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)10.2.6.0/24

network10.2.6.0/24

broadcast10.2.6.255

first host10.2.6.1

last host10.2.6.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.6.0/24

address00001010.00000010.00000110.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.00000110.00000000

broadcast00001010.00000010.00000110.11111111

green = network part, grey = host part

hex0x0a020600

decimal167904768

reverse dns0.6.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:600

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.6.0/31	10.2.6.0 – 10.2.6.1	10.2.6.1
2	10.2.6.2/31	10.2.6.2 – 10.2.6.3	10.2.6.3
3	10.2.6.4/31	10.2.6.4 – 10.2.6.5	10.2.6.5
4	10.2.6.6/31	10.2.6.6 – 10.2.6.7	10.2.6.7
5	10.2.6.8/31	10.2.6.8 – 10.2.6.9	10.2.6.9
6	10.2.6.10/31	10.2.6.10 – 10.2.6.11	10.2.6.11
7	10.2.6.12/31	10.2.6.12 – 10.2.6.13	10.2.6.13
8	10.2.6.14/31	10.2.6.14 – 10.2.6.15	10.2.6.15
9	10.2.6.16/31	10.2.6.16 – 10.2.6.17	10.2.6.17
10	10.2.6.18/31	10.2.6.18 – 10.2.6.19	10.2.6.19
11	10.2.6.20/31	10.2.6.20 – 10.2.6.21	10.2.6.21
12	10.2.6.22/31	10.2.6.22 – 10.2.6.23	10.2.6.23
13	10.2.6.24/31	10.2.6.24 – 10.2.6.25	10.2.6.25
14	10.2.6.26/31	10.2.6.26 – 10.2.6.27	10.2.6.27
15	10.2.6.28/31	10.2.6.28 – 10.2.6.29	10.2.6.29
16	10.2.6.30/31	10.2.6.30 – 10.2.6.31	10.2.6.31
17	10.2.6.32/31	10.2.6.32 – 10.2.6.33	10.2.6.33
18	10.2.6.34/31	10.2.6.34 – 10.2.6.35	10.2.6.35
19	10.2.6.36/31	10.2.6.36 – 10.2.6.37	10.2.6.37
20	10.2.6.38/31	10.2.6.38 – 10.2.6.39	10.2.6.39
21	10.2.6.40/31	10.2.6.40 – 10.2.6.41	10.2.6.41
22	10.2.6.42/31	10.2.6.42 – 10.2.6.43	10.2.6.43
23	10.2.6.44/31	10.2.6.44 – 10.2.6.45	10.2.6.45
24	10.2.6.46/31	10.2.6.46 – 10.2.6.47	10.2.6.47
25	10.2.6.48/31	10.2.6.48 – 10.2.6.49	10.2.6.49
26	10.2.6.50/31	10.2.6.50 – 10.2.6.51	10.2.6.51
27	10.2.6.52/31	10.2.6.52 – 10.2.6.53	10.2.6.53
28	10.2.6.54/31	10.2.6.54 – 10.2.6.55	10.2.6.55
29	10.2.6.56/31	10.2.6.56 – 10.2.6.57	10.2.6.57
30	10.2.6.58/31	10.2.6.58 – 10.2.6.59	10.2.6.59
31	10.2.6.60/31	10.2.6.60 – 10.2.6.61	10.2.6.61
32	10.2.6.62/31	10.2.6.62 – 10.2.6.63	10.2.6.63
33	10.2.6.64/31	10.2.6.64 – 10.2.6.65	10.2.6.65
34	10.2.6.66/31	10.2.6.66 – 10.2.6.67	10.2.6.67
35	10.2.6.68/31	10.2.6.68 – 10.2.6.69	10.2.6.69
36	10.2.6.70/31	10.2.6.70 – 10.2.6.71	10.2.6.71
37	10.2.6.72/31	10.2.6.72 – 10.2.6.73	10.2.6.73
38	10.2.6.74/31	10.2.6.74 – 10.2.6.75	10.2.6.75
