1.31	192.168.1.31
17	192.168.1.32/31	192.168.1.32 – 192.168.1.33	192.168.1.33
18	192.168.1.34/31	192.168.1.34 – 192.168.1.35	192.168.1.35
19	192.168.1.36/31	192.168.1.36 – 192.168.1.37	192.168.1.37
20	192.168.1.38/31	192.168.1.38 – 192.168.1.39	192.168.1.39
21	192.168.1.40/31	192.168.1.40 – 192.168.1.41	192.168.1.41
22	192.168.1.42/31	192.168.1.42 – 192.168.1.43	192.168.1.43
23	192.168.1.44/31	192.168.1.44 – 192.168.1.45	192.168.1.45
24	192.168.1.46/31	192.168.1.46 – 192.168.1.47	192.168.1.47
25	192.168.1.48/31	192.168.1.48 – 192.168.1.49	192.168.1.49
26	192.168.1.50/31	192.168.1.50 – 192.168.1.51	192.168.1.51
27	192.168.1.52/31	192.168.1.52 – 192.168.1.53	192.168.1.53
28	192.168.1.54/31	192.168.1.54 – 192.168.1.55	192.168.1.55
29	192.168.1.56/31	192.168.1.56 – 192.168.1.57	192.168.1.57
30	192.168.1.58/31	192.168.1.58 – 192.168.1.59	192.168.1.59
31	192.168.1.60/31	192.168.1.60 – 192.168.1.61	192.168.1.61
32	192.168.1.62/31	192.168.1.62 – 192.168.1.63	192.168.1.63
33	192.168.1.64/31	192.168.1.64 – 192.168.1.65	192.168.1.65
34	192.168.1.66/31	192.168.1.66 – 192.168.1.67	192.168.1.67
35	192.168.1.68/31	192.168.1.68 – 192.168.1.69	192.168.1.69
36	192.168.1.70/31	192.168.1.70 – 192.168.1.71	192.168.1.71
37	192.168.1.72/31	192.168.1.72 – 192.168.1.73	192.168.1.73
38	192.168.1.74/31	192.168.1.74 – 192.168.1.75	192.168.1.75
39	192.168.1.76/31	192.168.1.76 – 192.168.1.77	192.168.1.77
40	192.168.1.78/31	192.168.1.78 – 192.168.1.79	192.168.1.79
41	192.168.1.80/31	192.168.1.80 – 192.168.1.81	192.168.1.81
42	192.168.1.82/31	192.168.1.82 – 192.168.1.83	192.168.1.83
43	192.168.1.84/31	192.168.1.84 – 192.168.1.85	192.168.1.85
44	192.168.1.86/31	192.168.1.86 – 192.168.1.87	192.168.1.87
45	192.168.1.88/31	192.168.1.88 – 192.168.1.89	192.168.1.89
46	192.168.1.90/31	192.168.1.90 – 192.168.1.91	192.168.1.91
47	192.168.1.92/31	192.168.1.92 – 192.168.1.93	192.168.1.93
48	192.168.1.94/31	192.168.1.94 – 192.168.1.95	192.168.1.95
49	192.168.1.96/31	192.168.1.96 – 192.168.1.97	192.168.1.97
50	192.168.1.98/31	192.168.1.98 – 192.168.1.99	192.168.1.99
51	192.168.1.100/31	192.168.1.100 – 192.168.1.101	192.168.1.101
52	192.168.1.102/31	192.168.1.102 – 192.168.1.103	192.168.1.103
53	192.168.1.104/31	192.168.1.104 – 192.168.1.105	192.168.1.105
54	192.168.1.106/31	192.168.1.106 – 192.168.1.107	192.168.1.107
55	192.168.1.108/31	192.168.1.108 – 192.168.1.109	192.168.1.109
56	192.168.1.110/31	192.168.1.110 – 192.168.1.111	192.168.1.111
57	192.168.1.112/31	192.168.1.112 – 192.168.1.113	192.168.1.113
58	192.168.1.114/31	192.168.1.114 – 192.168.1.115	192.168.1.115
59	192.168.1.116/31	192.168.1.116 – 192.168.1.117	192.168.1.117
60	192.168.1.118/31	192.168.1.118 – 192.168.1.119	192.168.1.119
61	192.168.1.120/31	192.168.1.120 – 192.168.1.121	192.168.1.121
62	192.168.1.122/31	192.168.1.122 – 192.168.1.123	192.168.1.123
63	192.168.1.124/31	192.168.1.124 – 192.168.1.125	192.168.1.125
64	192.168.1.126/31	192.168.1.126 – 192.168.1.127	192.168.1.127
65	192.168.1.128/31	192.168.1.128 – 192.168.1.129	192.168.1.129
66	192.168.1.130/31	192.168.1.130 – 192.168.1.131	192.168.1.131
67	192.168.1.132/31	192.168.1.132 – 192.168.1.133	192.168.1.133
68	192.168.1.134/31	192.168.1.134 – 192.168.1.135	192.168.1.135
69	192.168.1.136/31	192.168.1.136 – 192.168.1.137	192.168.1.137
70	192.168.1.138/31	192.168.1.138 – 192.168.1.139	192.168.1.139
71	192.168.1.140/31	192.168.1.140 – 192.168.1.141	192.168.1.141
72	192.168.1.142/31	192.168.1.142 – 192.168.1.143	192.168.1.143
73	192.168.1.144/31	192.168.1.144 – 192.168.1.145	192.168.1.145
74	192.168.1.146/31	192.168.1.146 – 192.168.1.147	192.168.1.147
