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)10.2.159.0/24

network10.2.159.0/24

broadcast10.2.159.255

first host10.2.159.1

last host10.2.159.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.159.0/24

address00001010.00000010.10011111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.10011111.00000000

broadcast00001010.00000010.10011111.11111111

green = network part, grey = host part

hex0x0a029f00

decimal167943936

reverse dns0.159.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:9f00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.159.0/31	10.2.159.0 – 10.2.159.1	10.2.159.1
2	10.2.159.2/31	10.2.159.2 – 10.2.159.3	10.2.159.3
3	10.2.159.4/31	10.2.159.4 – 10.2.159.5	10.2.159.5
4	10.2.159.6/31	10.2.159.6 – 10.2.159.7	10.2.159.7
5	10.2.159.8/31	10.2.159.8 – 10.2.159.9	10.2.159.9
6	10.2.159.10/31	10.2.159.10 – 10.2.159.11	10.2.159.11
7	10.2.159.12/31	10.2.159.12 – 10.2.159.13	10.2.159.13
8	10.2.159.14/31	10.2.159.14 – 10.2.159.15	10.2.159.15
9	10.2.159.16/31	10.2.159.16 – 10.2.159.17	10.2.159.17
10	10.2.159.18/31	10.2.159.18 – 10.2.159.19	10.2.159.19
11	10.2.159.20/31	10.2.159.20 – 10.2.159.21	10.2.159.21
12	10.2.159.22/31	10.2.159.22 – 10.2.159.23	10.2.159.23
13	10.2.159.24/31	10.2.159.24 – 10.2.159.25	10.2.159.25
14	10.2.159.26/31	10.2.159.26 – 10.2.159.27	10.2.159.27
15	10.2.159.28/31	10.2.159.28 – 10.2.159.29	10.2.159.29
16	10.2.159.30/31	10.2.159.30 – 10.2.159.31	10.2.159.31
17	10.2.159.32/31	10.2.159.32 – 10.2.159.33	10.2.159.33
18	10.2.159.34/31	10.2.159.34 – 10.2.159.35	10.2.159.35
19	10.2.159.36/31	10.2.159.36 – 10.2.159.37	10.2.159.37
20	10.2.159.38/31	10.2.159.38 – 10.2.159.39	10.2.159.39
21	10.2.159.40/31	10.2.159.40 – 10.2.159.41	10.2.159.41
22	10.2.159.42/31	10.2.159.42 – 10.2.159.43	10.2.159.43
23	10.2.159.44/31	10.2.159.44 – 10.2.159.45	10.2.159.45
24	10.2.159.46/31	10.2.159.46 – 10.2.159.47	10.2.159.47
25	10.2.159.48/31	10.2.159.48 – 10.2.159.49	10.2.159.49
26	10.2.159.50/31	10.2.159.50 – 10.2.159.51	10.2.159.51
27	10.2.159.52/31	10.2.159.52 – 10.2.159.53	10.2.159.53
28	10.2.159.54/31	10.2.159.54 – 10.2.159.55	10.2.159.55
29	10.2.159.56/31	10.2.159.56 – 10.2.159.57	10.2.159.57
30	10.2.159.58/31	10.2.159.58 – 10.2.159.59	10.2.159.59
31	10.2.159.60/31	10.2.159.60 – 10.2.159.61	10.2.159.61
32	10.2.159.62/31	10.2.159.62 – 10.2.159.63	10.2.159.63
33	10.2.159.64/31	10.2.159.64 – 10.2.159.65	10.2.159.65
34	10.2.159.66/31	10.2.159.66 – 10.2.159.67	10.2.159.67
35	10.2.159.68/31	10.2.159.68 – 10.2.159.69	10.2.159.69
36	10.2.159.70/31	10.2.159.70 – 10.2.159.71	10.2.159.71
37	10.2.159.72/31	10.2.159.72 – 10.2.159.73	10.2.159.73
38	10.2.159.74/31	10.2.159.74 – 10.2.159.75	10.2.159.75
39	10.2.159.76/31	10.2.159.76 – 10.2.159.77	10.2.159.77
