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)10.3.47.0/24

network10.3.47.0/24

broadcast10.3.47.255

first host10.3.47.1

last host10.3.47.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.47.0/24

address00001010.00000011.00101111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.00101111.00000000

broadcast00001010.00000011.00101111.11111111

green = network part, grey = host part

hex0x0a032f00

decimal167980800

reverse dns0.47.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:2f00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.47.0/31	10.3.47.0 – 10.3.47.1	10.3.47.1
2	10.3.47.2/31	10.3.47.2 – 10.3.47.3	10.3.47.3
3	10.3.47.4/31	10.3.47.4 – 10.3.47.5	10.3.47.5
4	10.3.47.6/31	10.3.47.6 – 10.3.47.7	10.3.47.7
5	10.3.47.8/31	10.3.47.8 – 10.3.47.9	10.3.47.9
6	10.3.47.10/31	10.3.47.10 – 10.3.47.11	10.3.47.11
7	10.3.47.12/31	10.3.47.12 – 10.3.47.13	10.3.47.13
8	10.3.47.14/31	10.3.47.14 – 10.3.47.15	10.3.47.15
9	10.3.47.16/31	10.3.47.16 – 10.3.47.17	10.3.47.17
10	10.3.47.18/31	10.3.47.18 – 10.3.47.19	10.3.47.19
11	10.3.47.20/31	10.3.47.20 – 10.3.47.21	10.3.47.21
12	10.3.47.22/31	10.3.47.22 – 10.3.47.23	10.3.47.23
13	10.3.47.24/31	10.3.47.24 – 10.3.47.25	10.3.47.25
14	10.3.47.26/31	10.3.47.26 – 10.3.47.27	10.3.47.27
15	10.3.47.28/31	10.3.47.28 – 10.3.47.29	10.3.47.29
16	10.3.47.30/31	10.3.47.30 – 10.3.47.31	10.3.47.31
17	10.3.47.32/31	10.3.47.32 – 10.3.47.33	10.3.47.33
18	10.3.47.34/31	10.3.47.34 – 10.3.47.35	10.3.47.35
19	10.3.47.36/31	10.3.47.36 – 10.3.47.37	10.3.47.37
20	10.3.47.38/31	10.3.47.38 – 10.3.47.39	10.3.47.39
21	10.3.47.40/31	10.3.47.40 – 10.3.47.41	10.3.47.41
22	10.3.47.42/31	10.3.47.42 – 10.3.47.43	10.3.47.43
23	10.3.47.44/31	10.3.47.44 – 10.3.47.45	10.3.47.45
24	10.3.47.46/31	10.3.47.46 – 10.3.47.47	10.3.47.47
25	10.3.47.48/31	10.3.47.48 – 10.3.47.49	10.3.47.49
26	10.3.47.50/31	10.3.47.50 – 10.3.47.51	10.3.47.51
27	10.3.47.52/31	10.3.47.52 – 10.3.47.53	10.3.47.53
28	10.3.47.54/31	10.3.47.54 – 10.3.47.55	10.3.47.55
29	10.3.47.56/31	10.3.47.56 – 10.3.47.57	10.3.47.57
30	10.3.47.58/31	10.3.47.58 – 10.3.47.59	10.3.47.59
31	10.3.47.60/31	10.3.47.60 – 10.3.47.61	10.3.47.61
32	10.3.47.62/31	10.3.47.62 – 10.3.47.63	10.3.47.63
33	10.3.47.64/31	10.3.47.64 – 10.3.47.65	10.3.47.65
34	10.3.47.66/31	10.3.47.66 – 10.3.47.67	10.3.47.67
35	10.3.47.68/31	10.3.47.68 – 10.3.47.69	10.3.47.69
36	10.3.47.70/31	10.3.47.70 – 10.3.47.71	10.3.47.71
37	10.3.47.72/31	10.3.47.72 – 10.3.47.73	10.3.47.73
38	10.3.47.74/31	10.3.47.74 – 10.3.47.75	10.3.47.75
