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)10.167.51.0/24

network10.167.51.0/24

broadcast10.167.51.255

first host10.167.51.1

last host10.167.51.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.167.51.0/24

address00001010.10100111.00110011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10100111.00110011.00000000

broadcast00001010.10100111.00110011.11111111

green = network part, grey = host part

hex0x0aa73300

decimal178729728

reverse dns0.51.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:3300

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.51.0/31	10.167.51.0 – 10.167.51.1	10.167.51.1
2	10.167.51.2/31	10.167.51.2 – 10.167.51.3	10.167.51.3
3	10.167.51.4/31	10.167.51.4 – 10.167.51.5	10.167.51.5
4	10.167.51.6/31	10.167.51.6 – 10.167.51.7	10.167.51.7
5	10.167.51.8/31	10.167.51.8 – 10.167.51.9	10.167.51.9
6	10.167.51.10/31	10.167.51.10 – 10.167.51.11	10.167.51.11
7	10.167.51.12/31	10.167.51.12 – 10.167.51.13	10.167.51.13
8	10.167.51.14/31	10.167.51.14 – 10.167.51.15	10.167.51.15
9	10.167.51.16/31	10.167.51.16 – 10.167.51.17	10.167.51.17
10	10.167.51.18/31	10.167.51.18 – 10.167.51.19	10.167.51.19
11	10.167.51.20/31	10.167.51.20 – 10.167.51.21	10.167.51.21
12	10.167.51.22/31	10.167.51.22 – 10.167.51.23	10.167.51.23
13	10.167.51.24/31	10.167.51.24 – 10.167.51.25	10.167.51.25
14	10.167.51.26/31	10.167.51.26 – 10.167.51.27	10.167.51.27
15	10.167.51.28/31	10.167.51.28 – 10.167.51.29	10.167.51.29
16	10.167.51.30/31	10.167.51.30 – 10.167.51.31	10.167.51.31
17	10.167.51.32/31	10.167.51.32 – 10.167.51.33	10.167.51.33
18	10.167.51.34/31	10.167.51.34 – 10.167.51.35	10.167.51.35
19	10.167.51.36/31	10.167.51.36 – 10.167.51.37	10.167.51.37
20	10.167.51.38/31	10.167.51.38 – 10.167.51.39	10.167.51.39
21	10.167.51.40/31	10.167.51.40 – 10.167.51.41	10.167.51.41
22	10.167.51.42/31	10.167.51.42 – 10.167.51.43	10.167.51.43
23	10.167.51.44/31	10.167.51.44 – 10.167.51.45	10.167.51.45
24	10.167.51.46/31	10.167.51.46 – 10.167.51.47	10.167.51.47
25	10.167.51.48/31	10.167.51.48 – 10.167.51.49	10.167.51.49
26	10.167.51.50/31	10.167.51.50 – 10.167.51.51	10.167.51.51
27	10.167.51.52/31	10.167.51.52 – 10.167.51.53	10.167.51.53
28	10.167.51.54/31	10.167.51.54 – 10.167.51.55	10.167.51.55
29	10.167.51.56/31	10.167.51.56 – 10.167.51.57	10.167.51.57
30	10.167.51.58/31	10.167.51.58 – 10.167.51.59	10.167.51.59
31	10.167.51.60/31	10.167.51.60 – 10.167.51.61	10.167.51.61
32	10.167.51.62/31	10.167.51.62 – 10.167.51.63	10.167.51.63
33	10.167.51.64/31	10.167.51.64 – 10.167.51.65	10.167.51.65
34	10.167.51.66/31	10.167.51.66 – 10.167.51.67	10.167.51.67
35	10.167.51.68/31	10.167.51.68 – 10.167.51.69	10.167.51.69
36	10.167.51.70/31	10.167.51.70 – 10.167.51.71	10.167.51.71
37	10.167.51.72/31	10.167.51.72 – 10.167.51.73	10.167.51.73
38	10.167.51.74/31	10.167.51.74 – 10.167.51.75	10.167.51.75
39	10.167.51.76/31	10.167.51.76 – 10.167.51.77	10.167.51.77
