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)10.3.112.0/24

network10.3.112.0/24

broadcast10.3.112.255

first host10.3.112.1

last host10.3.112.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.112.0/24

address00001010.00000011.01110000.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.01110000.00000000

broadcast00001010.00000011.01110000.11111111

green = network part, grey = host part

hex0x0a037000

decimal167997440

reverse dns0.112.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:7000

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.112.0/31	10.3.112.0 – 10.3.112.1	10.3.112.1
2	10.3.112.2/31	10.3.112.2 – 10.3.112.3	10.3.112.3
3	10.3.112.4/31	10.3.112.4 – 10.3.112.5	10.3.112.5
4	10.3.112.6/31	10.3.112.6 – 10.3.112.7	10.3.112.7
5	10.3.112.8/31	10.3.112.8 – 10.3.112.9	10.3.112.9
6	10.3.112.10/31	10.3.112.10 – 10.3.112.11	10.3.112.11
7	10.3.112.12/31	10.3.112.12 – 10.3.112.13	10.3.112.13
8	10.3.112.14/31	10.3.112.14 – 10.3.112.15	10.3.112.15
9	10.3.112.16/31	10.3.112.16 – 10.3.112.17	10.3.112.17
10	10.3.112.18/31	10.3.112.18 – 10.3.112.19	10.3.112.19
11	10.3.112.20/31	10.3.112.20 – 10.3.112.21	10.3.112.21
12	10.3.112.22/31	10.3.112.22 – 10.3.112.23	10.3.112.23
13	10.3.112.24/31	10.3.112.24 – 10.3.112.25	10.3.112.25
14	10.3.112.26/31	10.3.112.26 – 10.3.112.27	10.3.112.27
15	10.3.112.28/31	10.3.112.28 – 10.3.112.29	10.3.112.29
16	10.3.112.30/31	10.3.112.30 – 10.3.112.31	10.3.112.31
17	10.3.112.32/31	10.3.112.32 – 10.3.112.33	10.3.112.33
18	10.3.112.34/31	10.3.112.34 – 10.3.112.35	10.3.112.35
19	10.3.112.36/31	10.3.112.36 – 10.3.112.37	10.3.112.37
20	10.3.112.38/31	10.3.112.38 – 10.3.112.39	10.3.112.39
21	10.3.112.40/31	10.3.112.40 – 10.3.112.41	10.3.112.41
22	10.3.112.42/31	10.3.112.42 – 10.3.112.43	10.3.112.43
23	10.3.112.44/31	10.3.112.44 – 10.3.112.45	10.3.112.45
24	10.3.112.46/31	10.3.112.46 – 10.3.112.47	10.3.112.47
25	10.3.112.48/31	10.3.112.48 – 10.3.112.49	10.3.112.49
26	10.3.112.50/31	10.3.112.50 – 10.3.112.51	10.3.112.51
27	10.3.112.52/31	10.3.112.52 – 10.3.112.53	10.3.112.53
28	10.3.112.54/31	10.3.112.54 – 10.3.112.55	10.3.112.55
29	10.3.112.56/31	10.3.112.56 – 10.3.112.57	10.3.112.57
30	10.3.112.58/31	10.3.112.58 – 10.3.112.59	10.3.112.59
31	10.3.112.60/31	10.3.112.60 – 10.3.112.61	10.3.112.61
32	10.3.112.62/31	10.3.112.62 – 10.3.112.63	10.3.112.63
33	10.3.112.64/31	10.3.112.64 – 10.3.112.65	10.3.112.65
34	10.3.112.66/31	10.3.112.66 – 10.3.112.67	10.3.112.67
35	10.3.112.68/31	10.3.112.68 – 10.3.112.69	10.3.112.69
36	10.3.112.70/31	10.3.112.70 – 10.3.112.71	10.3.112.71
37	10.3.112.72/31	10.3.112.72 – 10.3.112.73	10.3.112.73
38	10.3.112.74/31	10.3.112.74 – 10.3.112.75	10.3.112.75
39	10.3.112.76/31	10.3.112.76 – 10.3.112.77	10.3.112.77
