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)10.2.238.0/24

network10.2.238.0/24

broadcast10.2.238.255

first host10.2.238.1

last host10.2.238.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.238.0/24

address00001010.00000010.11101110.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.11101110.00000000

broadcast00001010.00000010.11101110.11111111

green = network part, grey = host part

hex0x0a02ee00

decimal167964160

reverse dns0.238.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:ee00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.238.0/31	10.2.238.0 – 10.2.238.1	10.2.238.1
2	10.2.238.2/31	10.2.238.2 – 10.2.238.3	10.2.238.3
3	10.2.238.4/31	10.2.238.4 – 10.2.238.5	10.2.238.5
4	10.2.238.6/31	10.2.238.6 – 10.2.238.7	10.2.238.7
5	10.2.238.8/31	10.2.238.8 – 10.2.238.9	10.2.238.9
6	10.2.238.10/31	10.2.238.10 – 10.2.238.11	10.2.238.11
7	10.2.238.12/31	10.2.238.12 – 10.2.238.13	10.2.238.13
8	10.2.238.14/31	10.2.238.14 – 10.2.238.15	10.2.238.15
9	10.2.238.16/31	10.2.238.16 – 10.2.238.17	10.2.238.17
10	10.2.238.18/31	10.2.238.18 – 10.2.238.19	10.2.238.19
11	10.2.238.20/31	10.2.238.20 – 10.2.238.21	10.2.238.21
12	10.2.238.22/31	10.2.238.22 – 10.2.238.23	10.2.238.23
13	10.2.238.24/31	10.2.238.24 – 10.2.238.25	10.2.238.25
14	10.2.238.26/31	10.2.238.26 – 10.2.238.27	10.2.238.27
15	10.2.238.28/31	10.2.238.28 – 10.2.238.29	10.2.238.29
16	10.2.238.30/31	10.2.238.30 – 10.2.238.31	10.2.238.31
17	10.2.238.32/31	10.2.238.32 – 10.2.238.33	10.2.238.33
18	10.2.238.34/31	10.2.238.34 – 10.2.238.35	10.2.238.35
19	10.2.238.36/31	10.2.238.36 – 10.2.238.37	10.2.238.37
20	10.2.238.38/31	10.2.238.38 – 10.2.238.39	10.2.238.39
21	10.2.238.40/31	10.2.238.40 – 10.2.238.41	10.2.238.41
22	10.2.238.42/31	10.2.238.42 – 10.2.238.43	10.2.238.43
23	10.2.238.44/31	10.2.238.44 – 10.2.238.45	10.2.238.45
24	10.2.238.46/31	10.2.238.46 – 10.2.238.47	10.2.238.47
25	10.2.238.48/31	10.2.238.48 – 10.2.238.49	10.2.238.49
26	10.2.238.50/31	10.2.238.50 – 10.2.238.51	10.2.238.51
27	10.2.238.52/31	10.2.238.52 – 10.2.238.53	10.2.238.53
28	10.2.238.54/31	10.2.238.54 – 10.2.238.55	10.2.238.55
29	10.2.238.56/31	10.2.238.56 – 10.2.238.57	10.2.238.57
30	10.2.238.58/31	10.2.238.58 – 10.2.238.59	10.2.238.59
31	10.2.238.60/31	10.2.238.60 – 10.2.238.61	10.2.238.61
32	10.2.238.62/31	10.2.238.62 – 10.2.238.63	10.2.238.63
33	10.2.238.64/31	10.2.238.64 – 10.2.238.65	10.2.238.65
34	10.2.238.66/31	10.2.238.66 – 10.2.238.67	10.2.238.67
35	10.2.238.68/31	10.2.238.68 – 10.2.238.69	10.2.238.69
36	10.2.238.70/31	10.2.238.70 – 10.2.238.71	10.2.238.71
37	10.2.238.72/31	10.2.238.72 – 10.2.238.73	10.2.238.73
38	10.2.238.74/31	10.2.238.74 – 10.2.238.75	10.2.238.75
39	10.2.238.76/31	10.2.238.76 – 10.2.238.77	10.2.238.77
