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)10.2.68.0/24

network10.2.68.0/24

broadcast10.2.68.255

first host10.2.68.1

last host10.2.68.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.68.0/24

address00001010.00000010.01000100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.01000100.00000000

broadcast00001010.00000010.01000100.11111111

green = network part, grey = host part

hex0x0a024400

decimal167920640

reverse dns0.68.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:4400

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.68.0/31	10.2.68.0 – 10.2.68.1	10.2.68.1
2	10.2.68.2/31	10.2.68.2 – 10.2.68.3	10.2.68.3
3	10.2.68.4/31	10.2.68.4 – 10.2.68.5	10.2.68.5
4	10.2.68.6/31	10.2.68.6 – 10.2.68.7	10.2.68.7
5	10.2.68.8/31	10.2.68.8 – 10.2.68.9	10.2.68.9
6	10.2.68.10/31	10.2.68.10 – 10.2.68.11	10.2.68.11
7	10.2.68.12/31	10.2.68.12 – 10.2.68.13	10.2.68.13
8	10.2.68.14/31	10.2.68.14 – 10.2.68.15	10.2.68.15
9	10.2.68.16/31	10.2.68.16 – 10.2.68.17	10.2.68.17
10	10.2.68.18/31	10.2.68.18 – 10.2.68.19	10.2.68.19
11	10.2.68.20/31	10.2.68.20 – 10.2.68.21	10.2.68.21
12	10.2.68.22/31	10.2.68.22 – 10.2.68.23	10.2.68.23
13	10.2.68.24/31	10.2.68.24 – 10.2.68.25	10.2.68.25
14	10.2.68.26/31	10.2.68.26 – 10.2.68.27	10.2.68.27
15	10.2.68.28/31	10.2.68.28 – 10.2.68.29	10.2.68.29
16	10.2.68.30/31	10.2.68.30 – 10.2.68.31	10.2.68.31
17	10.2.68.32/31	10.2.68.32 – 10.2.68.33	10.2.68.33
18	10.2.68.34/31	10.2.68.34 – 10.2.68.35	10.2.68.35
19	10.2.68.36/31	10.2.68.36 – 10.2.68.37	10.2.68.37
20	10.2.68.38/31	10.2.68.38 – 10.2.68.39	10.2.68.39
21	10.2.68.40/31	10.2.68.40 – 10.2.68.41	10.2.68.41
22	10.2.68.42/31	10.2.68.42 – 10.2.68.43	10.2.68.43
23	10.2.68.44/31	10.2.68.44 – 10.2.68.45	10.2.68.45
24	10.2.68.46/31	10.2.68.46 – 10.2.68.47	10.2.68.47
25	10.2.68.48/31	10.2.68.48 – 10.2.68.49	10.2.68.49
26	10.2.68.50/31	10.2.68.50 – 10.2.68.51	10.2.68.51
27	10.2.68.52/31	10.2.68.52 – 10.2.68.53	10.2.68.53
28	10.2.68.54/31	10.2.68.54 – 10.2.68.55	10.2.68.55
29	10.2.68.56/31	10.2.68.56 – 10.2.68.57	10.2.68.57
30	10.2.68.58/31	10.2.68.58 – 10.2.68.59	10.2.68.59
31	10.2.68.60/31	10.2.68.60 – 10.2.68.61	10.2.68.61
32	10.2.68.62/31	10.2.68.62 – 10.2.68.63	10.2.68.63
33	10.2.68.64/31	10.2.68.64 – 10.2.68.65	10.2.68.65
34	10.2.68.66/31	10.2.68.66 – 10.2.68.67	10.2.68.67
35	10.2.68.68/31	10.2.68.68 – 10.2.68.69	10.2.68.69
36	10.2.68.70/31	10.2.68.70 – 10.2.68.71	10.2.68.71
37	10.2.68.72/31	10.2.68.72 – 10.2.68.73	10.2.68.73
38	10.2.68.74/31	10.2.68.74 – 10.2.68.75	10.2.68.75