40	10.3.112.78/31	10.3.112.78 – 10.3.112.79	10.3.112.79
41	10.3.112.80/31	10.3.112.80 – 10.3.112.81	10.3.112.81
42	10.3.112.82/31	10.3.112.82 – 10.3.112.83	10.3.112.83
43	10.3.112.84/31	10.3.112.84 – 10.3.112.85	10.3.112.85
44	10.3.112.86/31	10.3.112.86 – 10.3.112.87	10.3.112.87
45	10.3.112.88/31	10.3.112.88 – 10.3.112.89	10.3.112.89
46	10.3.112.90/31	10.3.112.90 – 10.3.112.91	10.3.112.91
47	10.3.112.92/31	10.3.112.92 – 10.3.112.93	10.3.112.93
48	10.3.112.94/31	10.3.112.94 – 10.3.112.95	10.3.112.95
49	10.3.112.96/31	10.3.112.96 – 10.3.112.97	10.3.112.97
50	10.3.112.98/31	10.3.112.98 – 10.3.112.99	10.3.112.99
51	10.3.112.100/31	10.3.112.100 – 10.3.112.101	10.3.112.101
52	10.3.112.102/31	10.3.112.102 – 10.3.112.103	10.3.112.103
53	10.3.112.104/31	10.3.112.104 – 10.3.112.105	10.3.112.105
54	10.3.112.106/31	10.3.112.106 – 10.3.112.107	10.3.112.107
55	10.3.112.108/31	10.3.112.108 – 10.3.112.109	10.3.112.109
56	10.3.112.110/31	10.3.112.110 – 10.3.112.111	10.3.112.111
57	10.3.112.112/31	10.3.112.112 – 10.3.112.113	10.3.112.113
58	10.3.112.114/31	10.3.112.114 – 10.3.112.115	10.3.112.115
59	10.3.112.116/31	10.3.112.116 – 10.3.112.117	10.3.112.117
60	10.3.112.118/31	10.3.112.118 – 10.3.112.119	10.3.112.119
61	10.3.112.120/31	10.3.112.120 – 10.3.112.121	10.3.112.121
62	10.3.112.122/31	10.3.112.122 – 10.3.112.123	10.3.112.123
63	10.3.112.124/31	10.3.112.124 – 10.3.112.125	10.3.112.125
64	10.3.112.126/31	10.3.112.126 – 10.3.112.127	10.3.112.127
65	10.3.112.128/31	10.3.112.128 – 10.3.112.129	10.3.112.129
66	10.3.112.130/31	10.3.112.130 – 10.3.112.131	10.3.112.131
67	10.3.112.132/31	10.3.112.132 – 10.3.112.133	10.3.112.133
68	10.3.112.134/31	10.3.112.134 – 10.3.112.135	10.3.112.135
69	10.3.112.136/31	10.3.112.136 – 10.3.112.137	10.3.112.137
70	10.3.112.138/31	10.3.112.138 – 10.3.112.139	10.3.112.139
71	10.3.112.140/31	10.3.112.140 – 10.3.112.141	10.3.112.141
72	10.3.112.142/31	10.3.112.142 – 10.3.112.143	10.3.112.143
73	10.3.112.144/31	10.3.112.144 – 10.3.112.145	10.3.112.145
74	10.3.112.146/31	10.3.112.146 – 10.3.112.147	10.3.112.147
75	10.3.112.148/31	10.3.112.148 – 10.3.112.149	10.3.112.149
76	10.3.112.150/31	10.3.112.150 – 10.3.112.151	10.3.112.151
77	10.3.112.152/31	10.3.112.152 – 10.3.112.153	10.3.112.153
78	10.3.112.154/31	10.3.112.154 – 10.3.112.155	10.3.112.155
79	10.3.112.156/31	10.3.112.156 – 10.3.112.157	10.3.112.157
80	10.3.112.158/31	10.3.112.158 – 10.3.112.159	10.3.112.159
81	10.3.112.160/31	10.3.112.160 – 10.3.112.161	10.3.112.161
82	10.3.112.162/31	10.3.112.162 – 10.3.112.163	10.3.112.163
83	10.3.112.164/31	10.3.112.164 – 10.3.112.165	10.3.112.165
84	10.3.112.166/31	10.3.112.166 – 10.3.112.167	10.3.112.167
