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)10.2.204.0/24

network10.2.204.0/24

broadcast10.2.204.255

first host10.2.204.1

last host10.2.204.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.2.204.0/24

address00001010.00000010.11001100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000010.11001100.00000000

broadcast00001010.00000010.11001100.11111111

green = network part, grey = host part

hex0x0a02cc00

decimal167955456

reverse dns0.204.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:cc00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.204.0/31	10.2.204.0 – 10.2.204.1	10.2.204.1
2	10.2.204.2/31	10.2.204.2 – 10.2.204.3	10.2.204.3
3	10.2.204.4/31	10.2.204.4 – 10.2.204.5	10.2.204.5
4	10.2.204.6/31	10.2.204.6 – 10.2.204.7	10.2.204.7
5	10.2.204.8/31	10.2.204.8 – 10.2.204.9	10.2.204.9
6	10.2.204.10/31	10.2.204.10 – 10.2.204.11	10.2.204.11
7	10.2.204.12/31	10.2.204.12 – 10.2.204.13	10.2.204.13
8	10.2.204.14/31	10.2.204.14 – 10.2.204.15	10.2.204.15
9	10.2.204.16/31	10.2.204.16 – 10.2.204.17	10.2.204.17
10	10.2.204.18/31	10.2.204.18 – 10.2.204.19	10.2.204.19
11	10.2.204.20/31	10.2.204.20 – 10.2.204.21	10.2.204.21
12	10.2.204.22/31	10.2.204.22 – 10.2.204.23	10.2.204.23
13	10.2.204.24/31	10.2.204.24 – 10.2.204.25	10.2.204.25
14	10.2.204.26/31	10.2.204.26 – 10.2.204.27	10.2.204.27
15	10.2.204.28/31	10.2.204.28 – 10.2.204.29	10.2.204.29
16	10.2.204.30/31	10.2.204.30 – 10.2.204.31	10.2.204.31
17	10.2.204.32/31	10.2.204.32 – 10.2.204.33	10.2.204.33
18	10.2.204.34/31	10.2.204.34 – 10.2.204.35	10.2.204.35
19	10.2.204.36/31	10.2.204.36 – 10.2.204.37	10.2.204.37
20	10.2.204.38/31	10.2.204.38 – 10.2.204.39	10.2.204.39
21	10.2.204.40/31	10.2.204.40 – 10.2.204.41	10.2.204.41
22	10.2.204.42/31	10.2.204.42 – 10.2.204.43	10.2.204.43
23	10.2.204.44/31	10.2.204.44 – 10.2.204.45	10.2.204.45
24	10.2.204.46/31	10.2.204.46 – 10.2.204.47	10.2.204.47
25	10.2.204.48/31	10.2.204.48 – 10.2.204.49	10.2.204.49
26	10.2.204.50/31	10.2.204.50 – 10.2.204.51	10.2.204.51
27	10.2.204.52/31	10.2.204.52 – 10.2.204.53	10.2.204.53
28	10.2.204.54/31	10.2.204.54 – 10.2.204.55	10.2.204.55
29	10.2.204.56/31	10.2.204.56 – 10.2.204.57	10.2.204.57
30	10.2.204.58/31	10.2.204.58 – 10.2.204.59	10.2.204.59
31	10.2.204.60/31	10.2.204.60 – 10.2.204.61	10.2.204.61
32	10.2.204.62/31	10.2.204.62 – 10.2.204.63	10.2.204.63
33	10.2.204.64/31	10.2.204.64 – 10.2.204.65	10.2.204.65
34	10.2.204.66/31	10.2.204.66 – 10.2.204.67	10.2.204.67
35	10.2.204.68/31	10.2.204.68 – 10.2.204.69	10.2.204.69
36	10.2.204.70/31	10.2.204.70 – 10.2.204.71	10.2.204.71
37	10.2.204.72/31	10.2.204.72 – 10.2.204.73	10.2.204.73
38	10.2.204.74/31	10.2.204.74 – 10.2.204.75	10.2.204.75
39	10.2.204.76/31	10.2.204.76 – 10.2.204.77	10.2.204.77
