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)10.243.158.0/24

network10.243.158.0/24

broadcast10.243.158.255

first host10.243.158.1

last host10.243.158.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.243.158.0/24

address00001010.11110011.10011110.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.11110011.10011110.00000000

broadcast00001010.11110011.10011110.11111111

green = network part, grey = host part

hex0x0af39e00

decimal183737856

reverse dns0.158.243.10.in-addr.arpa

ipv4-mapped::ffff:af3:9e00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.243.158.0/31	10.243.158.0 – 10.243.158.1	10.243.158.1
2	10.243.158.2/31	10.243.158.2 – 10.243.158.3	10.243.158.3
3	10.243.158.4/31	10.243.158.4 – 10.243.158.5	10.243.158.5
4	10.243.158.6/31	10.243.158.6 – 10.243.158.7	10.243.158.7
5	10.243.158.8/31	10.243.158.8 – 10.243.158.9	10.243.158.9
6	10.243.158.10/31	10.243.158.10 – 10.243.158.11	10.243.158.11
7	10.243.158.12/31	10.243.158.12 – 10.243.158.13	10.243.158.13
8	10.243.158.14/31	10.243.158.14 – 10.243.158.15	10.243.158.15
9	10.243.158.16/31	10.243.158.16 – 10.243.158.17	10.243.158.17
10	10.243.158.18/31	10.243.158.18 – 10.243.158.19	10.243.158.19
11	10.243.158.20/31	10.243.158.20 – 10.243.158.21	10.243.158.21
12	10.243.158.22/31	10.243.158.22 – 10.243.158.23	10.243.158.23
13	10.243.158.24/31	10.243.158.24 – 10.243.158.25	10.243.158.25
14	10.243.158.26/31	10.243.158.26 – 10.243.158.27	10.243.158.27
15	10.243.158.28/31	10.243.158.28 – 10.243.158.29	10.243.158.29
16	10.243.158.30/31	10.243.158.30 – 10.243.158.31	10.243.158.31
17	10.243.158.32/31	10.243.158.32 – 10.243.158.33	10.243.158.33
18	10.243.158.34/31	10.243.158.34 – 10.243.158.35	10.243.158.35
19	10.243.158.36/31	10.243.158.36 – 10.243.158.37	10.243.158.37
20	10.243.158.38/31	10.243.158.38 – 10.243.158.39	10.243.158.39
21	10.243.158.40/31	10.243.158.40 – 10.243.158.41	10.243.158.41
22	10.243.158.42/31	10.243.158.42 – 10.243.158.43	10.243.158.43
23	10.243.158.44/31	10.243.158.44 – 10.243.158.45	10.243.158.45
24	10.243.158.46/31	10.243.158.46 – 10.243.158.47	10.243.158.47
25	10.243.158.48/31	10.243.158.48 – 10.243.158.49	10.243.158.49
26	10.243.158.50/31	10.243.158.50 – 10.243.158.51	10.243.158.51
27	10.243.158.52/31	10.243.158.52 – 10.243.158.53	10.243.158.53
28	10.243.158.54/31	10.243.158.54 – 10.243.158.55	10.243.158.55
29	10.243.158.56/31	10.243.158.56 – 10.243.158.57	10.243.158.57
30	10.243.158.58/31	10.243.158.58 – 10.243.158.59	10.243.158.59
31	10.243.158.60/31	10.243.158.60 – 10.243.158.61	10.243.158.61
32	10.243.158.62/31	10.243.158.62 – 10.243.158.63	10.243.158.63
33	10.243.158.64/31	10.243.158.64 – 10.243.158.65	10.243.158.65
34	10.243.158.66/31	10.243.158.66 – 10.243.158.67	10.243.158.67
35	10.243.158.68/31	10.243.158.68 – 10.243.158.69	10.243.158.69
36	10.243.158.70/31	10.243.158.70 – 10.243.158.71	10.243.158.71
37	10.243.158.72/31	10.243.158.72 – 10.243.158.73	10.243.158.73
38	10.243.158.74/31	10.243.158.74 – 10.243.158.75	10.243.158.75
39	10.243.158.76/31	10.243.158.76 – 10.243.158.77	10.243.158.77
