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)10.0.3.0/24

network10.0.3.0/24

broadcast10.0.3.255

first host10.0.3.1

last host10.0.3.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.3.0/24

address00001010.00000000.00000011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.00000011.00000000

broadcast00001010.00000000.00000011.11111111

green = network part, grey = host part

hex0x0a000300

decimal167772928

reverse dns0.3.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:300

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.3.0/31	10.0.3.0 – 10.0.3.1	10.0.3.1
2	10.0.3.2/31	10.0.3.2 – 10.0.3.3	10.0.3.3
3	10.0.3.4/31	10.0.3.4 – 10.0.3.5	10.0.3.5
4	10.0.3.6/31	10.0.3.6 – 10.0.3.7	10.0.3.7
5	10.0.3.8/31	10.0.3.8 – 10.0.3.9	10.0.3.9
6	10.0.3.10/31	10.0.3.10 – 10.0.3.11	10.0.3.11
7	10.0.3.12/31	10.0.3.12 – 10.0.3.13	10.0.3.13
8	10.0.3.14/31	10.0.3.14 – 10.0.3.15	10.0.3.15
9	10.0.3.16/31	10.0.3.16 – 10.0.3.17	10.0.3.17
10	10.0.3.18/31	10.0.3.18 – 10.0.3.19	10.0.3.19
11	10.0.3.20/31	10.0.3.20 – 10.0.3.21	10.0.3.21
12	10.0.3.22/31	10.0.3.22 – 10.0.3.23	10.0.3.23
13	10.0.3.24/31	10.0.3.24 – 10.0.3.25	10.0.3.25
14	10.0.3.26/31	10.0.3.26 – 10.0.3.27	10.0.3.27
15	10.0.3.28/31	10.0.3.28 – 10.0.3.29	10.0.3.29
16	10.0.3.30/31	10.0.3.30 – 10.0.3.31	10.0.3.31
17	10.0.3.32/31	10.0.3.32 – 10.0.3.33	10.0.3.33
18	10.0.3.34/31	10.0.3.34 – 10.0.3.35	10.0.3.35
19	10.0.3.36/31	10.0.3.36 – 10.0.3.37	10.0.3.37
20	10.0.3.38/31	10.0.3.38 – 10.0.3.39	10.0.3.39
21	10.0.3.40/31	10.0.3.40 – 10.0.3.41	10.0.3.41
22	10.0.3.42/31	10.0.3.42 – 10.0.3.43	10.0.3.43
23	10.0.3.44/31	10.0.3.44 – 10.0.3.45	10.0.3.45
24	10.0.3.46/31	10.0.3.46 – 10.0.3.47	10.0.3.47
25	10.0.3.48/31	10.0.3.48 – 10.0.3.49	10.0.3.49
26	10.0.3.50/31	10.0.3.50 – 10.0.3.51	10.0.3.51
27	10.0.3.52/31	10.0.3.52 – 10.0.3.53	10.0.3.53
28	10.0.3.54/31	10.0.3.54 – 10.0.3.55	10.0.3.55
29	10.0.3.56/31	10.0.3.56 – 10.0.3.57	10.0.3.57
30	10.0.3.58/31	10.0.3.58 – 10.0.3.59	10.0.3.59
31	10.0.3.60/31	10.0.3.60 – 10.0.3.61	10.0.3.61
32	10.0.3.62/31	10.0.3.62 – 10.0.3.63	10.0.3.63
33	10.0.3.64/31	10.0.3.64 – 10.0.3.65	10.0.3.65
34	10.0.3.66/31	10.0.3.66 – 10.0.3.67	10.0.3.67
35	10.0.3.68/31	10.0.3.68 – 10.0.3.69	10.0.3.69
36	10.0.3.70/31	10.0.3.70 – 10.0.3.71	10.0.3.71
37	10.0.3.72/31	10.0.3.72 – 10.0.3.73	10.0.3.73
38	10.0.3.74/31	10.0.3.74 – 10.0.3.75	10.0.3.75
39	10.0.3.76/31	10.0.3.76 – 10.0.3.77	10.0.3.77
40	10.0.3.78/31	10.0.3.78 – 10.0.3.79	10.0.3.79
41	10.0.3.80/31	10.0.3.80 – 10.0.3.81	10.0.3.81
42	10.0.3.82/31	10.0.3.82 – 10.0.3.83	10.0.3.83
43	10.0.3.84/31	10.0.3.84 – 10.0.3.85	10.0.3.85
44	10.0.3.86/31	10.0.3.86 – 10.0.3.87	10.0.3.87
45	10.0.3.88/31	10.0.3.88 – 10.0.3.89	10.0.3.89
46	10.0.3.90/31	10.0.3.90 – 10.0.3.91	10.0.3.91
47	10.0.3.92/31	10.0.3.92 – 10.0.3.93	10.0.3.93
48	10.0.3.94/31	10.0.3.94 – 10.0.3.95	10.0.3.95
49	10.0.3.96/31	10.0.3.96 – 10.0.3.97	10.0.3.97
50	10.0.3.98/31	10.0.3.98 – 10.0.3.99	10.0.3.99