39	10.3.47.76/31	10.3.47.76 – 10.3.47.77	10.3.47.77
40	10.3.47.78/31	10.3.47.78 – 10.3.47.79	10.3.47.79
41	10.3.47.80/31	10.3.47.80 – 10.3.47.81	10.3.47.81
42	10.3.47.82/31	10.3.47.82 – 10.3.47.83	10.3.47.83
43	10.3.47.84/31	10.3.47.84 – 10.3.47.85	10.3.47.85
44	10.3.47.86/31	10.3.47.86 – 10.3.47.87	10.3.47.87
45	10.3.47.88/31	10.3.47.88 – 10.3.47.89	10.3.47.89
46	10.3.47.90/31	10.3.47.90 – 10.3.47.91	10.3.47.91
47	10.3.47.92/31	10.3.47.92 – 10.3.47.93	10.3.47.93
48	10.3.47.94/31	10.3.47.94 – 10.3.47.95	10.3.47.95
49	10.3.47.96/31	10.3.47.96 – 10.3.47.97	10.3.47.97
50	10.3.47.98/31	10.3.47.98 – 10.3.47.99	10.3.47.99
51	10.3.47.100/31	10.3.47.100 – 10.3.47.101	10.3.47.101
52	10.3.47.102/31	10.3.47.102 – 10.3.47.103	10.3.47.103
53	10.3.47.104/31	10.3.47.104 – 10.3.47.105	10.3.47.105
54	10.3.47.106/31	10.3.47.106 – 10.3.47.107	10.3.47.107
55	10.3.47.108/31	10.3.47.108 – 10.3.47.109	10.3.47.109
56	10.3.47.110/31	10.3.47.110 – 10.3.47.111	10.3.47.111
57	10.3.47.112/31	10.3.47.112 – 10.3.47.113	10.3.47.113
58	10.3.47.114/31	10.3.47.114 – 10.3.47.115	10.3.47.115
59	10.3.47.116/31	10.3.47.116 – 10.3.47.117	10.3.47.117
60	10.3.47.118/31	10.3.47.118 – 10.3.47.119	10.3.47.119
61	10.3.47.120/31	10.3.47.120 – 10.3.47.121	10.3.47.121
62	10.3.47.122/31	10.3.47.122 – 10.3.47.123	10.3.47.123
63	10.3.47.124/31	10.3.47.124 – 10.3.47.125	10.3.47.125
64	10.3.47.126/31	10.3.47.126 – 10.3.47.127	10.3.47.127
65	10.3.47.128/31	10.3.47.128 – 10.3.47.129	10.3.47.129
66	10.3.47.130/31	10.3.47.130 – 10.3.47.131	10.3.47.131
67	10.3.47.132/31	10.3.47.132 – 10.3.47.133	10.3.47.133
68	10.3.47.134/31	10.3.47.134 – 10.3.47.135	10.3.47.135
69	10.3.47.136/31	10.3.47.136 – 10.3.47.137	10.3.47.137
70	10.3.47.138/31	10.3.47.138 – 10.3.47.139	10.3.47.139
71	10.3.47.140/31	10.3.47.140 – 10.3.47.141	10.3.47.141
72	10.3.47.142/31	10.3.47.142 – 10.3.47.143	10.3.47.143
73	10.3.47.144/31	10.3.47.144 – 10.3.47.145	10.3.47.145
74	10.3.47.146/31	10.3.47.146 – 10.3.47.147	10.3.47.147
75	10.3.47.148/31	10.3.47.148 – 10.3.47.149	10.3.47.149
76	10.3.47.150/31	10.3.47.150 – 10.3.47.151	10.3.47.151
77	10.3.47.152/31	10.3.47.152 – 10.3.47.153	10.3.47.153
78	10.3.47.154/31	10.3.47.154 – 10.3.47.155	10.3.47.155
79	10.3.47.156/31	10.3.47.156 – 10.3.47.157	10.3.47.157
80	10.3.47.158/31	10.3.47.158 – 10.3.47.159	10.3.47.159
81	10.3.47.160/31	10.3.47.160 – 10.3.47.161	10.3.47.161
82	10.3.47.162/31	10.3.47.162 – 10.3.47.163	10.3.47.163
83	10.3.47.164/31	10.3.47.164 – 10.3.47.165	10.3.47.165
84	10.3.47.166/31	10.3.47.166 – 10.3.47.167	10.3.47.167