40	10.243.158.78/31	10.243.158.78 – 10.243.158.79	10.243.158.79
41	10.243.158.80/31	10.243.158.80 – 10.243.158.81	10.243.158.81
42	10.243.158.82/31	10.243.158.82 – 10.243.158.83	10.243.158.83
43	10.243.158.84/31	10.243.158.84 – 10.243.158.85	10.243.158.85
44	10.243.158.86/31	10.243.158.86 – 10.243.158.87	10.243.158.87
45	10.243.158.88/31	10.243.158.88 – 10.243.158.89	10.243.158.89
46	10.243.158.90/31	10.243.158.90 – 10.243.158.91	10.243.158.91
47	10.243.158.92/31	10.243.158.92 – 10.243.158.93	10.243.158.93
48	10.243.158.94/31	10.243.158.94 – 10.243.158.95	10.243.158.95
49	10.243.158.96/31	10.243.158.96 – 10.243.158.97	10.243.158.97
50	10.243.158.98/31	10.243.158.98 – 10.243.158.99	10.243.158.99
51	10.243.158.100/31	10.243.158.100 – 10.243.158.101	10.243.158.101
52	10.243.158.102/31	10.243.158.102 – 10.243.158.103	10.243.158.103
53	10.243.158.104/31	10.243.158.104 – 10.243.158.105	10.243.158.105
54	10.243.158.106/31	10.243.158.106 – 10.243.158.107	10.243.158.107
55	10.243.158.108/31	10.243.158.108 – 10.243.158.109	10.243.158.109
56	10.243.158.110/31	10.243.158.110 – 10.243.158.111	10.243.158.111
57	10.243.158.112/31	10.243.158.112 – 10.243.158.113	10.243.158.113
58	10.243.158.114/31	10.243.158.114 – 10.243.158.115	10.243.158.115
59	10.243.158.116/31	10.243.158.116 – 10.243.158.117	10.243.158.117
60	10.243.158.118/31	10.243.158.118 – 10.243.158.119	10.243.158.119
61	10.243.158.120/31	10.243.158.120 – 10.243.158.121	10.243.158.121
62	10.243.158.122/31	10.243.158.122 – 10.243.158.123	10.243.158.123
63	10.243.158.124/31	10.243.158.124 – 10.243.158.125	10.243.158.125
64	10.243.158.126/31	10.243.158.126 – 10.243.158.127	10.243.158.127
65	10.243.158.128/31	10.243.158.128 – 10.243.158.129	10.243.158.129
66	10.243.158.130/31	10.243.158.130 – 10.243.158.131	10.243.158.131
67	10.243.158.132/31	10.243.158.132 – 10.243.158.133	10.243.158.133
68	10.243.158.134/31	10.243.158.134 – 10.243.158.135	10.243.158.135
69	10.243.158.136/31	10.243.158.136 – 10.243.158.137	10.243.158.137
70	10.243.158.138/31	10.243.158.138 – 10.243.158.139	10.243.158.139
71	10.243.158.140/31	10.243.158.140 – 10.243.158.141	10.243.158.141
72	10.243.158.142/31	10.243.158.142 – 10.243.158.143	10.243.158.143
73	10.243.158.144/31	10.243.158.144 – 10.243.158.145	10.243.158.145
74	10.243.158.146/31	10.243.158.146 – 10.243.158.147	10.243.158.147
75	10.243.158.148/31	10.243.158.148 – 10.243.158.149	10.243.158.149
76	10.243.158.150/31	10.243.158.150 – 10.243.158.151	10.243.158.151
77	10.243.158.152/31	10.243.158.152 – 10.243.158.153	10.243.158.153
78	10.243.158.154/31	10.243.158.154 – 10.243.158.155	10.243.158.155
79	10.243.158.156/31	10.243.158.156 – 10.243.158.157	10.243.158.157
80	10.243.158.158/31	10.243.158.158 – 10.243.158.159	10.243.158.159
81	10.243.158.160/31	10.243.158.160 – 10.243.158.161	10.243.158.161
82	10.243.158.162/31	10.243.158.162 – 10.243.158.163	10.243.158.163
83	10.243.158.164/31	10.243.158.164 – 10.243.158.165	10.243.158.165
84	10.243.158.166/31	10.243.158.166 – 10.243.158.167	10.243.158.167
