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)10.167.43.0/24

network10.167.43.0/24

broadcast10.167.43.255

first host10.167.43.1

last host10.167.43.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.167.43.0/24

address00001010.10100111.00101011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.10100111.00101011.00000000

broadcast00001010.10100111.00101011.11111111

green = network part, grey = host part

hex0x0aa72b00

decimal178727680

reverse dns0.43.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:2b00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.43.0/31	10.167.43.0 – 10.167.43.1	10.167.43.1
2	10.167.43.2/31	10.167.43.2 – 10.167.43.3	10.167.43.3
3	10.167.43.4/31	10.167.43.4 – 10.167.43.5	10.167.43.5
4	10.167.43.6/31	10.167.43.6 – 10.167.43.7	10.167.43.7
5	10.167.43.8/31	10.167.43.8 – 10.167.43.9	10.167.43.9
6	10.167.43.10/31	10.167.43.10 – 10.167.43.11	10.167.43.11
7	10.167.43.12/31	10.167.43.12 – 10.167.43.13	10.167.43.13
8	10.167.43.14/31	10.167.43.14 – 10.167.43.15	10.167.43.15
9	10.167.43.16/31	10.167.43.16 – 10.167.43.17	10.167.43.17
10	10.167.43.18/31	10.167.43.18 – 10.167.43.19	10.167.43.19
11	10.167.43.20/31	10.167.43.20 – 10.167.43.21	10.167.43.21
12	10.167.43.22/31	10.167.43.22 – 10.167.43.23	10.167.43.23
13	10.167.43.24/31	10.167.43.24 – 10.167.43.25	10.167.43.25
14	10.167.43.26/31	10.167.43.26 – 10.167.43.27	10.167.43.27
15	10.167.43.28/31	10.167.43.28 – 10.167.43.29	10.167.43.29
16	10.167.43.30/31	10.167.43.30 – 10.167.43.31	10.167.43.31
17	10.167.43.32/31	10.167.43.32 – 10.167.43.33	10.167.43.33
18	10.167.43.34/31	10.167.43.34 – 10.167.43.35	10.167.43.35
19	10.167.43.36/31	10.167.43.36 – 10.167.43.37	10.167.43.37
20	10.167.43.38/31	10.167.43.38 – 10.167.43.39	10.167.43.39
21	10.167.43.40/31	10.167.43.40 – 10.167.43.41	10.167.43.41
22	10.167.43.42/31	10.167.43.42 – 10.167.43.43	10.167.43.43
23	10.167.43.44/31	10.167.43.44 – 10.167.43.45	10.167.43.45
24	10.167.43.46/31	10.167.43.46 – 10.167.43.47	10.167.43.47
25	10.167.43.48/31	10.167.43.48 – 10.167.43.49	10.167.43.49
26	10.167.43.50/31	10.167.43.50 – 10.167.43.51	10.167.43.51
27	10.167.43.52/31	10.167.43.52 – 10.167.43.53	10.167.43.53
28	10.167.43.54/31	10.167.43.54 – 10.167.43.55	10.167.43.55
29	10.167.43.56/31	10.167.43.56 – 10.167.43.57	10.167.43.57
30	10.167.43.58/31	10.167.43.58 – 10.167.43.59	10.167.43.59
31	10.167.43.60/31	10.167.43.60 – 10.167.43.61	10.167.43.61
32	10.167.43.62/31	10.167.43.62 – 10.167.43.63	10.167.43.63
33	10.167.43.64/31	10.167.43.64 – 10.167.43.65	10.167.43.65
34	10.167.43.66/31	10.167.43.66 – 10.167.43.67	10.167.43.67
35	10.167.43.68/31	10.167.43.68 – 10.167.43.69	10.167.43.69
36	10.167.43.70/31	10.167.43.70 – 10.167.43.71	10.167.43.71
37	10.167.43.72/31	10.167.43.72 – 10.167.43.73	10.167.43.73
38	10.167.43.74/31	10.167.43.74 – 10.167.43.75	10.167.43.75
39	10.167.43.76/31	10.167.43.76 – 10.167.43.77	10.167.43.77