40	10.2.238.78/31	10.2.238.78 – 10.2.238.79	10.2.238.79
41	10.2.238.80/31	10.2.238.80 – 10.2.238.81	10.2.238.81
42	10.2.238.82/31	10.2.238.82 – 10.2.238.83	10.2.238.83
43	10.2.238.84/31	10.2.238.84 – 10.2.238.85	10.2.238.85
44	10.2.238.86/31	10.2.238.86 – 10.2.238.87	10.2.238.87
45	10.2.238.88/31	10.2.238.88 – 10.2.238.89	10.2.238.89
46	10.2.238.90/31	10.2.238.90 – 10.2.238.91	10.2.238.91
47	10.2.238.92/31	10.2.238.92 – 10.2.238.93	10.2.238.93
48	10.2.238.94/31	10.2.238.94 – 10.2.238.95	10.2.238.95
49	10.2.238.96/31	10.2.238.96 – 10.2.238.97	10.2.238.97
50	10.2.238.98/31	10.2.238.98 – 10.2.238.99	10.2.238.99
51	10.2.238.100/31	10.2.238.100 – 10.2.238.101	10.2.238.101
52	10.2.238.102/31	10.2.238.102 – 10.2.238.103	10.2.238.103
53	10.2.238.104/31	10.2.238.104 – 10.2.238.105	10.2.238.105
54	10.2.238.106/31	10.2.238.106 – 10.2.238.107	10.2.238.107
55	10.2.238.108/31	10.2.238.108 – 10.2.238.109	10.2.238.109
56	10.2.238.110/31	10.2.238.110 – 10.2.238.111	10.2.238.111
57	10.2.238.112/31	10.2.238.112 – 10.2.238.113	10.2.238.113
58	10.2.238.114/31	10.2.238.114 – 10.2.238.115	10.2.238.115
59	10.2.238.116/31	10.2.238.116 – 10.2.238.117	10.2.238.117
60	10.2.238.118/31	10.2.238.118 – 10.2.238.119	10.2.238.119
61	10.2.238.120/31	10.2.238.120 – 10.2.238.121	10.2.238.121
62	10.2.238.122/31	10.2.238.122 – 10.2.238.123	10.2.238.123
63	10.2.238.124/31	10.2.238.124 – 10.2.238.125	10.2.238.125
64	10.2.238.126/31	10.2.238.126 – 10.2.238.127	10.2.238.127
65	10.2.238.128/31	10.2.238.128 – 10.2.238.129	10.2.238.129
66	10.2.238.130/31	10.2.238.130 – 10.2.238.131	10.2.238.131
67	10.2.238.132/31	10.2.238.132 – 10.2.238.133	10.2.238.133
68	10.2.238.134/31	10.2.238.134 – 10.2.238.135	10.2.238.135
69	10.2.238.136/31	10.2.238.136 – 10.2.238.137	10.2.238.137
70	10.2.238.138/31	10.2.238.138 – 10.2.238.139	10.2.238.139
71	10.2.238.140/31	10.2.238.140 – 10.2.238.141	10.2.238.141
72	10.2.238.142/31	10.2.238.142 – 10.2.238.143	10.2.238.143
73	10.2.238.144/31	10.2.238.144 – 10.2.238.145	10.2.238.145
74	10.2.238.146/31	10.2.238.146 – 10.2.238.147	10.2.238.147
75	10.2.238.148/31	10.2.238.148 – 10.2.238.149	10.2.238.149
76	10.2.238.150/31	10.2.238.150 – 10.2.238.151	10.2.238.151
77	10.2.238.152/31	10.2.238.152 – 10.2.238.153	10.2.238.153
78	10.2.238.154/31	10.2.238.154 – 10.2.238.155	10.2.238.155
79	10.2.238.156/31	10.2.238.156 – 10.2.238.157	10.2.238.157
80	10.2.238.158/31	10.2.238.158 – 10.2.238.159	10.2.238.159
81	10.2.238.160/31	10.2.238.160 – 10.2.238.161	10.2.238.161
82	10.2.238.162/31	10.2.238.162 – 10.2.238.163	10.2.238.163
83	10.2.238.164/31	10.2.238.164 – 10.2.238.165	10.2.238.165
84	10.2.238.166/31	10.2.238.166 – 10.2.238.167	10.2.238.167