40	10.167.51.78/31	10.167.51.78 – 10.167.51.79	10.167.51.79
41	10.167.51.80/31	10.167.51.80 – 10.167.51.81	10.167.51.81
42	10.167.51.82/31	10.167.51.82 – 10.167.51.83	10.167.51.83
43	10.167.51.84/31	10.167.51.84 – 10.167.51.85	10.167.51.85
44	10.167.51.86/31	10.167.51.86 – 10.167.51.87	10.167.51.87
45	10.167.51.88/31	10.167.51.88 – 10.167.51.89	10.167.51.89
46	10.167.51.90/31	10.167.51.90 – 10.167.51.91	10.167.51.91
47	10.167.51.92/31	10.167.51.92 – 10.167.51.93	10.167.51.93
48	10.167.51.94/31	10.167.51.94 – 10.167.51.95	10.167.51.95
49	10.167.51.96/31	10.167.51.96 – 10.167.51.97	10.167.51.97
50	10.167.51.98/31	10.167.51.98 – 10.167.51.99	10.167.51.99
51	10.167.51.100/31	10.167.51.100 – 10.167.51.101	10.167.51.101
52	10.167.51.102/31	10.167.51.102 – 10.167.51.103	10.167.51.103
53	10.167.51.104/31	10.167.51.104 – 10.167.51.105	10.167.51.105
54	10.167.51.106/31	10.167.51.106 – 10.167.51.107	10.167.51.107
55	10.167.51.108/31	10.167.51.108 – 10.167.51.109	10.167.51.109
56	10.167.51.110/31	10.167.51.110 – 10.167.51.111	10.167.51.111
57	10.167.51.112/31	10.167.51.112 – 10.167.51.113	10.167.51.113
58	10.167.51.114/31	10.167.51.114 – 10.167.51.115	10.167.51.115
59	10.167.51.116/31	10.167.51.116 – 10.167.51.117	10.167.51.117
60	10.167.51.118/31	10.167.51.118 – 10.167.51.119	10.167.51.119
61	10.167.51.120/31	10.167.51.120 – 10.167.51.121	10.167.51.121
62	10.167.51.122/31	10.167.51.122 – 10.167.51.123	10.167.51.123
63	10.167.51.124/31	10.167.51.124 – 10.167.51.125	10.167.51.125
64	10.167.51.126/31	10.167.51.126 – 10.167.51.127	10.167.51.127
65	10.167.51.128/31	10.167.51.128 – 10.167.51.129	10.167.51.129
66	10.167.51.130/31	10.167.51.130 – 10.167.51.131	10.167.51.131
67	10.167.51.132/31	10.167.51.132 – 10.167.51.133	10.167.51.133
68	10.167.51.134/31	10.167.51.134 – 10.167.51.135	10.167.51.135
69	10.167.51.136/31	10.167.51.136 – 10.167.51.137	10.167.51.137
70	10.167.51.138/31	10.167.51.138 – 10.167.51.139	10.167.51.139
71	10.167.51.140/31	10.167.51.140 – 10.167.51.141	10.167.51.141
72	10.167.51.142/31	10.167.51.142 – 10.167.51.143	10.167.51.143
73	10.167.51.144/31	10.167.51.144 – 10.167.51.145	10.167.51.145
74	10.167.51.146/31	10.167.51.146 – 10.167.51.147	10.167.51.147
75	10.167.51.148/31	10.167.51.148 – 10.167.51.149	10.167.51.149
76	10.167.51.150/31	10.167.51.150 – 10.167.51.151	10.167.51.151
77	10.167.51.152/31	10.167.51.152 – 10.167.51.153	10.167.51.153
78	10.167.51.154/31	10.167.51.154 – 10.167.51.155	10.167.51.155
79	10.167.51.156/31	10.167.51.156 – 10.167.51.157	10.167.51.157
80	10.167.51.158/31	10.167.51.158 – 10.167.51.159	10.167.51.159
81	10.167.51.160/31	10.167.51.160 – 10.167.51.161	10.167.51.161
82	10.167.51.162/31	10.167.51.162 – 10.167.51.163	10.167.51.163
83	10.167.51.164/31	10.167.51.164 – 10.167.51.165	10.167.51.165
84	10.167.51.166/31	10.167.51.166 – 10.167.51.167	10.167.51.167