40	10.2.204.78/31	10.2.204.78 – 10.2.204.79	10.2.204.79
41	10.2.204.80/31	10.2.204.80 – 10.2.204.81	10.2.204.81
42	10.2.204.82/31	10.2.204.82 – 10.2.204.83	10.2.204.83
43	10.2.204.84/31	10.2.204.84 – 10.2.204.85	10.2.204.85
44	10.2.204.86/31	10.2.204.86 – 10.2.204.87	10.2.204.87
45	10.2.204.88/31	10.2.204.88 – 10.2.204.89	10.2.204.89
46	10.2.204.90/31	10.2.204.90 – 10.2.204.91	10.2.204.91
47	10.2.204.92/31	10.2.204.92 – 10.2.204.93	10.2.204.93
48	10.2.204.94/31	10.2.204.94 – 10.2.204.95	10.2.204.95
49	10.2.204.96/31	10.2.204.96 – 10.2.204.97	10.2.204.97
50	10.2.204.98/31	10.2.204.98 – 10.2.204.99	10.2.204.99
51	10.2.204.100/31	10.2.204.100 – 10.2.204.101	10.2.204.101
52	10.2.204.102/31	10.2.204.102 – 10.2.204.103	10.2.204.103
53	10.2.204.104/31	10.2.204.104 – 10.2.204.105	10.2.204.105
54	10.2.204.106/31	10.2.204.106 – 10.2.204.107	10.2.204.107
55	10.2.204.108/31	10.2.204.108 – 10.2.204.109	10.2.204.109
56	10.2.204.110/31	10.2.204.110 – 10.2.204.111	10.2.204.111
57	10.2.204.112/31	10.2.204.112 – 10.2.204.113	10.2.204.113
58	10.2.204.114/31	10.2.204.114 – 10.2.204.115	10.2.204.115
59	10.2.204.116/31	10.2.204.116 – 10.2.204.117	10.2.204.117
60	10.2.204.118/31	10.2.204.118 – 10.2.204.119	10.2.204.119
61	10.2.204.120/31	10.2.204.120 – 10.2.204.121	10.2.204.121
62	10.2.204.122/31	10.2.204.122 – 10.2.204.123	10.2.204.123
63	10.2.204.124/31	10.2.204.124 – 10.2.204.125	10.2.204.125
64	10.2.204.126/31	10.2.204.126 – 10.2.204.127	10.2.204.127
65	10.2.204.128/31	10.2.204.128 – 10.2.204.129	10.2.204.129
66	10.2.204.130/31	10.2.204.130 – 10.2.204.131	10.2.204.131
67	10.2.204.132/31	10.2.204.132 – 10.2.204.133	10.2.204.133
68	10.2.204.134/31	10.2.204.134 – 10.2.204.135	10.2.204.135
69	10.2.204.136/31	10.2.204.136 – 10.2.204.137	10.2.204.137
70	10.2.204.138/31	10.2.204.138 – 10.2.204.139	10.2.204.139
71	10.2.204.140/31	10.2.204.140 – 10.2.204.141	10.2.204.141
72	10.2.204.142/31	10.2.204.142 – 10.2.204.143	10.2.204.143
73	10.2.204.144/31	10.2.204.144 – 10.2.204.145	10.2.204.145
74	10.2.204.146/31	10.2.204.146 – 10.2.204.147	10.2.204.147
75	10.2.204.148/31	10.2.204.148 – 10.2.204.149	10.2.204.149
76	10.2.204.150/31	10.2.204.150 – 10.2.204.151	10.2.204.151
77	10.2.204.152/31	10.2.204.152 – 10.2.204.153	10.2.204.153
78	10.2.204.154/31	10.2.204.154 – 10.2.204.155	10.2.204.155
79	10.2.204.156/31	10.2.204.156 – 10.2.204.157	10.2.204.157
80	10.2.204.158/31	10.2.204.158 – 10.2.204.159	10.2.204.159
81	10.2.204.160/31	10.2.204.160 – 10.2.204.161	10.2.204.161
82	10.2.204.162/31	10.2.204.162 – 10.2.204.163	10.2.204.163
83	10.2.204.164/31	10.2.204.164 – 10.2.204.165	10.2.204.165
84	10.2.204.166/31	10.2.204.166 – 10.2.204.167	10.2.204.167