39	10.2.68.76/31	10.2.68.76 – 10.2.68.77	10.2.68.77
40	10.2.68.78/31	10.2.68.78 – 10.2.68.79	10.2.68.79
41	10.2.68.80/31	10.2.68.80 – 10.2.68.81	10.2.68.81
42	10.2.68.82/31	10.2.68.82 – 10.2.68.83	10.2.68.83
43	10.2.68.84/31	10.2.68.84 – 10.2.68.85	10.2.68.85
44	10.2.68.86/31	10.2.68.86 – 10.2.68.87	10.2.68.87
45	10.2.68.88/31	10.2.68.88 – 10.2.68.89	10.2.68.89
46	10.2.68.90/31	10.2.68.90 – 10.2.68.91	10.2.68.91
47	10.2.68.92/31	10.2.68.92 – 10.2.68.93	10.2.68.93
48	10.2.68.94/31	10.2.68.94 – 10.2.68.95	10.2.68.95
49	10.2.68.96/31	10.2.68.96 – 10.2.68.97	10.2.68.97
50	10.2.68.98/31	10.2.68.98 – 10.2.68.99	10.2.68.99
51	10.2.68.100/31	10.2.68.100 – 10.2.68.101	10.2.68.101
52	10.2.68.102/31	10.2.68.102 – 10.2.68.103	10.2.68.103
53	10.2.68.104/31	10.2.68.104 – 10.2.68.105	10.2.68.105
54	10.2.68.106/31	10.2.68.106 – 10.2.68.107	10.2.68.107
55	10.2.68.108/31	10.2.68.108 – 10.2.68.109	10.2.68.109
56	10.2.68.110/31	10.2.68.110 – 10.2.68.111	10.2.68.111
57	10.2.68.112/31	10.2.68.112 – 10.2.68.113	10.2.68.113
58	10.2.68.114/31	10.2.68.114 – 10.2.68.115	10.2.68.115
59	10.2.68.116/31	10.2.68.116 – 10.2.68.117	10.2.68.117
60	10.2.68.118/31	10.2.68.118 – 10.2.68.119	10.2.68.119
61	10.2.68.120/31	10.2.68.120 – 10.2.68.121	10.2.68.121
62	10.2.68.122/31	10.2.68.122 – 10.2.68.123	10.2.68.123
63	10.2.68.124/31	10.2.68.124 – 10.2.68.125	10.2.68.125
64	10.2.68.126/31	10.2.68.126 – 10.2.68.127	10.2.68.127
65	10.2.68.128/31	10.2.68.128 – 10.2.68.129	10.2.68.129
66	10.2.68.130/31	10.2.68.130 – 10.2.68.131	10.2.68.131
67	10.2.68.132/31	10.2.68.132 – 10.2.68.133	10.2.68.133
68	10.2.68.134/31	10.2.68.134 – 10.2.68.135	10.2.68.135
69	10.2.68.136/31	10.2.68.136 – 10.2.68.137	10.2.68.137
70	10.2.68.138/31	10.2.68.138 – 10.2.68.139	10.2.68.139
71	10.2.68.140/31	10.2.68.140 – 10.2.68.141	10.2.68.141
72	10.2.68.142/31	10.2.68.142 – 10.2.68.143	10.2.68.143
73	10.2.68.144/31	10.2.68.144 – 10.2.68.145	10.2.68.145
74	10.2.68.146/31	10.2.68.146 – 10.2.68.147	10.2.68.147
75	10.2.68.148/31	10.2.68.148 – 10.2.68.149	10.2.68.149
76	10.2.68.150/31	10.2.68.150 – 10.2.68.151	10.2.68.151
77	10.2.68.152/31	10.2.68.152 – 10.2.68.153	10.2.68.153
78	10.2.68.154/31	10.2.68.154 – 10.2.68.155	10.2.68.155
79	10.2.68.156/31	10.2.68.156 – 10.2.68.157	10.2.68.157
80	10.2.68.158/31	10.2.68.158 – 10.2.68.159	10.2.68.159
81	10.2.68.160/31	10.2.68.160 – 10.2.68.161	10.2.68.161
82	10.2.68.162/31	10.2.68.162 – 10.2.68.163	10.2.68.163
83	10.2.68.164/31	10.2.68.164 – 10.2.68.165	10.2.68.165
84	10.2.68.166/31	10.2.68.166 – 10.2.68.167	10.2.68.167