39	10.2.6.76/31	10.2.6.76 – 10.2.6.77	10.2.6.77
40	10.2.6.78/31	10.2.6.78 – 10.2.6.79	10.2.6.79
41	10.2.6.80/31	10.2.6.80 – 10.2.6.81	10.2.6.81
42	10.2.6.82/31	10.2.6.82 – 10.2.6.83	10.2.6.83
43	10.2.6.84/31	10.2.6.84 – 10.2.6.85	10.2.6.85
44	10.2.6.86/31	10.2.6.86 – 10.2.6.87	10.2.6.87
45	10.2.6.88/31	10.2.6.88 – 10.2.6.89	10.2.6.89
46	10.2.6.90/31	10.2.6.90 – 10.2.6.91	10.2.6.91
47	10.2.6.92/31	10.2.6.92 – 10.2.6.93	10.2.6.93
48	10.2.6.94/31	10.2.6.94 – 10.2.6.95	10.2.6.95
49	10.2.6.96/31	10.2.6.96 – 10.2.6.97	10.2.6.97
50	10.2.6.98/31	10.2.6.98 – 10.2.6.99	10.2.6.99
51	10.2.6.100/31	10.2.6.100 – 10.2.6.101	10.2.6.101
52	10.2.6.102/31	10.2.6.102 – 10.2.6.103	10.2.6.103
53	10.2.6.104/31	10.2.6.104 – 10.2.6.105	10.2.6.105
54	10.2.6.106/31	10.2.6.106 – 10.2.6.107	10.2.6.107
55	10.2.6.108/31	10.2.6.108 – 10.2.6.109	10.2.6.109
56	10.2.6.110/31	10.2.6.110 – 10.2.6.111	10.2.6.111
57	10.2.6.112/31	10.2.6.112 – 10.2.6.113	10.2.6.113
58	10.2.6.114/31	10.2.6.114 – 10.2.6.115	10.2.6.115
59	10.2.6.116/31	10.2.6.116 – 10.2.6.117	10.2.6.117
60	10.2.6.118/31	10.2.6.118 – 10.2.6.119	10.2.6.119
61	10.2.6.120/31	10.2.6.120 – 10.2.6.121	10.2.6.121
62	10.2.6.122/31	10.2.6.122 – 10.2.6.123	10.2.6.123
63	10.2.6.124/31	10.2.6.124 – 10.2.6.125	10.2.6.125
64	10.2.6.126/31	10.2.6.126 – 10.2.6.127	10.2.6.127
65	10.2.6.128/31	10.2.6.128 – 10.2.6.129	10.2.6.129
66	10.2.6.130/31	10.2.6.130 – 10.2.6.131	10.2.6.131
67	10.2.6.132/31	10.2.6.132 – 10.2.6.133	10.2.6.133
68	10.2.6.134/31	10.2.6.134 – 10.2.6.135	10.2.6.135
69	10.2.6.136/31	10.2.6.136 – 10.2.6.137	10.2.6.137
70	10.2.6.138/31	10.2.6.138 – 10.2.6.139	10.2.6.139
71	10.2.6.140/31	10.2.6.140 – 10.2.6.141	10.2.6.141
72	10.2.6.142/31	10.2.6.142 – 10.2.6.143	10.2.6.143
73	10.2.6.144/31	10.2.6.144 – 10.2.6.145	10.2.6.145
74	10.2.6.146/31	10.2.6.146 – 10.2.6.147	10.2.6.147
75	10.2.6.148/31	10.2.6.148 – 10.2.6.149	10.2.6.149
76	10.2.6.150/31	10.2.6.150 – 10.2.6.151	10.2.6.151
77	10.2.6.152/31	10.2.6.152 – 10.2.6.153	10.2.6.153
78	10.2.6.154/31	10.2.6.154 – 10.2.6.155	10.2.6.155
79	10.2.6.156/31	10.2.6.156 – 10.2.6.157	10.2.6.157
80	10.2.6.158/31	10.2.6.158 – 10.2.6.159	10.2.6.159
81	10.2.6.160/31	10.2.6.160 – 10.2.6.161	10.2.6.161
82	10.2.6.162/31	10.2.6.162 – 10.2.6.163	10.2.6.163
83	10.2.6.164/31	10.2.6.164 – 10.2.6.165	10.2.6.165
84	10.2.6.166/31	10.2.6.166 – 10.2.6.167	10.2.6.167