40	10.2.159.78/31	10.2.159.78 – 10.2.159.79	10.2.159.79
41	10.2.159.80/31	10.2.159.80 – 10.2.159.81	10.2.159.81
42	10.2.159.82/31	10.2.159.82 – 10.2.159.83	10.2.159.83
43	10.2.159.84/31	10.2.159.84 – 10.2.159.85	10.2.159.85
44	10.2.159.86/31	10.2.159.86 – 10.2.159.87	10.2.159.87
45	10.2.159.88/31	10.2.159.88 – 10.2.159.89	10.2.159.89
46	10.2.159.90/31	10.2.159.90 – 10.2.159.91	10.2.159.91
47	10.2.159.92/31	10.2.159.92 – 10.2.159.93	10.2.159.93
48	10.2.159.94/31	10.2.159.94 – 10.2.159.95	10.2.159.95
49	10.2.159.96/31	10.2.159.96 – 10.2.159.97	10.2.159.97
50	10.2.159.98/31	10.2.159.98 – 10.2.159.99	10.2.159.99
51	10.2.159.100/31	10.2.159.100 – 10.2.159.101	10.2.159.101
52	10.2.159.102/31	10.2.159.102 – 10.2.159.103	10.2.159.103
53	10.2.159.104/31	10.2.159.104 – 10.2.159.105	10.2.159.105
54	10.2.159.106/31	10.2.159.106 – 10.2.159.107	10.2.159.107
55	10.2.159.108/31	10.2.159.108 – 10.2.159.109	10.2.159.109
56	10.2.159.110/31	10.2.159.110 – 10.2.159.111	10.2.159.111
57	10.2.159.112/31	10.2.159.112 – 10.2.159.113	10.2.159.113
58	10.2.159.114/31	10.2.159.114 – 10.2.159.115	10.2.159.115
59	10.2.159.116/31	10.2.159.116 – 10.2.159.117	10.2.159.117
60	10.2.159.118/31	10.2.159.118 – 10.2.159.119	10.2.159.119
61	10.2.159.120/31	10.2.159.120 – 10.2.159.121	10.2.159.121
62	10.2.159.122/31	10.2.159.122 – 10.2.159.123	10.2.159.123
63	10.2.159.124/31	10.2.159.124 – 10.2.159.125	10.2.159.125
64	10.2.159.126/31	10.2.159.126 – 10.2.159.127	10.2.159.127
65	10.2.159.128/31	10.2.159.128 – 10.2.159.129	10.2.159.129
66	10.2.159.130/31	10.2.159.130 – 10.2.159.131	10.2.159.131
67	10.2.159.132/31	10.2.159.132 – 10.2.159.133	10.2.159.133
68	10.2.159.134/31	10.2.159.134 – 10.2.159.135	10.2.159.135
69	10.2.159.136/31	10.2.159.136 – 10.2.159.137	10.2.159.137
70	10.2.159.138/31	10.2.159.138 – 10.2.159.139	10.2.159.139
71	10.2.159.140/31	10.2.159.140 – 10.2.159.141	10.2.159.141
72	10.2.159.142/31	10.2.159.142 – 10.2.159.143	10.2.159.143
73	10.2.159.144/31	10.2.159.144 – 10.2.159.145	10.2.159.145
74	10.2.159.146/31	10.2.159.146 – 10.2.159.147	10.2.159.147
75	10.2.159.148/31	10.2.159.148 – 10.2.159.149	10.2.159.149
76	10.2.159.150/31	10.2.159.150 – 10.2.159.151	10.2.159.151
77	10.2.159.152/31	10.2.159.152 – 10.2.159.153	10.2.159.153
78	10.2.159.154/31	10.2.159.154 – 10.2.159.155	10.2.159.155
79	10.2.159.156/31	10.2.159.156 – 10.2.159.157	10.2.159.157
80	10.2.159.158/31	10.2.159.158 – 10.2.159.159	10.2.159.159
81	10.2.159.160/31	10.2.159.160 – 10.2.159.161	10.2.159.161
82	10.2.159.162/31	10.2.159.162 – 10.2.159.163	10.2.159.163
83	10.2.159.164/31	10.2.159.164 – 10.2.159.165	10.2.159.165
84	10.2.159.166/31	10.2.159.166 – 10.2.159.167	10.2.159.167