85	10.3.112.168/31	10.3.112.168 – 10.3.112.169	10.3.112.169
86	10.3.112.170/31	10.3.112.170 – 10.3.112.171	10.3.112.171
87	10.3.112.172/31	10.3.112.172 – 10.3.112.173	10.3.112.173
88	10.3.112.174/31	10.3.112.174 – 10.3.112.175	10.3.112.175
89	10.3.112.176/31	10.3.112.176 – 10.3.112.177	10.3.112.177
90	10.3.112.178/31	10.3.112.178 – 10.3.112.179	10.3.112.179
91	10.3.112.180/31	10.3.112.180 – 10.3.112.181	10.3.112.181
92	10.3.112.182/31	10.3.112.182 – 10.3.112.183	10.3.112.183
93	10.3.112.184/31	10.3.112.184 – 10.3.112.185	10.3.112.185
94	10.3.112.186/31	10.3.112.186 – 10.3.112.187	10.3.112.187
95	10.3.112.188/31	10.3.112.188 – 10.3.112.189	10.3.112.189
96	10.3.112.190/31	10.3.112.190 – 10.3.112.191	10.3.112.191
97	10.3.112.192/31	10.3.112.192 – 10.3.112.193	10.3.112.193
98	10.3.112.194/31	10.3.112.194 – 10.3.112.195	10.3.112.195
99	10.3.112.196/31	10.3.112.196 – 10.3.112.197	10.3.112.197
100	10.3.112.198/31	10.3.112.198 – 10.3.112.199	10.3.112.199
101	10.3.112.200/31	10.3.112.200 – 10.3.112.201	10.3.112.201
102	10.3.112.202/31	10.3.112.202 – 10.3.112.203	10.3.112.203
103	10.3.112.204/31	10.3.112.204 – 10.3.112.205	10.3.112.205
104	10.3.112.206/31	10.3.112.206 – 10.3.112.207	10.3.112.207
105	10.3.112.208/31	10.3.112.208 – 10.3.112.209	10.3.112.209
106	10.3.112.210/31	10.3.112.210 – 10.3.112.211	10.3.112.211
107	10.3.112.212/31	10.3.112.212 – 10.3.112.213	10.3.112.213
108	10.3.112.214/31	10.3.112.214 – 10.3.112.215	10.3.112.215
109	10.3.112.216/31	10.3.112.216 – 10.3.112.217	10.3.112.217
110	10.3.112.218/31	10.3.112.218 – 10.3.112.219	10.3.112.219
111	10.3.112.220/31	10.3.112.220 – 10.3.112.221	10.3.112.221
112	10.3.112.222/31	10.3.112.222 – 10.3.112.223	10.3.112.223
113	10.3.112.224/31	10.3.112.224 – 10.3.112.225	10.3.112.225
114	10.3.112.226/31	10.3.112.226 – 10.3.112.227	10.3.112.227
115	10.3.112.228/31	10.3.112.228 – 10.3.112.229	10.3.112.229
116	10.3.112.230/31	10.3.112.230 – 10.3.112.231	10.3.112.231
117	10.3.112.232/31	10.3.112.232 – 10.3.112.233	10.3.112.233
118	10.3.112.234/31	10.3.112.234 – 10.3.112.235	10.3.112.235
119	10.3.112.236/31	10.3.112.236 – 10.3.112.237	10.3.112.237
120	10.3.112.238/31	10.3.112.238 – 10.3.112.239	10.3.112.239
121	10.3.112.240/31	10.3.112.240 – 10.3.112.241	10.3.112.241
122	10.3.112.242/31	10.3.112.242 – 10.3.112.243	10.3.112.243
123	10.3.112.244/31	10.3.112.244 – 10.3.112.245	10.3.112.245
124	10.3.112.246/31	10.3.112.246 – 10.3.112.247	10.3.112.247
125	10.3.112.248/31	10.3.112.248 – 10.3.112.249	10.3.112.249
126	10.3.112.250/31	10.3.112.250 – 10.3.112.251	10.3.112.251
127	10.3.112.252/31	10.3.112.252 – 10.3.112.253	10.3.112.253
128	10.3.112.254/31	10.3.112.254 – 10.3.112.255	10.3.112.255

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 →