85	10.2.6.168/31	10.2.6.168 – 10.2.6.169	10.2.6.169
86	10.2.6.170/31	10.2.6.170 – 10.2.6.171	10.2.6.171
87	10.2.6.172/31	10.2.6.172 – 10.2.6.173	10.2.6.173
88	10.2.6.174/31	10.2.6.174 – 10.2.6.175	10.2.6.175
89	10.2.6.176/31	10.2.6.176 – 10.2.6.177	10.2.6.177
90	10.2.6.178/31	10.2.6.178 – 10.2.6.179	10.2.6.179
91	10.2.6.180/31	10.2.6.180 – 10.2.6.181	10.2.6.181
92	10.2.6.182/31	10.2.6.182 – 10.2.6.183	10.2.6.183
93	10.2.6.184/31	10.2.6.184 – 10.2.6.185	10.2.6.185
94	10.2.6.186/31	10.2.6.186 – 10.2.6.187	10.2.6.187
95	10.2.6.188/31	10.2.6.188 – 10.2.6.189	10.2.6.189
96	10.2.6.190/31	10.2.6.190 – 10.2.6.191	10.2.6.191
97	10.2.6.192/31	10.2.6.192 – 10.2.6.193	10.2.6.193
98	10.2.6.194/31	10.2.6.194 – 10.2.6.195	10.2.6.195
99	10.2.6.196/31	10.2.6.196 – 10.2.6.197	10.2.6.197
100	10.2.6.198/31	10.2.6.198 – 10.2.6.199	10.2.6.199
101	10.2.6.200/31	10.2.6.200 – 10.2.6.201	10.2.6.201
102	10.2.6.202/31	10.2.6.202 – 10.2.6.203	10.2.6.203
103	10.2.6.204/31	10.2.6.204 – 10.2.6.205	10.2.6.205
104	10.2.6.206/31	10.2.6.206 – 10.2.6.207	10.2.6.207
105	10.2.6.208/31	10.2.6.208 – 10.2.6.209	10.2.6.209
106	10.2.6.210/31	10.2.6.210 – 10.2.6.211	10.2.6.211
107	10.2.6.212/31	10.2.6.212 – 10.2.6.213	10.2.6.213
108	10.2.6.214/31	10.2.6.214 – 10.2.6.215	10.2.6.215
109	10.2.6.216/31	10.2.6.216 – 10.2.6.217	10.2.6.217
110	10.2.6.218/31	10.2.6.218 – 10.2.6.219	10.2.6.219
111	10.2.6.220/31	10.2.6.220 – 10.2.6.221	10.2.6.221
112	10.2.6.222/31	10.2.6.222 – 10.2.6.223	10.2.6.223
113	10.2.6.224/31	10.2.6.224 – 10.2.6.225	10.2.6.225
114	10.2.6.226/31	10.2.6.226 – 10.2.6.227	10.2.6.227
115	10.2.6.228/31	10.2.6.228 – 10.2.6.229	10.2.6.229
116	10.2.6.230/31	10.2.6.230 – 10.2.6.231	10.2.6.231
117	10.2.6.232/31	10.2.6.232 – 10.2.6.233	10.2.6.233
118	10.2.6.234/31	10.2.6.234 – 10.2.6.235	10.2.6.235
119	10.2.6.236/31	10.2.6.236 – 10.2.6.237	10.2.6.237
120	10.2.6.238/31	10.2.6.238 – 10.2.6.239	10.2.6.239
121	10.2.6.240/31	10.2.6.240 – 10.2.6.241	10.2.6.241
122	10.2.6.242/31	10.2.6.242 – 10.2.6.243	10.2.6.243
123	10.2.6.244/31	10.2.6.244 – 10.2.6.245	10.2.6.245
124	10.2.6.246/31	10.2.6.246 – 10.2.6.247	10.2.6.247
125	10.2.6.248/31	10.2.6.248 – 10.2.6.249	10.2.6.249
126	10.2.6.250/31	10.2.6.250 – 10.2.6.251	10.2.6.251
127	10.2.6.252/31	10.2.6.252 – 10.2.6.253	10.2.6.253
128	10.2.6.254/31	10.2.6.254 – 10.2.6.255	10.2.6.255

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 →