85	10.243.158.168/31	10.243.158.168 – 10.243.158.169	10.243.158.169
86	10.243.158.170/31	10.243.158.170 – 10.243.158.171	10.243.158.171
87	10.243.158.172/31	10.243.158.172 – 10.243.158.173	10.243.158.173
88	10.243.158.174/31	10.243.158.174 – 10.243.158.175	10.243.158.175
89	10.243.158.176/31	10.243.158.176 – 10.243.158.177	10.243.158.177
90	10.243.158.178/31	10.243.158.178 – 10.243.158.179	10.243.158.179
91	10.243.158.180/31	10.243.158.180 – 10.243.158.181	10.243.158.181
92	10.243.158.182/31	10.243.158.182 – 10.243.158.183	10.243.158.183
93	10.243.158.184/31	10.243.158.184 – 10.243.158.185	10.243.158.185
94	10.243.158.186/31	10.243.158.186 – 10.243.158.187	10.243.158.187
95	10.243.158.188/31	10.243.158.188 – 10.243.158.189	10.243.158.189
96	10.243.158.190/31	10.243.158.190 – 10.243.158.191	10.243.158.191
97	10.243.158.192/31	10.243.158.192 – 10.243.158.193	10.243.158.193
98	10.243.158.194/31	10.243.158.194 – 10.243.158.195	10.243.158.195
99	10.243.158.196/31	10.243.158.196 – 10.243.158.197	10.243.158.197
100	10.243.158.198/31	10.243.158.198 – 10.243.158.199	10.243.158.199
101	10.243.158.200/31	10.243.158.200 – 10.243.158.201	10.243.158.201
102	10.243.158.202/31	10.243.158.202 – 10.243.158.203	10.243.158.203
103	10.243.158.204/31	10.243.158.204 – 10.243.158.205	10.243.158.205
104	10.243.158.206/31	10.243.158.206 – 10.243.158.207	10.243.158.207
105	10.243.158.208/31	10.243.158.208 – 10.243.158.209	10.243.158.209
106	10.243.158.210/31	10.243.158.210 – 10.243.158.211	10.243.158.211
107	10.243.158.212/31	10.243.158.212 – 10.243.158.213	10.243.158.213
108	10.243.158.214/31	10.243.158.214 – 10.243.158.215	10.243.158.215
109	10.243.158.216/31	10.243.158.216 – 10.243.158.217	10.243.158.217
110	10.243.158.218/31	10.243.158.218 – 10.243.158.219	10.243.158.219
111	10.243.158.220/31	10.243.158.220 – 10.243.158.221	10.243.158.221
112	10.243.158.222/31	10.243.158.222 – 10.243.158.223	10.243.158.223
113	10.243.158.224/31	10.243.158.224 – 10.243.158.225	10.243.158.225
114	10.243.158.226/31	10.243.158.226 – 10.243.158.227	10.243.158.227
115	10.243.158.228/31	10.243.158.228 – 10.243.158.229	10.243.158.229
116	10.243.158.230/31	10.243.158.230 – 10.243.158.231	10.243.158.231
117	10.243.158.232/31	10.243.158.232 – 10.243.158.233	10.243.158.233
118	10.243.158.234/31	10.243.158.234 – 10.243.158.235	10.243.158.235
119	10.243.158.236/31	10.243.158.236 – 10.243.158.237	10.243.158.237
120	10.243.158.238/31	10.243.158.238 – 10.243.158.239	10.243.158.239
121	10.243.158.240/31	10.243.158.240 – 10.243.158.241	10.243.158.241
122	10.243.158.242/31	10.243.158.242 – 10.243.158.243	10.243.158.243
123	10.243.158.244/31	10.243.158.244 – 10.243.158.245	10.243.158.245
124	10.243.158.246/31	10.243.158.246 – 10.243.158.247	10.243.158.247
125	10.243.158.248/31	10.243.158.248 – 10.243.158.249	10.243.158.249
126	10.243.158.250/31	10.243.158.250 – 10.243.158.251	10.243.158.251
127	10.243.158.252/31	10.243.158.252 – 10.243.158.253	10.243.158.253
128	10.243.158.254/31	10.243.158.254 – 10.243.158.255	10.243.158.255

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 →