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)10.2.209.0/24

network10.2.209.0/24

broadcast10.2.209.255

first host10.2.209.1

last host10.2.209.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.209.0/24

address00001010.00000010.11010001.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.11010001.00000000

broadcast00001010.00000010.11010001.11111111

green = network part, grey = host part

hex0x0a02d100

decimal167956736

reverse dns0.209.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:d100

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.209.0/31	10.2.209.0 – 10.2.209.1	10.2.209.1
2	10.2.209.2/31	10.2.209.2 – 10.2.209.3	10.2.209.3
3	10.2.209.4/31	10.2.209.4 – 10.2.209.5	10.2.209.5
4	10.2.209.6/31	10.2.209.6 – 10.2.209.7	10.2.209.7
5	10.2.209.8/31	10.2.209.8 – 10.2.209.9	10.2.209.9
6	10.2.209.10/31	10.2.209.10 – 10.2.209.11	10.2.209.11
7	10.2.209.12/31	10.2.209.12 – 10.2.209.13	10.2.209.13
8	10.2.209.14/31	10.2.209.14 – 10.2.209.15	10.2.209.15
9	10.2.209.16/31	10.2.209.16 – 10.2.209.17	10.2.209.17
10	10.2.209.18/31	10.2.209.18 – 10.2.209.19	10.2.209.19
11	10.2.209.20/31	10.2.209.20 – 10.2.209.21	10.2.209.21
12	10.2.209.22/31	10.2.209.22 – 10.2.209.23	10.2.209.23
13	10.2.209.24/31	10.2.209.24 – 10.2.209.25	10.2.209.25
14	10.2.209.26/31	10.2.209.26 – 10.2.209.27	10.2.209.27
15	10.2.209.28/31	10.2.209.28 – 10.2.209.29	10.2.209.29
16	10.2.209.30/31	10.2.209.30 – 10.2.209.31	10.2.209.31
17	10.2.209.32/31	10.2.209.32 – 10.2.209.33	10.2.209.33
18	10.2.209.34/31	10.2.209.34 – 10.2.209.35	10.2.209.35
19	10.2.209.36/31	10.2.209.36 – 10.2.209.37	10.2.209.37
20	10.2.209.38/31	10.2.209.38 – 10.2.209.39	10.2.209.39
21	10.2.209.40/31	10.2.209.40 – 10.2.209.41	10.2.209.41
22	10.2.209.42/31	10.2.209.42 – 10.2.209.43	10.2.209.43
23	10.2.209.44/31	10.2.209.44 – 10.2.209.45	10.2.209.45
24	10.2.209.46/31	10.2.209.46 – 10.2.209.47	10.2.209.47
25	10.2.209.48/31	10.2.209.48 – 10.2.209.49	10.2.209.49
26	10.2.209.50/31	10.2.209.50 – 10.2.209.51	10.2.209.51
27	10.2.209.52/31	10.2.209.52 – 10.2.209.53	10.2.209.53
28	10.2.209.54/31	10.2.209.54 – 10.2.209.55	10.2.209.55
29	10.2.209.56/31	10.2.209.56 – 10.2.209.57	10.2.209.57
30	10.2.209.58/31	10.2.209.58 – 10.2.209.59	10.2.209.59
31	10.2.209.60/31	10.2.209.60 – 10.2.209.61	10.2.209.61
32	10.2.209.62/31	10.2.209.62 – 10.2.209.63	10.2.209.63
33	10.2.209.64/31	10.2.209.64 – 10.2.209.65	10.2.209.65
34	10.2.209.66/31	10.2.209.66 – 10.2.209.67	10.2.209.67
35	10.2.209.68/31	10.2.209.68 – 10.2.209.69	10.2.209.69
36	10.2.209.70/31	10.2.209.70 – 10.2.209.71	10.2.209.71
37	10.2.209.72/31	10.2.209.72 – 10.2.209.73	10.2.209.73
38	10.2.209.74/31	10.2.209.74 – 10.2.209.75	10.2.209.75
39	10.2.209.76/31	10.2.209.76 – 10.2.209.77	10.2.209.77