85	10.2.204.168/31	10.2.204.168 – 10.2.204.169	10.2.204.169
86	10.2.204.170/31	10.2.204.170 – 10.2.204.171	10.2.204.171
87	10.2.204.172/31	10.2.204.172 – 10.2.204.173	10.2.204.173
88	10.2.204.174/31	10.2.204.174 – 10.2.204.175	10.2.204.175
89	10.2.204.176/31	10.2.204.176 – 10.2.204.177	10.2.204.177
90	10.2.204.178/31	10.2.204.178 – 10.2.204.179	10.2.204.179
91	10.2.204.180/31	10.2.204.180 – 10.2.204.181	10.2.204.181
92	10.2.204.182/31	10.2.204.182 – 10.2.204.183	10.2.204.183
93	10.2.204.184/31	10.2.204.184 – 10.2.204.185	10.2.204.185
94	10.2.204.186/31	10.2.204.186 – 10.2.204.187	10.2.204.187
95	10.2.204.188/31	10.2.204.188 – 10.2.204.189	10.2.204.189
96	10.2.204.190/31	10.2.204.190 – 10.2.204.191	10.2.204.191
97	10.2.204.192/31	10.2.204.192 – 10.2.204.193	10.2.204.193
98	10.2.204.194/31	10.2.204.194 – 10.2.204.195	10.2.204.195
99	10.2.204.196/31	10.2.204.196 – 10.2.204.197	10.2.204.197
100	10.2.204.198/31	10.2.204.198 – 10.2.204.199	10.2.204.199
101	10.2.204.200/31	10.2.204.200 – 10.2.204.201	10.2.204.201
102	10.2.204.202/31	10.2.204.202 – 10.2.204.203	10.2.204.203
103	10.2.204.204/31	10.2.204.204 – 10.2.204.205	10.2.204.205
104	10.2.204.206/31	10.2.204.206 – 10.2.204.207	10.2.204.207
105	10.2.204.208/31	10.2.204.208 – 10.2.204.209	10.2.204.209
106	10.2.204.210/31	10.2.204.210 – 10.2.204.211	10.2.204.211
107	10.2.204.212/31	10.2.204.212 – 10.2.204.213	10.2.204.213
108	10.2.204.214/31	10.2.204.214 – 10.2.204.215	10.2.204.215
109	10.2.204.216/31	10.2.204.216 – 10.2.204.217	10.2.204.217
110	10.2.204.218/31	10.2.204.218 – 10.2.204.219	10.2.204.219
111	10.2.204.220/31	10.2.204.220 – 10.2.204.221	10.2.204.221
112	10.2.204.222/31	10.2.204.222 – 10.2.204.223	10.2.204.223
113	10.2.204.224/31	10.2.204.224 – 10.2.204.225	10.2.204.225
114	10.2.204.226/31	10.2.204.226 – 10.2.204.227	10.2.204.227
115	10.2.204.228/31	10.2.204.228 – 10.2.204.229	10.2.204.229
116	10.2.204.230/31	10.2.204.230 – 10.2.204.231	10.2.204.231
117	10.2.204.232/31	10.2.204.232 – 10.2.204.233	10.2.204.233
118	10.2.204.234/31	10.2.204.234 – 10.2.204.235	10.2.204.235
119	10.2.204.236/31	10.2.204.236 – 10.2.204.237	10.2.204.237
120	10.2.204.238/31	10.2.204.238 – 10.2.204.239	10.2.204.239
121	10.2.204.240/31	10.2.204.240 – 10.2.204.241	10.2.204.241
122	10.2.204.242/31	10.2.204.242 – 10.2.204.243	10.2.204.243
123	10.2.204.244/31	10.2.204.244 – 10.2.204.245	10.2.204.245
124	10.2.204.246/31	10.2.204.246 – 10.2.204.247	10.2.204.247
125	10.2.204.248/31	10.2.204.248 – 10.2.204.249	10.2.204.249
126	10.2.204.250/31	10.2.204.250 – 10.2.204.251	10.2.204.251
127	10.2.204.252/31	10.2.204.252 – 10.2.204.253	10.2.204.253
128	10.2.204.254/31	10.2.204.254 – 10.2.204.255	10.2.204.255

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 →