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)10.167.208.0/24

network10.167.208.0/24

broadcast10.167.208.255

first host10.167.208.1

last host10.167.208.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.167.208.0/24

address00001010.10100111.11010000.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10100111.11010000.00000000

broadcast00001010.10100111.11010000.11111111

green = network part, grey = host part

hex0x0aa7d000

decimal178769920

reverse dns0.208.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:d000

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.208.0/31	10.167.208.0 – 10.167.208.1	10.167.208.1
2	10.167.208.2/31	10.167.208.2 – 10.167.208.3	10.167.208.3
3	10.167.208.4/31	10.167.208.4 – 10.167.208.5	10.167.208.5
4	10.167.208.6/31	10.167.208.6 – 10.167.208.7	10.167.208.7
5	10.167.208.8/31	10.167.208.8 – 10.167.208.9	10.167.208.9
6	10.167.208.10/31	10.167.208.10 – 10.167.208.11	10.167.208.11
7	10.167.208.12/31	10.167.208.12 – 10.167.208.13	10.167.208.13
8	10.167.208.14/31	10.167.208.14 – 10.167.208.15	10.167.208.15
9	10.167.208.16/31	10.167.208.16 – 10.167.208.17	10.167.208.17
10	10.167.208.18/31	10.167.208.18 – 10.167.208.19	10.167.208.19
11	10.167.208.20/31	10.167.208.20 – 10.167.208.21	10.167.208.21
12	10.167.208.22/31	10.167.208.22 – 10.167.208.23	10.167.208.23
13	10.167.208.24/31	10.167.208.24 – 10.167.208.25	10.167.208.25
14	10.167.208.26/31	10.167.208.26 – 10.167.208.27	10.167.208.27
15	10.167.208.28/31	10.167.208.28 – 10.167.208.29	10.167.208.29
16	10.167.208.30/31	10.167.208.30 – 10.167.208.31	10.167.208.31
17	10.167.208.32/31	10.167.208.32 – 10.167.208.33	10.167.208.33
18	10.167.208.34/31	10.167.208.34 – 10.167.208.35	10.167.208.35
19	10.167.208.36/31	10.167.208.36 – 10.167.208.37	10.167.208.37
20	10.167.208.38/31	10.167.208.38 – 10.167.208.39	10.167.208.39
21	10.167.208.40/31	10.167.208.40 – 10.167.208.41	10.167.208.41
22	10.167.208.42/31	10.167.208.42 – 10.167.208.43	10.167.208.43
23	10.167.208.44/31	10.167.208.44 – 10.167.208.45	10.167.208.45
24	10.167.208.46/31	10.167.208.46 – 10.167.208.47	10.167.208.47
25	10.167.208.48/31	10.167.208.48 – 10.167.208.49	10.167.208.49
26	10.167.208.50/31	10.167.208.50 – 10.167.208.51	10.167.208.51
27	10.167.208.52/31	10.167.208.52 – 10.167.208.53	10.167.208.53
28	10.167.208.54/31	10.167.208.54 – 10.167.208.55	10.167.208.55
29	10.167.208.56/31	10.167.208.56 – 10.167.208.57	10.167.208.57
30	10.167.208.58/31	10.167.208.58 – 10.167.208.59	10.167.208.59
31	10.167.208.60/31	10.167.208.60 – 10.167.208.61	10.167.208.61
32	10.167.208.62/31	10.167.208.62 – 10.167.208.63	10.167.208.63
33	10.167.208.64/31	10.167.208.64 – 10.167.208.65	10.167.208.65
34	10.167.208.66/31	10.167.208.66 – 10.167.208.67	10.167.208.67
35	10.167.208.68/31	10.167.208.68 – 10.167.208.69	10.167.208.69
36	10.167.208.70/31	10.167.208.70 – 10.167.208.71	10.167.208.71
37	10.167.208.72/31	10.167.208.72 – 10.167.208.73	10.167.208.73
38	10.167.208.74/31	10.167.208.74 – 10.167.208.75	10.167.208.75
39	10.167.208.76/31	10.167.208.76 – 10.167.208.77	10.167.208.77