40	10.2.209.78/31	10.2.209.78 – 10.2.209.79	10.2.209.79
41	10.2.209.80/31	10.2.209.80 – 10.2.209.81	10.2.209.81
42	10.2.209.82/31	10.2.209.82 – 10.2.209.83	10.2.209.83
43	10.2.209.84/31	10.2.209.84 – 10.2.209.85	10.2.209.85
44	10.2.209.86/31	10.2.209.86 – 10.2.209.87	10.2.209.87
45	10.2.209.88/31	10.2.209.88 – 10.2.209.89	10.2.209.89
46	10.2.209.90/31	10.2.209.90 – 10.2.209.91	10.2.209.91
47	10.2.209.92/31	10.2.209.92 – 10.2.209.93	10.2.209.93
48	10.2.209.94/31	10.2.209.94 – 10.2.209.95	10.2.209.95
49	10.2.209.96/31	10.2.209.96 – 10.2.209.97	10.2.209.97
50	10.2.209.98/31	10.2.209.98 – 10.2.209.99	10.2.209.99
51	10.2.209.100/31	10.2.209.100 – 10.2.209.101	10.2.209.101
52	10.2.209.102/31	10.2.209.102 – 10.2.209.103	10.2.209.103
53	10.2.209.104/31	10.2.209.104 – 10.2.209.105	10.2.209.105
54	10.2.209.106/31	10.2.209.106 – 10.2.209.107	10.2.209.107
55	10.2.209.108/31	10.2.209.108 – 10.2.209.109	10.2.209.109
56	10.2.209.110/31	10.2.209.110 – 10.2.209.111	10.2.209.111
57	10.2.209.112/31	10.2.209.112 – 10.2.209.113	10.2.209.113
58	10.2.209.114/31	10.2.209.114 – 10.2.209.115	10.2.209.115
59	10.2.209.116/31	10.2.209.116 – 10.2.209.117	10.2.209.117
60	10.2.209.118/31	10.2.209.118 – 10.2.209.119	10.2.209.119
61	10.2.209.120/31	10.2.209.120 – 10.2.209.121	10.2.209.121
62	10.2.209.122/31	10.2.209.122 – 10.2.209.123	10.2.209.123
63	10.2.209.124/31	10.2.209.124 – 10.2.209.125	10.2.209.125
64	10.2.209.126/31	10.2.209.126 – 10.2.209.127	10.2.209.127
65	10.2.209.128/31	10.2.209.128 – 10.2.209.129	10.2.209.129
66	10.2.209.130/31	10.2.209.130 – 10.2.209.131	10.2.209.131
67	10.2.209.132/31	10.2.209.132 – 10.2.209.133	10.2.209.133
68	10.2.209.134/31	10.2.209.134 – 10.2.209.135	10.2.209.135
69	10.2.209.136/31	10.2.209.136 – 10.2.209.137	10.2.209.137
70	10.2.209.138/31	10.2.209.138 – 10.2.209.139	10.2.209.139
71	10.2.209.140/31	10.2.209.140 – 10.2.209.141	10.2.209.141
72	10.2.209.142/31	10.2.209.142 – 10.2.209.143	10.2.209.143
73	10.2.209.144/31	10.2.209.144 – 10.2.209.145	10.2.209.145
74	10.2.209.146/31	10.2.209.146 – 10.2.209.147	10.2.209.147
75	10.2.209.148/31	10.2.209.148 – 10.2.209.149	10.2.209.149
76	10.2.209.150/31	10.2.209.150 – 10.2.209.151	10.2.209.151
77	10.2.209.152/31	10.2.209.152 – 10.2.209.153	10.2.209.153
78	10.2.209.154/31	10.2.209.154 – 10.2.209.155	10.2.209.155
79	10.2.209.156/31	10.2.209.156 – 10.2.209.157	10.2.209.157
80	10.2.209.158/31	10.2.209.158 – 10.2.209.159	10.2.209.159
81	10.2.209.160/31	10.2.209.160 – 10.2.209.161	10.2.209.161
82	10.2.209.162/31	10.2.209.162 – 10.2.209.163	10.2.209.163
83	10.2.209.164/31	10.2.209.164 – 10.2.209.165	10.2.209.165
84	10.2.209.166/31	10.2.209.166 – 10.2.209.167	10.2.209.167