85	10.167.51.168/31	10.167.51.168 – 10.167.51.169	10.167.51.169
86	10.167.51.170/31	10.167.51.170 – 10.167.51.171	10.167.51.171
87	10.167.51.172/31	10.167.51.172 – 10.167.51.173	10.167.51.173
88	10.167.51.174/31	10.167.51.174 – 10.167.51.175	10.167.51.175
89	10.167.51.176/31	10.167.51.176 – 10.167.51.177	10.167.51.177
90	10.167.51.178/31	10.167.51.178 – 10.167.51.179	10.167.51.179
91	10.167.51.180/31	10.167.51.180 – 10.167.51.181	10.167.51.181
92	10.167.51.182/31	10.167.51.182 – 10.167.51.183	10.167.51.183
93	10.167.51.184/31	10.167.51.184 – 10.167.51.185	10.167.51.185
94	10.167.51.186/31	10.167.51.186 – 10.167.51.187	10.167.51.187
95	10.167.51.188/31	10.167.51.188 – 10.167.51.189	10.167.51.189
96	10.167.51.190/31	10.167.51.190 – 10.167.51.191	10.167.51.191
97	10.167.51.192/31	10.167.51.192 – 10.167.51.193	10.167.51.193
98	10.167.51.194/31	10.167.51.194 – 10.167.51.195	10.167.51.195
99	10.167.51.196/31	10.167.51.196 – 10.167.51.197	10.167.51.197
100	10.167.51.198/31	10.167.51.198 – 10.167.51.199	10.167.51.199
101	10.167.51.200/31	10.167.51.200 – 10.167.51.201	10.167.51.201
102	10.167.51.202/31	10.167.51.202 – 10.167.51.203	10.167.51.203
103	10.167.51.204/31	10.167.51.204 – 10.167.51.205	10.167.51.205
104	10.167.51.206/31	10.167.51.206 – 10.167.51.207	10.167.51.207
105	10.167.51.208/31	10.167.51.208 – 10.167.51.209	10.167.51.209
106	10.167.51.210/31	10.167.51.210 – 10.167.51.211	10.167.51.211
107	10.167.51.212/31	10.167.51.212 – 10.167.51.213	10.167.51.213
108	10.167.51.214/31	10.167.51.214 – 10.167.51.215	10.167.51.215
109	10.167.51.216/31	10.167.51.216 – 10.167.51.217	10.167.51.217
110	10.167.51.218/31	10.167.51.218 – 10.167.51.219	10.167.51.219
111	10.167.51.220/31	10.167.51.220 – 10.167.51.221	10.167.51.221
112	10.167.51.222/31	10.167.51.222 – 10.167.51.223	10.167.51.223
113	10.167.51.224/31	10.167.51.224 – 10.167.51.225	10.167.51.225
114	10.167.51.226/31	10.167.51.226 – 10.167.51.227	10.167.51.227
115	10.167.51.228/31	10.167.51.228 – 10.167.51.229	10.167.51.229
116	10.167.51.230/31	10.167.51.230 – 10.167.51.231	10.167.51.231
117	10.167.51.232/31	10.167.51.232 – 10.167.51.233	10.167.51.233
118	10.167.51.234/31	10.167.51.234 – 10.167.51.235	10.167.51.235
119	10.167.51.236/31	10.167.51.236 – 10.167.51.237	10.167.51.237
120	10.167.51.238/31	10.167.51.238 – 10.167.51.239	10.167.51.239
121	10.167.51.240/31	10.167.51.240 – 10.167.51.241	10.167.51.241
122	10.167.51.242/31	10.167.51.242 – 10.167.51.243	10.167.51.243
123	10.167.51.244/31	10.167.51.244 – 10.167.51.245	10.167.51.245
124	10.167.51.246/31	10.167.51.246 – 10.167.51.247	10.167.51.247
125	10.167.51.248/31	10.167.51.248 – 10.167.51.249	10.167.51.249
126	10.167.51.250/31	10.167.51.250 – 10.167.51.251	10.167.51.251
127	10.167.51.252/31	10.167.51.252 – 10.167.51.253	10.167.51.253
128	10.167.51.254/31	10.167.51.254 – 10.167.51.255	10.167.51.255

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 →