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)10.0.242.0/24

network10.0.242.0/24

broadcast10.0.242.255

first host10.0.242.1

last host10.0.242.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.242.0/24

address00001010.00000000.11110010.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.11110010.00000000

broadcast00001010.00000000.11110010.11111111

green = network part, grey = host part

hex0x0a00f200

decimal167834112

reverse dns0.242.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:f200

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.242.0/31	10.0.242.0 – 10.0.242.1	10.0.242.1
2	10.0.242.2/31	10.0.242.2 – 10.0.242.3	10.0.242.3
3	10.0.242.4/31	10.0.242.4 – 10.0.242.5	10.0.242.5
4	10.0.242.6/31	10.0.242.6 – 10.0.242.7	10.0.242.7
5	10.0.242.8/31	10.0.242.8 – 10.0.242.9	10.0.242.9
6	10.0.242.10/31	10.0.242.10 – 10.0.242.11	10.0.242.11
7	10.0.242.12/31	10.0.242.12 – 10.0.242.13	10.0.242.13
8	10.0.242.14/31	10.0.242.14 – 10.0.242.15	10.0.242.15
9	10.0.242.16/31	10.0.242.16 – 10.0.242.17	10.0.242.17
10	10.0.242.18/31	10.0.242.18 – 10.0.242.19	10.0.242.19
11	10.0.242.20/31	10.0.242.20 – 10.0.242.21	10.0.242.21
12	10.0.242.22/31	10.0.242.22 – 10.0.242.23	10.0.242.23
13	10.0.242.24/31	10.0.242.24 – 10.0.242.25	10.0.242.25
14	10.0.242.26/31	10.0.242.26 – 10.0.242.27	10.0.242.27
15	10.0.242.28/31	10.0.242.28 – 10.0.242.29	10.0.242.29
16	10.0.242.30/31	10.0.242.30 – 10.0.242.31	10.0.242.31
17	10.0.242.32/31	10.0.242.32 – 10.0.242.33	10.0.242.33
18	10.0.242.34/31	10.0.242.34 – 10.0.242.35	10.0.242.35
19	10.0.242.36/31	10.0.242.36 – 10.0.242.37	10.0.242.37
20	10.0.242.38/31	10.0.242.38 – 10.0.242.39	10.0.242.39
21	10.0.242.40/31	10.0.242.40 – 10.0.242.41	10.0.242.41
22	10.0.242.42/31	10.0.242.42 – 10.0.242.43	10.0.242.43
23	10.0.242.44/31	10.0.242.44 – 10.0.242.45	10.0.242.45
24	10.0.242.46/31	10.0.242.46 – 10.0.242.47	10.0.242.47
25	10.0.242.48/31	10.0.242.48 – 10.0.242.49	10.0.242.49
26	10.0.242.50/31	10.0.242.50 – 10.0.242.51	10.0.242.51
27	10.0.242.52/31	10.0.242.52 – 10.0.242.53	10.0.242.53
28	10.0.242.54/31	10.0.242.54 – 10.0.242.55	10.0.242.55
29	10.0.242.56/31	10.0.242.56 – 10.0.242.57	10.0.242.57
30	10.0.242.58/31	10.0.242.58 – 10.0.242.59	10.0.242.59
31	10.0.242.60/31	10.0.242.60 – 10.0.242.61	10.0.242.61
32	10.0.242.62/31	10.0.242.62 – 10.0.242.63	10.0.242.63
33	10.0.242.64/31	10.0.242.64 – 10.0.242.65	10.0.242.65
34	10.0.242.66/31	10.0.242.66 – 10.0.242.67	10.0.242.67
35	10.0.242.68/31	10.0.242.68 – 10.0.242.69	10.0.242.69
36	10.0.242.70/31	10.0.242.70 – 10.0.242.71	10.0.242.71
37	10.0.242.72/31	10.0.242.72 – 10.0.242.73	10.0.242.73
38	10.0.242.74/31	10.0.242.74 – 10.0.242.75	10.0.242.75
39	10.0.242.76/31	10.0.242.76 – 10.0.242.77	10.0.242.77