40	10.167.43.78/31	10.167.43.78 – 10.167.43.79	10.167.43.79
41	10.167.43.80/31	10.167.43.80 – 10.167.43.81	10.167.43.81
42	10.167.43.82/31	10.167.43.82 – 10.167.43.83	10.167.43.83
43	10.167.43.84/31	10.167.43.84 – 10.167.43.85	10.167.43.85
44	10.167.43.86/31	10.167.43.86 – 10.167.43.87	10.167.43.87
45	10.167.43.88/31	10.167.43.88 – 10.167.43.89	10.167.43.89
46	10.167.43.90/31	10.167.43.90 – 10.167.43.91	10.167.43.91
47	10.167.43.92/31	10.167.43.92 – 10.167.43.93	10.167.43.93
48	10.167.43.94/31	10.167.43.94 – 10.167.43.95	10.167.43.95
49	10.167.43.96/31	10.167.43.96 – 10.167.43.97	10.167.43.97
50	10.167.43.98/31	10.167.43.98 – 10.167.43.99	10.167.43.99
51	10.167.43.100/31	10.167.43.100 – 10.167.43.101	10.167.43.101
52	10.167.43.102/31	10.167.43.102 – 10.167.43.103	10.167.43.103
53	10.167.43.104/31	10.167.43.104 – 10.167.43.105	10.167.43.105
54	10.167.43.106/31	10.167.43.106 – 10.167.43.107	10.167.43.107
55	10.167.43.108/31	10.167.43.108 – 10.167.43.109	10.167.43.109
56	10.167.43.110/31	10.167.43.110 – 10.167.43.111	10.167.43.111
57	10.167.43.112/31	10.167.43.112 – 10.167.43.113	10.167.43.113
58	10.167.43.114/31	10.167.43.114 – 10.167.43.115	10.167.43.115
59	10.167.43.116/31	10.167.43.116 – 10.167.43.117	10.167.43.117
60	10.167.43.118/31	10.167.43.118 – 10.167.43.119	10.167.43.119
61	10.167.43.120/31	10.167.43.120 – 10.167.43.121	10.167.43.121
62	10.167.43.122/31	10.167.43.122 – 10.167.43.123	10.167.43.123
63	10.167.43.124/31	10.167.43.124 – 10.167.43.125	10.167.43.125
64	10.167.43.126/31	10.167.43.126 – 10.167.43.127	10.167.43.127
65	10.167.43.128/31	10.167.43.128 – 10.167.43.129	10.167.43.129
66	10.167.43.130/31	10.167.43.130 – 10.167.43.131	10.167.43.131
67	10.167.43.132/31	10.167.43.132 – 10.167.43.133	10.167.43.133
68	10.167.43.134/31	10.167.43.134 – 10.167.43.135	10.167.43.135
69	10.167.43.136/31	10.167.43.136 – 10.167.43.137	10.167.43.137
70	10.167.43.138/31	10.167.43.138 – 10.167.43.139	10.167.43.139
71	10.167.43.140/31	10.167.43.140 – 10.167.43.141	10.167.43.141
72	10.167.43.142/31	10.167.43.142 – 10.167.43.143	10.167.43.143
73	10.167.43.144/31	10.167.43.144 – 10.167.43.145	10.167.43.145
74	10.167.43.146/31	10.167.43.146 – 10.167.43.147	10.167.43.147
75	10.167.43.148/31	10.167.43.148 – 10.167.43.149	10.167.43.149
76	10.167.43.150/31	10.167.43.150 – 10.167.43.151	10.167.43.151
77	10.167.43.152/31	10.167.43.152 – 10.167.43.153	10.167.43.153
78	10.167.43.154/31	10.167.43.154 – 10.167.43.155	10.167.43.155
79	10.167.43.156/31	10.167.43.156 – 10.167.43.157	10.167.43.157
80	10.167.43.158/31	10.167.43.158 – 10.167.43.159	10.167.43.159
81	10.167.43.160/31	10.167.43.160 – 10.167.43.161	10.167.43.161
82	10.167.43.162/31	10.167.43.162 – 10.167.43.163	10.167.43.163
83	10.167.43.164/31	10.167.43.164 – 10.167.43.165	10.167.43.165
84	10.167.43.166/31	10.167.43.166 – 10.167.43.167	10.167.43.167