40	10.167.208.78/31	10.167.208.78 – 10.167.208.79	10.167.208.79
41	10.167.208.80/31	10.167.208.80 – 10.167.208.81	10.167.208.81
42	10.167.208.82/31	10.167.208.82 – 10.167.208.83	10.167.208.83
43	10.167.208.84/31	10.167.208.84 – 10.167.208.85	10.167.208.85
44	10.167.208.86/31	10.167.208.86 – 10.167.208.87	10.167.208.87
45	10.167.208.88/31	10.167.208.88 – 10.167.208.89	10.167.208.89
46	10.167.208.90/31	10.167.208.90 – 10.167.208.91	10.167.208.91
47	10.167.208.92/31	10.167.208.92 – 10.167.208.93	10.167.208.93
48	10.167.208.94/31	10.167.208.94 – 10.167.208.95	10.167.208.95
49	10.167.208.96/31	10.167.208.96 – 10.167.208.97	10.167.208.97
50	10.167.208.98/31	10.167.208.98 – 10.167.208.99	10.167.208.99
51	10.167.208.100/31	10.167.208.100 – 10.167.208.101	10.167.208.101
52	10.167.208.102/31	10.167.208.102 – 10.167.208.103	10.167.208.103
53	10.167.208.104/31	10.167.208.104 – 10.167.208.105	10.167.208.105
54	10.167.208.106/31	10.167.208.106 – 10.167.208.107	10.167.208.107
55	10.167.208.108/31	10.167.208.108 – 10.167.208.109	10.167.208.109
56	10.167.208.110/31	10.167.208.110 – 10.167.208.111	10.167.208.111
57	10.167.208.112/31	10.167.208.112 – 10.167.208.113	10.167.208.113
58	10.167.208.114/31	10.167.208.114 – 10.167.208.115	10.167.208.115
59	10.167.208.116/31	10.167.208.116 – 10.167.208.117	10.167.208.117
60	10.167.208.118/31	10.167.208.118 – 10.167.208.119	10.167.208.119
61	10.167.208.120/31	10.167.208.120 – 10.167.208.121	10.167.208.121
62	10.167.208.122/31	10.167.208.122 – 10.167.208.123	10.167.208.123
63	10.167.208.124/31	10.167.208.124 – 10.167.208.125	10.167.208.125
64	10.167.208.126/31	10.167.208.126 – 10.167.208.127	10.167.208.127
65	10.167.208.128/31	10.167.208.128 – 10.167.208.129	10.167.208.129
66	10.167.208.130/31	10.167.208.130 – 10.167.208.131	10.167.208.131
67	10.167.208.132/31	10.167.208.132 – 10.167.208.133	10.167.208.133
68	10.167.208.134/31	10.167.208.134 – 10.167.208.135	10.167.208.135
69	10.167.208.136/31	10.167.208.136 – 10.167.208.137	10.167.208.137
70	10.167.208.138/31	10.167.208.138 – 10.167.208.139	10.167.208.139
71	10.167.208.140/31	10.167.208.140 – 10.167.208.141	10.167.208.141
72	10.167.208.142/31	10.167.208.142 – 10.167.208.143	10.167.208.143
73	10.167.208.144/31	10.167.208.144 – 10.167.208.145	10.167.208.145
74	10.167.208.146/31	10.167.208.146 – 10.167.208.147	10.167.208.147
75	10.167.208.148/31	10.167.208.148 – 10.167.208.149	10.167.208.149
76	10.167.208.150/31	10.167.208.150 – 10.167.208.151	10.167.208.151
77	10.167.208.152/31	10.167.208.152 – 10.167.208.153	10.167.208.153
78	10.167.208.154/31	10.167.208.154 – 10.167.208.155	10.167.208.155
79	10.167.208.156/31	10.167.208.156 – 10.167.208.157	10.167.208.157
80	10.167.208.158/31	10.167.208.158 – 10.167.208.159	10.167.208.159
81	10.167.208.160/31	10.167.208.160 – 10.167.208.161	10.167.208.161
82	10.167.208.162/31	10.167.208.162 – 10.167.208.163	10.167.208.163
83	10.167.208.164/31	10.167.208.164 – 10.167.208.165	10.167.208.165
84	10.167.208.166/31	10.167.208.166 – 10.167.208.167	10.167.208.167