40	10.0.242.78/31	10.0.242.78 – 10.0.242.79	10.0.242.79
41	10.0.242.80/31	10.0.242.80 – 10.0.242.81	10.0.242.81
42	10.0.242.82/31	10.0.242.82 – 10.0.242.83	10.0.242.83
43	10.0.242.84/31	10.0.242.84 – 10.0.242.85	10.0.242.85
44	10.0.242.86/31	10.0.242.86 – 10.0.242.87	10.0.242.87
45	10.0.242.88/31	10.0.242.88 – 10.0.242.89	10.0.242.89
46	10.0.242.90/31	10.0.242.90 – 10.0.242.91	10.0.242.91
47	10.0.242.92/31	10.0.242.92 – 10.0.242.93	10.0.242.93
48	10.0.242.94/31	10.0.242.94 – 10.0.242.95	10.0.242.95
49	10.0.242.96/31	10.0.242.96 – 10.0.242.97	10.0.242.97
50	10.0.242.98/31	10.0.242.98 – 10.0.242.99	10.0.242.99
51	10.0.242.100/31	10.0.242.100 – 10.0.242.101	10.0.242.101
52	10.0.242.102/31	10.0.242.102 – 10.0.242.103	10.0.242.103
53	10.0.242.104/31	10.0.242.104 – 10.0.242.105	10.0.242.105
54	10.0.242.106/31	10.0.242.106 – 10.0.242.107	10.0.242.107
55	10.0.242.108/31	10.0.242.108 – 10.0.242.109	10.0.242.109
56	10.0.242.110/31	10.0.242.110 – 10.0.242.111	10.0.242.111
57	10.0.242.112/31	10.0.242.112 – 10.0.242.113	10.0.242.113
58	10.0.242.114/31	10.0.242.114 – 10.0.242.115	10.0.242.115
59	10.0.242.116/31	10.0.242.116 – 10.0.242.117	10.0.242.117
60	10.0.242.118/31	10.0.242.118 – 10.0.242.119	10.0.242.119
61	10.0.242.120/31	10.0.242.120 – 10.0.242.121	10.0.242.121
62	10.0.242.122/31	10.0.242.122 – 10.0.242.123	10.0.242.123
63	10.0.242.124/31	10.0.242.124 – 10.0.242.125	10.0.242.125
64	10.0.242.126/31	10.0.242.126 – 10.0.242.127	10.0.242.127
65	10.0.242.128/31	10.0.242.128 – 10.0.242.129	10.0.242.129
66	10.0.242.130/31	10.0.242.130 – 10.0.242.131	10.0.242.131
67	10.0.242.132/31	10.0.242.132 – 10.0.242.133	10.0.242.133
68	10.0.242.134/31	10.0.242.134 – 10.0.242.135	10.0.242.135
69	10.0.242.136/31	10.0.242.136 – 10.0.242.137	10.0.242.137
70	10.0.242.138/31	10.0.242.138 – 10.0.242.139	10.0.242.139
71	10.0.242.140/31	10.0.242.140 – 10.0.242.141	10.0.242.141
72	10.0.242.142/31	10.0.242.142 – 10.0.242.143	10.0.242.143
73	10.0.242.144/31	10.0.242.144 – 10.0.242.145	10.0.242.145
74	10.0.242.146/31	10.0.242.146 – 10.0.242.147	10.0.242.147
75	10.0.242.148/31	10.0.242.148 – 10.0.242.149	10.0.242.149
76	10.0.242.150/31	10.0.242.150 – 10.0.242.151	10.0.242.151
77	10.0.242.152/31	10.0.242.152 – 10.0.242.153	10.0.242.153
78	10.0.242.154/31	10.0.242.154 – 10.0.242.155	10.0.242.155
79	10.0.242.156/31	10.0.242.156 – 10.0.242.157	10.0.242.157
80	10.0.242.158/31	10.0.242.158 – 10.0.242.159	10.0.242.159
81	10.0.242.160/31	10.0.242.160 – 10.0.242.161	10.0.242.161
82	10.0.242.162/31	10.0.242.162 – 10.0.242.163	10.0.242.163
83	10.0.242.164/31	10.0.242.164 – 10.0.242.165	10.0.242.165
84	10.0.242.166/31	10.0.242.166 – 10.0.242.167	10.0.242.167