85	10.3.47.168/31	10.3.47.168 – 10.3.47.169	10.3.47.169
86	10.3.47.170/31	10.3.47.170 – 10.3.47.171	10.3.47.171
87	10.3.47.172/31	10.3.47.172 – 10.3.47.173	10.3.47.173
88	10.3.47.174/31	10.3.47.174 – 10.3.47.175	10.3.47.175
89	10.3.47.176/31	10.3.47.176 – 10.3.47.177	10.3.47.177
90	10.3.47.178/31	10.3.47.178 – 10.3.47.179	10.3.47.179
91	10.3.47.180/31	10.3.47.180 – 10.3.47.181	10.3.47.181
92	10.3.47.182/31	10.3.47.182 – 10.3.47.183	10.3.47.183
93	10.3.47.184/31	10.3.47.184 – 10.3.47.185	10.3.47.185
94	10.3.47.186/31	10.3.47.186 – 10.3.47.187	10.3.47.187
95	10.3.47.188/31	10.3.47.188 – 10.3.47.189	10.3.47.189
96	10.3.47.190/31	10.3.47.190 – 10.3.47.191	10.3.47.191
97	10.3.47.192/31	10.3.47.192 – 10.3.47.193	10.3.47.193
98	10.3.47.194/31	10.3.47.194 – 10.3.47.195	10.3.47.195
99	10.3.47.196/31	10.3.47.196 – 10.3.47.197	10.3.47.197
100	10.3.47.198/31	10.3.47.198 – 10.3.47.199	10.3.47.199
101	10.3.47.200/31	10.3.47.200 – 10.3.47.201	10.3.47.201
102	10.3.47.202/31	10.3.47.202 – 10.3.47.203	10.3.47.203
103	10.3.47.204/31	10.3.47.204 – 10.3.47.205	10.3.47.205
104	10.3.47.206/31	10.3.47.206 – 10.3.47.207	10.3.47.207
105	10.3.47.208/31	10.3.47.208 – 10.3.47.209	10.3.47.209
106	10.3.47.210/31	10.3.47.210 – 10.3.47.211	10.3.47.211
107	10.3.47.212/31	10.3.47.212 – 10.3.47.213	10.3.47.213
108	10.3.47.214/31	10.3.47.214 – 10.3.47.215	10.3.47.215
109	10.3.47.216/31	10.3.47.216 – 10.3.47.217	10.3.47.217
110	10.3.47.218/31	10.3.47.218 – 10.3.47.219	10.3.47.219
111	10.3.47.220/31	10.3.47.220 – 10.3.47.221	10.3.47.221
112	10.3.47.222/31	10.3.47.222 – 10.3.47.223	10.3.47.223
113	10.3.47.224/31	10.3.47.224 – 10.3.47.225	10.3.47.225
114	10.3.47.226/31	10.3.47.226 – 10.3.47.227	10.3.47.227
115	10.3.47.228/31	10.3.47.228 – 10.3.47.229	10.3.47.229
116	10.3.47.230/31	10.3.47.230 – 10.3.47.231	10.3.47.231
117	10.3.47.232/31	10.3.47.232 – 10.3.47.233	10.3.47.233
118	10.3.47.234/31	10.3.47.234 – 10.3.47.235	10.3.47.235
119	10.3.47.236/31	10.3.47.236 – 10.3.47.237	10.3.47.237
120	10.3.47.238/31	10.3.47.238 – 10.3.47.239	10.3.47.239
121	10.3.47.240/31	10.3.47.240 – 10.3.47.241	10.3.47.241
122	10.3.47.242/31	10.3.47.242 – 10.3.47.243	10.3.47.243
123	10.3.47.244/31	10.3.47.244 – 10.3.47.245	10.3.47.245
124	10.3.47.246/31	10.3.47.246 – 10.3.47.247	10.3.47.247
125	10.3.47.248/31	10.3.47.248 – 10.3.47.249	10.3.47.249
126	10.3.47.250/31	10.3.47.250 – 10.3.47.251	10.3.47.251
127	10.3.47.252/31	10.3.47.252 – 10.3.47.253	10.3.47.253
128	10.3.47.254/31	10.3.47.254 – 10.3.47.255	10.3.47.255

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 →