85	10.2.68.168/31	10.2.68.168 – 10.2.68.169	10.2.68.169
86	10.2.68.170/31	10.2.68.170 – 10.2.68.171	10.2.68.171
87	10.2.68.172/31	10.2.68.172 – 10.2.68.173	10.2.68.173
88	10.2.68.174/31	10.2.68.174 – 10.2.68.175	10.2.68.175
89	10.2.68.176/31	10.2.68.176 – 10.2.68.177	10.2.68.177
90	10.2.68.178/31	10.2.68.178 – 10.2.68.179	10.2.68.179
91	10.2.68.180/31	10.2.68.180 – 10.2.68.181	10.2.68.181
92	10.2.68.182/31	10.2.68.182 – 10.2.68.183	10.2.68.183
93	10.2.68.184/31	10.2.68.184 – 10.2.68.185	10.2.68.185
94	10.2.68.186/31	10.2.68.186 – 10.2.68.187	10.2.68.187
95	10.2.68.188/31	10.2.68.188 – 10.2.68.189	10.2.68.189
96	10.2.68.190/31	10.2.68.190 – 10.2.68.191	10.2.68.191
97	10.2.68.192/31	10.2.68.192 – 10.2.68.193	10.2.68.193
98	10.2.68.194/31	10.2.68.194 – 10.2.68.195	10.2.68.195
99	10.2.68.196/31	10.2.68.196 – 10.2.68.197	10.2.68.197
100	10.2.68.198/31	10.2.68.198 – 10.2.68.199	10.2.68.199
101	10.2.68.200/31	10.2.68.200 – 10.2.68.201	10.2.68.201
102	10.2.68.202/31	10.2.68.202 – 10.2.68.203	10.2.68.203
103	10.2.68.204/31	10.2.68.204 – 10.2.68.205	10.2.68.205
104	10.2.68.206/31	10.2.68.206 – 10.2.68.207	10.2.68.207
105	10.2.68.208/31	10.2.68.208 – 10.2.68.209	10.2.68.209
106	10.2.68.210/31	10.2.68.210 – 10.2.68.211	10.2.68.211
107	10.2.68.212/31	10.2.68.212 – 10.2.68.213	10.2.68.213
108	10.2.68.214/31	10.2.68.214 – 10.2.68.215	10.2.68.215
109	10.2.68.216/31	10.2.68.216 – 10.2.68.217	10.2.68.217
110	10.2.68.218/31	10.2.68.218 – 10.2.68.219	10.2.68.219
111	10.2.68.220/31	10.2.68.220 – 10.2.68.221	10.2.68.221
112	10.2.68.222/31	10.2.68.222 – 10.2.68.223	10.2.68.223
113	10.2.68.224/31	10.2.68.224 – 10.2.68.225	10.2.68.225
114	10.2.68.226/31	10.2.68.226 – 10.2.68.227	10.2.68.227
115	10.2.68.228/31	10.2.68.228 – 10.2.68.229	10.2.68.229
116	10.2.68.230/31	10.2.68.230 – 10.2.68.231	10.2.68.231
117	10.2.68.232/31	10.2.68.232 – 10.2.68.233	10.2.68.233
118	10.2.68.234/31	10.2.68.234 – 10.2.68.235	10.2.68.235
119	10.2.68.236/31	10.2.68.236 – 10.2.68.237	10.2.68.237
120	10.2.68.238/31	10.2.68.238 – 10.2.68.239	10.2.68.239
121	10.2.68.240/31	10.2.68.240 – 10.2.68.241	10.2.68.241
122	10.2.68.242/31	10.2.68.242 – 10.2.68.243	10.2.68.243
123	10.2.68.244/31	10.2.68.244 – 10.2.68.245	10.2.68.245
124	10.2.68.246/31	10.2.68.246 – 10.2.68.247	10.2.68.247
125	10.2.68.248/31	10.2.68.248 – 10.2.68.249	10.2.68.249
126	10.2.68.250/31	10.2.68.250 – 10.2.68.251	10.2.68.251
127	10.2.68.252/31	10.2.68.252 – 10.2.68.253	10.2.68.253
128	10.2.68.254/31	10.2.68.254 – 10.2.68.255	10.2.68.255

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 →