85	10.0.242.168/31	10.0.242.168 – 10.0.242.169	10.0.242.169
86	10.0.242.170/31	10.0.242.170 – 10.0.242.171	10.0.242.171
87	10.0.242.172/31	10.0.242.172 – 10.0.242.173	10.0.242.173
88	10.0.242.174/31	10.0.242.174 – 10.0.242.175	10.0.242.175
89	10.0.242.176/31	10.0.242.176 – 10.0.242.177	10.0.242.177
90	10.0.242.178/31	10.0.242.178 – 10.0.242.179	10.0.242.179
91	10.0.242.180/31	10.0.242.180 – 10.0.242.181	10.0.242.181
92	10.0.242.182/31	10.0.242.182 – 10.0.242.183	10.0.242.183
93	10.0.242.184/31	10.0.242.184 – 10.0.242.185	10.0.242.185
94	10.0.242.186/31	10.0.242.186 – 10.0.242.187	10.0.242.187
95	10.0.242.188/31	10.0.242.188 – 10.0.242.189	10.0.242.189
96	10.0.242.190/31	10.0.242.190 – 10.0.242.191	10.0.242.191
97	10.0.242.192/31	10.0.242.192 – 10.0.242.193	10.0.242.193
98	10.0.242.194/31	10.0.242.194 – 10.0.242.195	10.0.242.195
99	10.0.242.196/31	10.0.242.196 – 10.0.242.197	10.0.242.197
100	10.0.242.198/31	10.0.242.198 – 10.0.242.199	10.0.242.199
101	10.0.242.200/31	10.0.242.200 – 10.0.242.201	10.0.242.201
102	10.0.242.202/31	10.0.242.202 – 10.0.242.203	10.0.242.203
103	10.0.242.204/31	10.0.242.204 – 10.0.242.205	10.0.242.205
104	10.0.242.206/31	10.0.242.206 – 10.0.242.207	10.0.242.207
105	10.0.242.208/31	10.0.242.208 – 10.0.242.209	10.0.242.209
106	10.0.242.210/31	10.0.242.210 – 10.0.242.211	10.0.242.211
107	10.0.242.212/31	10.0.242.212 – 10.0.242.213	10.0.242.213
108	10.0.242.214/31	10.0.242.214 – 10.0.242.215	10.0.242.215
109	10.0.242.216/31	10.0.242.216 – 10.0.242.217	10.0.242.217
110	10.0.242.218/31	10.0.242.218 – 10.0.242.219	10.0.242.219
111	10.0.242.220/31	10.0.242.220 – 10.0.242.221	10.0.242.221
112	10.0.242.222/31	10.0.242.222 – 10.0.242.223	10.0.242.223
113	10.0.242.224/31	10.0.242.224 – 10.0.242.225	10.0.242.225
114	10.0.242.226/31	10.0.242.226 – 10.0.242.227	10.0.242.227
115	10.0.242.228/31	10.0.242.228 – 10.0.242.229	10.0.242.229
116	10.0.242.230/31	10.0.242.230 – 10.0.242.231	10.0.242.231
117	10.0.242.232/31	10.0.242.232 – 10.0.242.233	10.0.242.233
118	10.0.242.234/31	10.0.242.234 – 10.0.242.235	10.0.242.235
119	10.0.242.236/31	10.0.242.236 – 10.0.242.237	10.0.242.237
120	10.0.242.238/31	10.0.242.238 – 10.0.242.239	10.0.242.239
121	10.0.242.240/31	10.0.242.240 – 10.0.242.241	10.0.242.241
122	10.0.242.242/31	10.0.242.242 – 10.0.242.243	10.0.242.243
123	10.0.242.244/31	10.0.242.244 – 10.0.242.245	10.0.242.245
124	10.0.242.246/31	10.0.242.246 – 10.0.242.247	10.0.242.247
125	10.0.242.248/31	10.0.242.248 – 10.0.242.249	10.0.242.249
126	10.0.242.250/31	10.0.242.250 – 10.0.242.251	10.0.242.251
127	10.0.242.252/31	10.0.242.252 – 10.0.242.253	10.0.242.253
128	10.0.242.254/31	10.0.242.254 – 10.0.242.255	10.0.242.255

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 →