75	192.168.1.148/31	192.168.1.148 – 192.168.1.149	192.168.1.149
76	192.168.1.150/31	192.168.1.150 – 192.168.1.151	192.168.1.151
77	192.168.1.152/31	192.168.1.152 – 192.168.1.153	192.168.1.153
78	192.168.1.154/31	192.168.1.154 – 192.168.1.155	192.168.1.155
79	192.168.1.156/31	192.168.1.156 – 192.168.1.157	192.168.1.157
80	192.168.1.158/31	192.168.1.158 – 192.168.1.159	192.168.1.159
81	192.168.1.160/31	192.168.1.160 – 192.168.1.161	192.168.1.161
82	192.168.1.162/31	192.168.1.162 – 192.168.1.163	192.168.1.163
83	192.168.1.164/31	192.168.1.164 – 192.168.1.165	192.168.1.165
84	192.168.1.166/31	192.168.1.166 – 192.168.1.167	192.168.1.167
85	192.168.1.168/31	192.168.1.168 – 192.168.1.169	192.168.1.169
86	192.168.1.170/31	192.168.1.170 – 192.168.1.171	192.168.1.171
87	192.168.1.172/31	192.168.1.172 – 192.168.1.173	192.168.1.173
88	192.168.1.174/31	192.168.1.174 – 192.168.1.175	192.168.1.175
89	192.168.1.176/31	192.168.1.176 – 192.168.1.177	192.168.1.177
90	192.168.1.178/31	192.168.1.178 – 192.168.1.179	192.168.1.179
91	192.168.1.180/31	192.168.1.180 – 192.168.1.181	192.168.1.181
92	192.168.1.182/31	192.168.1.182 – 192.168.1.183	192.168.1.183
93	192.168.1.184/31	192.168.1.184 – 192.168.1.185	192.168.1.185
94	192.168.1.186/31	192.168.1.186 – 192.168.1.187	192.168.1.187
95	192.168.1.188/31	192.168.1.188 – 192.168.1.189	192.168.1.189
96	192.168.1.190/31	192.168.1.190 – 192.168.1.191	192.168.1.191
97	192.168.1.192/31	192.168.1.192 – 192.168.1.193	192.168.1.193
98	192.168.1.194/31	192.168.1.194 – 192.168.1.195	192.168.1.195
99	192.168.1.196/31	192.168.1.196 – 192.168.1.197	192.168.1.197
100	192.168.1.198/31	192.168.1.198 – 192.168.1.199	192.168.1.199
101	192.168.1.200/31	192.168.1.200 – 192.168.1.201	192.168.1.201
102	192.168.1.202/31	192.168.1.202 – 192.168.1.203	192.168.1.203
103	192.168.1.204/31	192.168.1.204 – 192.168.1.205	192.168.1.205
104	192.168.1.206/31	192.168.1.206 – 192.168.1.207	192.168.1.207
105	192.168.1.208/31	192.168.1.208 – 192.168.1.209	192.168.1.209
106	192.168.1.210/31	192.168.1.210 – 192.168.1.211	192.168.1.211
107	192.168.1.212/31	192.168.1.212 – 192.168.1.213	192.168.1.213
108	192.168.1.214/31	192.168.1.214 – 192.168.1.215	192.168.1.215
109	192.168.1.216/31	192.168.1.216 – 192.168.1.217	192.168.1.217
110	192.168.1.218/31	192.168.1.218 – 192.168.1.219	192.168.1.219
111	192.168.1.220/31	192.168.1.220 – 192.168.1.221	192.168.1.221
112	192.168.1.222/31	192.168.1.222 – 192.168.1.223	192.168.1.223
113	192.168.1.224/31	192.168.1.224 – 192.168.1.225	192.168.1.225
114	192.168.1.226/31	192.168.1.226 – 192.168.1.227	192.168.1.227
115	192.168.1.228/31	192.168.1.228 – 192.168.1.229	192.168.1.229
116	192.168.1.230/31	192.168.1.230 – 192.168.1.231	192.168.1.231
117	192.168.1.232/31	192.168.1.232 – 192.168.1.233	192.168.1.233
118	192.168.1.234/31	192.168.1.234 – 192.168.1.235	192.168.1.235
119	192.168.1.236/31	192.168.1.236 – 192.168.1.237	192.168.1.237
120	192.168.1.238/31	192.168.1.238 – 192.168.1.239	192.168.1.239
121	192.168.1.240/31	192.168.1.240 – 192.168.1.241	192.168.1.241
122	192.168.1.242/31	192.168.1.242 – 192.168.1.243	192.168.1.243
123	192.168.1.244/31	192.168.1.244 – 192.168.1.245	192.168.1.245
124	192.168.1.246/31	192.168.1.246 – 192.168.1.247	192.168.1.247
125	192.168.1.248/31	192.168.1.248 – 192.168.1.249	192.168.1.249
126	192.168.1.250/31	192.168.1.250 – 192.168.1.251	192.168.1.251
127	192.168.1.252/31	192.168.1.252 – 192.168.1.253	192.168.1.253
128	192.168.1.254/31	192.168.1.254 – 192.168.1.255	192.168.1.255

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 →