85	10.167.43.168/31	10.167.43.168 – 10.167.43.169	10.167.43.169
86	10.167.43.170/31	10.167.43.170 – 10.167.43.171	10.167.43.171
87	10.167.43.172/31	10.167.43.172 – 10.167.43.173	10.167.43.173
88	10.167.43.174/31	10.167.43.174 – 10.167.43.175	10.167.43.175
89	10.167.43.176/31	10.167.43.176 – 10.167.43.177	10.167.43.177
90	10.167.43.178/31	10.167.43.178 – 10.167.43.179	10.167.43.179
91	10.167.43.180/31	10.167.43.180 – 10.167.43.181	10.167.43.181
92	10.167.43.182/31	10.167.43.182 – 10.167.43.183	10.167.43.183
93	10.167.43.184/31	10.167.43.184 – 10.167.43.185	10.167.43.185
94	10.167.43.186/31	10.167.43.186 – 10.167.43.187	10.167.43.187
95	10.167.43.188/31	10.167.43.188 – 10.167.43.189	10.167.43.189
96	10.167.43.190/31	10.167.43.190 – 10.167.43.191	10.167.43.191
97	10.167.43.192/31	10.167.43.192 – 10.167.43.193	10.167.43.193
98	10.167.43.194/31	10.167.43.194 – 10.167.43.195	10.167.43.195
99	10.167.43.196/31	10.167.43.196 – 10.167.43.197	10.167.43.197
100	10.167.43.198/31	10.167.43.198 – 10.167.43.199	10.167.43.199
101	10.167.43.200/31	10.167.43.200 – 10.167.43.201	10.167.43.201
102	10.167.43.202/31	10.167.43.202 – 10.167.43.203	10.167.43.203
103	10.167.43.204/31	10.167.43.204 – 10.167.43.205	10.167.43.205
104	10.167.43.206/31	10.167.43.206 – 10.167.43.207	10.167.43.207
105	10.167.43.208/31	10.167.43.208 – 10.167.43.209	10.167.43.209
106	10.167.43.210/31	10.167.43.210 – 10.167.43.211	10.167.43.211
107	10.167.43.212/31	10.167.43.212 – 10.167.43.213	10.167.43.213
108	10.167.43.214/31	10.167.43.214 – 10.167.43.215	10.167.43.215
109	10.167.43.216/31	10.167.43.216 – 10.167.43.217	10.167.43.217
110	10.167.43.218/31	10.167.43.218 – 10.167.43.219	10.167.43.219
111	10.167.43.220/31	10.167.43.220 – 10.167.43.221	10.167.43.221
112	10.167.43.222/31	10.167.43.222 – 10.167.43.223	10.167.43.223
113	10.167.43.224/31	10.167.43.224 – 10.167.43.225	10.167.43.225
114	10.167.43.226/31	10.167.43.226 – 10.167.43.227	10.167.43.227
115	10.167.43.228/31	10.167.43.228 – 10.167.43.229	10.167.43.229
116	10.167.43.230/31	10.167.43.230 – 10.167.43.231	10.167.43.231
117	10.167.43.232/31	10.167.43.232 – 10.167.43.233	10.167.43.233
118	10.167.43.234/31	10.167.43.234 – 10.167.43.235	10.167.43.235
119	10.167.43.236/31	10.167.43.236 – 10.167.43.237	10.167.43.237
120	10.167.43.238/31	10.167.43.238 – 10.167.43.239	10.167.43.239
121	10.167.43.240/31	10.167.43.240 – 10.167.43.241	10.167.43.241
122	10.167.43.242/31	10.167.43.242 – 10.167.43.243	10.167.43.243
123	10.167.43.244/31	10.167.43.244 – 10.167.43.245	10.167.43.245
124	10.167.43.246/31	10.167.43.246 – 10.167.43.247	10.167.43.247
125	10.167.43.248/31	10.167.43.248 – 10.167.43.249	10.167.43.249
126	10.167.43.250/31	10.167.43.250 – 10.167.43.251	10.167.43.251
127	10.167.43.252/31	10.167.43.252 – 10.167.43.253	10.167.43.253
128	10.167.43.254/31	10.167.43.254 – 10.167.43.255	10.167.43.255

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 →