85	10.2.159.168/31	10.2.159.168 – 10.2.159.169	10.2.159.169
86	10.2.159.170/31	10.2.159.170 – 10.2.159.171	10.2.159.171
87	10.2.159.172/31	10.2.159.172 – 10.2.159.173	10.2.159.173
88	10.2.159.174/31	10.2.159.174 – 10.2.159.175	10.2.159.175
89	10.2.159.176/31	10.2.159.176 – 10.2.159.177	10.2.159.177
90	10.2.159.178/31	10.2.159.178 – 10.2.159.179	10.2.159.179
91	10.2.159.180/31	10.2.159.180 – 10.2.159.181	10.2.159.181
92	10.2.159.182/31	10.2.159.182 – 10.2.159.183	10.2.159.183
93	10.2.159.184/31	10.2.159.184 – 10.2.159.185	10.2.159.185
94	10.2.159.186/31	10.2.159.186 – 10.2.159.187	10.2.159.187
95	10.2.159.188/31	10.2.159.188 – 10.2.159.189	10.2.159.189
96	10.2.159.190/31	10.2.159.190 – 10.2.159.191	10.2.159.191
97	10.2.159.192/31	10.2.159.192 – 10.2.159.193	10.2.159.193
98	10.2.159.194/31	10.2.159.194 – 10.2.159.195	10.2.159.195
99	10.2.159.196/31	10.2.159.196 – 10.2.159.197	10.2.159.197
100	10.2.159.198/31	10.2.159.198 – 10.2.159.199	10.2.159.199
101	10.2.159.200/31	10.2.159.200 – 10.2.159.201	10.2.159.201
102	10.2.159.202/31	10.2.159.202 – 10.2.159.203	10.2.159.203
103	10.2.159.204/31	10.2.159.204 – 10.2.159.205	10.2.159.205
104	10.2.159.206/31	10.2.159.206 – 10.2.159.207	10.2.159.207
105	10.2.159.208/31	10.2.159.208 – 10.2.159.209	10.2.159.209
106	10.2.159.210/31	10.2.159.210 – 10.2.159.211	10.2.159.211
107	10.2.159.212/31	10.2.159.212 – 10.2.159.213	10.2.159.213
108	10.2.159.214/31	10.2.159.214 – 10.2.159.215	10.2.159.215
109	10.2.159.216/31	10.2.159.216 – 10.2.159.217	10.2.159.217
110	10.2.159.218/31	10.2.159.218 – 10.2.159.219	10.2.159.219
111	10.2.159.220/31	10.2.159.220 – 10.2.159.221	10.2.159.221
112	10.2.159.222/31	10.2.159.222 – 10.2.159.223	10.2.159.223
113	10.2.159.224/31	10.2.159.224 – 10.2.159.225	10.2.159.225
114	10.2.159.226/31	10.2.159.226 – 10.2.159.227	10.2.159.227
115	10.2.159.228/31	10.2.159.228 – 10.2.159.229	10.2.159.229
116	10.2.159.230/31	10.2.159.230 – 10.2.159.231	10.2.159.231
117	10.2.159.232/31	10.2.159.232 – 10.2.159.233	10.2.159.233
118	10.2.159.234/31	10.2.159.234 – 10.2.159.235	10.2.159.235
119	10.2.159.236/31	10.2.159.236 – 10.2.159.237	10.2.159.237
120	10.2.159.238/31	10.2.159.238 – 10.2.159.239	10.2.159.239
121	10.2.159.240/31	10.2.159.240 – 10.2.159.241	10.2.159.241
122	10.2.159.242/31	10.2.159.242 – 10.2.159.243	10.2.159.243
123	10.2.159.244/31	10.2.159.244 – 10.2.159.245	10.2.159.245
124	10.2.159.246/31	10.2.159.246 – 10.2.159.247	10.2.159.247
125	10.2.159.248/31	10.2.159.248 – 10.2.159.249	10.2.159.249
126	10.2.159.250/31	10.2.159.250 – 10.2.159.251	10.2.159.251
127	10.2.159.252/31	10.2.159.252 – 10.2.159.253	10.2.159.253
128	10.2.159.254/31	10.2.159.254 – 10.2.159.255	10.2.159.255

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 →