85	10.2.209.168/31	10.2.209.168 – 10.2.209.169	10.2.209.169
86	10.2.209.170/31	10.2.209.170 – 10.2.209.171	10.2.209.171
87	10.2.209.172/31	10.2.209.172 – 10.2.209.173	10.2.209.173
88	10.2.209.174/31	10.2.209.174 – 10.2.209.175	10.2.209.175
89	10.2.209.176/31	10.2.209.176 – 10.2.209.177	10.2.209.177
90	10.2.209.178/31	10.2.209.178 – 10.2.209.179	10.2.209.179
91	10.2.209.180/31	10.2.209.180 – 10.2.209.181	10.2.209.181
92	10.2.209.182/31	10.2.209.182 – 10.2.209.183	10.2.209.183
93	10.2.209.184/31	10.2.209.184 – 10.2.209.185	10.2.209.185
94	10.2.209.186/31	10.2.209.186 – 10.2.209.187	10.2.209.187
95	10.2.209.188/31	10.2.209.188 – 10.2.209.189	10.2.209.189
96	10.2.209.190/31	10.2.209.190 – 10.2.209.191	10.2.209.191
97	10.2.209.192/31	10.2.209.192 – 10.2.209.193	10.2.209.193
98	10.2.209.194/31	10.2.209.194 – 10.2.209.195	10.2.209.195
99	10.2.209.196/31	10.2.209.196 – 10.2.209.197	10.2.209.197
100	10.2.209.198/31	10.2.209.198 – 10.2.209.199	10.2.209.199
101	10.2.209.200/31	10.2.209.200 – 10.2.209.201	10.2.209.201
102	10.2.209.202/31	10.2.209.202 – 10.2.209.203	10.2.209.203
103	10.2.209.204/31	10.2.209.204 – 10.2.209.205	10.2.209.205
104	10.2.209.206/31	10.2.209.206 – 10.2.209.207	10.2.209.207
105	10.2.209.208/31	10.2.209.208 – 10.2.209.209	10.2.209.209
106	10.2.209.210/31	10.2.209.210 – 10.2.209.211	10.2.209.211
107	10.2.209.212/31	10.2.209.212 – 10.2.209.213	10.2.209.213
108	10.2.209.214/31	10.2.209.214 – 10.2.209.215	10.2.209.215
109	10.2.209.216/31	10.2.209.216 – 10.2.209.217	10.2.209.217
110	10.2.209.218/31	10.2.209.218 – 10.2.209.219	10.2.209.219
111	10.2.209.220/31	10.2.209.220 – 10.2.209.221	10.2.209.221
112	10.2.209.222/31	10.2.209.222 – 10.2.209.223	10.2.209.223
113	10.2.209.224/31	10.2.209.224 – 10.2.209.225	10.2.209.225
114	10.2.209.226/31	10.2.209.226 – 10.2.209.227	10.2.209.227
115	10.2.209.228/31	10.2.209.228 – 10.2.209.229	10.2.209.229
116	10.2.209.230/31	10.2.209.230 – 10.2.209.231	10.2.209.231
117	10.2.209.232/31	10.2.209.232 – 10.2.209.233	10.2.209.233
118	10.2.209.234/31	10.2.209.234 – 10.2.209.235	10.2.209.235
119	10.2.209.236/31	10.2.209.236 – 10.2.209.237	10.2.209.237
120	10.2.209.238/31	10.2.209.238 – 10.2.209.239	10.2.209.239
121	10.2.209.240/31	10.2.209.240 – 10.2.209.241	10.2.209.241
122	10.2.209.242/31	10.2.209.242 – 10.2.209.243	10.2.209.243
123	10.2.209.244/31	10.2.209.244 – 10.2.209.245	10.2.209.245
124	10.2.209.246/31	10.2.209.246 – 10.2.209.247	10.2.209.247
125	10.2.209.248/31	10.2.209.248 – 10.2.209.249	10.2.209.249
126	10.2.209.250/31	10.2.209.250 – 10.2.209.251	10.2.209.251
127	10.2.209.252/31	10.2.209.252 – 10.2.209.253	10.2.209.253
128	10.2.209.254/31	10.2.209.254 – 10.2.209.255	10.2.209.255

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 →