85	10.2.238.168/31	10.2.238.168 – 10.2.238.169	10.2.238.169
86	10.2.238.170/31	10.2.238.170 – 10.2.238.171	10.2.238.171
87	10.2.238.172/31	10.2.238.172 – 10.2.238.173	10.2.238.173
88	10.2.238.174/31	10.2.238.174 – 10.2.238.175	10.2.238.175
89	10.2.238.176/31	10.2.238.176 – 10.2.238.177	10.2.238.177
90	10.2.238.178/31	10.2.238.178 – 10.2.238.179	10.2.238.179
91	10.2.238.180/31	10.2.238.180 – 10.2.238.181	10.2.238.181
92	10.2.238.182/31	10.2.238.182 – 10.2.238.183	10.2.238.183
93	10.2.238.184/31	10.2.238.184 – 10.2.238.185	10.2.238.185
94	10.2.238.186/31	10.2.238.186 – 10.2.238.187	10.2.238.187
95	10.2.238.188/31	10.2.238.188 – 10.2.238.189	10.2.238.189
96	10.2.238.190/31	10.2.238.190 – 10.2.238.191	10.2.238.191
97	10.2.238.192/31	10.2.238.192 – 10.2.238.193	10.2.238.193
98	10.2.238.194/31	10.2.238.194 – 10.2.238.195	10.2.238.195
99	10.2.238.196/31	10.2.238.196 – 10.2.238.197	10.2.238.197
100	10.2.238.198/31	10.2.238.198 – 10.2.238.199	10.2.238.199
101	10.2.238.200/31	10.2.238.200 – 10.2.238.201	10.2.238.201
102	10.2.238.202/31	10.2.238.202 – 10.2.238.203	10.2.238.203
103	10.2.238.204/31	10.2.238.204 – 10.2.238.205	10.2.238.205
104	10.2.238.206/31	10.2.238.206 – 10.2.238.207	10.2.238.207
105	10.2.238.208/31	10.2.238.208 – 10.2.238.209	10.2.238.209
106	10.2.238.210/31	10.2.238.210 – 10.2.238.211	10.2.238.211
107	10.2.238.212/31	10.2.238.212 – 10.2.238.213	10.2.238.213
108	10.2.238.214/31	10.2.238.214 – 10.2.238.215	10.2.238.215
109	10.2.238.216/31	10.2.238.216 – 10.2.238.217	10.2.238.217
110	10.2.238.218/31	10.2.238.218 – 10.2.238.219	10.2.238.219
111	10.2.238.220/31	10.2.238.220 – 10.2.238.221	10.2.238.221
112	10.2.238.222/31	10.2.238.222 – 10.2.238.223	10.2.238.223
113	10.2.238.224/31	10.2.238.224 – 10.2.238.225	10.2.238.225
114	10.2.238.226/31	10.2.238.226 – 10.2.238.227	10.2.238.227
115	10.2.238.228/31	10.2.238.228 – 10.2.238.229	10.2.238.229
116	10.2.238.230/31	10.2.238.230 – 10.2.238.231	10.2.238.231
117	10.2.238.232/31	10.2.238.232 – 10.2.238.233	10.2.238.233
118	10.2.238.234/31	10.2.238.234 – 10.2.238.235	10.2.238.235
119	10.2.238.236/31	10.2.238.236 – 10.2.238.237	10.2.238.237
120	10.2.238.238/31	10.2.238.238 – 10.2.238.239	10.2.238.239
121	10.2.238.240/31	10.2.238.240 – 10.2.238.241	10.2.238.241
122	10.2.238.242/31	10.2.238.242 – 10.2.238.243	10.2.238.243
123	10.2.238.244/31	10.2.238.244 – 10.2.238.245	10.2.238.245
124	10.2.238.246/31	10.2.238.246 – 10.2.238.247	10.2.238.247
125	10.2.238.248/31	10.2.238.248 – 10.2.238.249	10.2.238.249
126	10.2.238.250/31	10.2.238.250 – 10.2.238.251	10.2.238.251
127	10.2.238.252/31	10.2.238.252 – 10.2.238.253	10.2.238.253
128	10.2.238.254/31	10.2.238.254 – 10.2.238.255	10.2.238.255

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 →