85	10.167.208.168/31	10.167.208.168 – 10.167.208.169	10.167.208.169
86	10.167.208.170/31	10.167.208.170 – 10.167.208.171	10.167.208.171
87	10.167.208.172/31	10.167.208.172 – 10.167.208.173	10.167.208.173
88	10.167.208.174/31	10.167.208.174 – 10.167.208.175	10.167.208.175
89	10.167.208.176/31	10.167.208.176 – 10.167.208.177	10.167.208.177
90	10.167.208.178/31	10.167.208.178 – 10.167.208.179	10.167.208.179
91	10.167.208.180/31	10.167.208.180 – 10.167.208.181	10.167.208.181
92	10.167.208.182/31	10.167.208.182 – 10.167.208.183	10.167.208.183
93	10.167.208.184/31	10.167.208.184 – 10.167.208.185	10.167.208.185
94	10.167.208.186/31	10.167.208.186 – 10.167.208.187	10.167.208.187
95	10.167.208.188/31	10.167.208.188 – 10.167.208.189	10.167.208.189
96	10.167.208.190/31	10.167.208.190 – 10.167.208.191	10.167.208.191
97	10.167.208.192/31	10.167.208.192 – 10.167.208.193	10.167.208.193
98	10.167.208.194/31	10.167.208.194 – 10.167.208.195	10.167.208.195
99	10.167.208.196/31	10.167.208.196 – 10.167.208.197	10.167.208.197
100	10.167.208.198/31	10.167.208.198 – 10.167.208.199	10.167.208.199
101	10.167.208.200/31	10.167.208.200 – 10.167.208.201	10.167.208.201
102	10.167.208.202/31	10.167.208.202 – 10.167.208.203	10.167.208.203
103	10.167.208.204/31	10.167.208.204 – 10.167.208.205	10.167.208.205
104	10.167.208.206/31	10.167.208.206 – 10.167.208.207	10.167.208.207
105	10.167.208.208/31	10.167.208.208 – 10.167.208.209	10.167.208.209
106	10.167.208.210/31	10.167.208.210 – 10.167.208.211	10.167.208.211
107	10.167.208.212/31	10.167.208.212 – 10.167.208.213	10.167.208.213
108	10.167.208.214/31	10.167.208.214 – 10.167.208.215	10.167.208.215
109	10.167.208.216/31	10.167.208.216 – 10.167.208.217	10.167.208.217
110	10.167.208.218/31	10.167.208.218 – 10.167.208.219	10.167.208.219
111	10.167.208.220/31	10.167.208.220 – 10.167.208.221	10.167.208.221
112	10.167.208.222/31	10.167.208.222 – 10.167.208.223	10.167.208.223
113	10.167.208.224/31	10.167.208.224 – 10.167.208.225	10.167.208.225
114	10.167.208.226/31	10.167.208.226 – 10.167.208.227	10.167.208.227
115	10.167.208.228/31	10.167.208.228 – 10.167.208.229	10.167.208.229
116	10.167.208.230/31	10.167.208.230 – 10.167.208.231	10.167.208.231
117	10.167.208.232/31	10.167.208.232 – 10.167.208.233	10.167.208.233
118	10.167.208.234/31	10.167.208.234 – 10.167.208.235	10.167.208.235
119	10.167.208.236/31	10.167.208.236 – 10.167.208.237	10.167.208.237
120	10.167.208.238/31	10.167.208.238 – 10.167.208.239	10.167.208.239
121	10.167.208.240/31	10.167.208.240 – 10.167.208.241	10.167.208.241
122	10.167.208.242/31	10.167.208.242 – 10.167.208.243	10.167.208.243
123	10.167.208.244/31	10.167.208.244 – 10.167.208.245	10.167.208.245
124	10.167.208.246/31	10.167.208.246 – 10.167.208.247	10.167.208.247
125	10.167.208.248/31	10.167.208.248 – 10.167.208.249	10.167.208.249
126	10.167.208.250/31	10.167.208.250 – 10.167.208.251	10.167.208.251
127	10.167.208.252/31	10.167.208.252 – 10.167.208.253	10.167.208.253
128	10.167.208.254/31	10.167.208.254 – 10.167.208.255	10.167.208.255

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 →