51	10.0.3.100/31	10.0.3.100 – 10.0.3.101	10.0.3.101
52	10.0.3.102/31	10.0.3.102 – 10.0.3.103	10.0.3.103
53	10.0.3.104/31	10.0.3.104 – 10.0.3.105	10.0.3.105
54	10.0.3.106/31	10.0.3.106 – 10.0.3.107	10.0.3.107
55	10.0.3.108/31	10.0.3.108 – 10.0.3.109	10.0.3.109
56	10.0.3.110/31	10.0.3.110 – 10.0.3.111	10.0.3.111
57	10.0.3.112/31	10.0.3.112 – 10.0.3.113	10.0.3.113
58	10.0.3.114/31	10.0.3.114 – 10.0.3.115	10.0.3.115
59	10.0.3.116/31	10.0.3.116 – 10.0.3.117	10.0.3.117
60	10.0.3.118/31	10.0.3.118 – 10.0.3.119	10.0.3.119
61	10.0.3.120/31	10.0.3.120 – 10.0.3.121	10.0.3.121
62	10.0.3.122/31	10.0.3.122 – 10.0.3.123	10.0.3.123
63	10.0.3.124/31	10.0.3.124 – 10.0.3.125	10.0.3.125
64	10.0.3.126/31	10.0.3.126 – 10.0.3.127	10.0.3.127
65	10.0.3.128/31	10.0.3.128 – 10.0.3.129	10.0.3.129
66	10.0.3.130/31	10.0.3.130 – 10.0.3.131	10.0.3.131
67	10.0.3.132/31	10.0.3.132 – 10.0.3.133	10.0.3.133
68	10.0.3.134/31	10.0.3.134 – 10.0.3.135	10.0.3.135
69	10.0.3.136/31	10.0.3.136 – 10.0.3.137	10.0.3.137
70	10.0.3.138/31	10.0.3.138 – 10.0.3.139	10.0.3.139
71	10.0.3.140/31	10.0.3.140 – 10.0.3.141	10.0.3.141
72	10.0.3.142/31	10.0.3.142 – 10.0.3.143	10.0.3.143
73	10.0.3.144/31	10.0.3.144 – 10.0.3.145	10.0.3.145
74	10.0.3.146/31	10.0.3.146 – 10.0.3.147	10.0.3.147
75	10.0.3.148/31	10.0.3.148 – 10.0.3.149	10.0.3.149
76	10.0.3.150/31	10.0.3.150 – 10.0.3.151	10.0.3.151
77	10.0.3.152/31	10.0.3.152 – 10.0.3.153	10.0.3.153
78	10.0.3.154/31	10.0.3.154 – 10.0.3.155	10.0.3.155
79	10.0.3.156/31	10.0.3.156 – 10.0.3.157	10.0.3.157
80	10.0.3.158/31	10.0.3.158 – 10.0.3.159	10.0.3.159
81	10.0.3.160/31	10.0.3.160 – 10.0.3.161	10.0.3.161
82	10.0.3.162/31	10.0.3.162 – 10.0.3.163	10.0.3.163
83	10.0.3.164/31	10.0.3.164 – 10.0.3.165	10.0.3.165
84	10.0.3.166/31	10.0.3.166 – 10.0.3.167	10.0.3.167
85	10.0.3.168/31	10.0.3.168 – 10.0.3.169	10.0.3.169
86	10.0.3.170/31	10.0.3.170 – 10.0.3.171	10.0.3.171
87	10.0.3.172/31	10.0.3.172 – 10.0.3.173	10.0.3.173
88	10.0.3.174/31	10.0.3.174 – 10.0.3.175	10.0.3.175
89	10.0.3.176/31	10.0.3.176 – 10.0.3.177	10.0.3.177
90	10.0.3.178/31	10.0.3.178 – 10.0.3.179	10.0.3.179
91	10.0.3.180/31	10.0.3.180 – 10.0.3.181	10.0.3.181
92	10.0.3.182/31	10.0.3.182 – 10.0.3.183	10.0.3.183
93	10.0.3.184/31	10.0.3.184 – 10.0.3.185	10.0.3.185
94	10.0.3.186/31	10.0.3.186 – 10.0.3.187	10.0.3.187
95	10.0.3.188/31	10.0.3.188 – 10.0.3.189	10.0.3.189
96	10.0.3.190/31	10.0.3.190 – 10.0.3.191	10.0.3.191
97	10.0.3.192/31	10.0.3.192 – 10.0.3.193	10.0.3.193
98	10.0.3.194/31	10.0.3.194 – 10.0.3.195	10.0.3.195
99	10.0.3.196/31	10.0.3.196 – 10.0.3.197	10.0.3.197
100	10.0.3.198/31	10.0.3.198 – 10.0.3.199	10.0.3.199
101	10.0.3.200/31	10.0.3.200 – 10.0.3.201	10.0.3.201
102	10.0.3.202/31	10.0.3.202 – 10.0.3.203	10.0.3.203
103	10.0.3.204/31	10.0.3.204 – 10.0.3.205	10.0.3.205
104	10.0.3.206/31	10.0.3.206 – 10.0.3.207	10.0.3.207
105	10.0.3.208/31	10.0.3.208 – 10.0.3.209	10.0.3.209
106	10.0.3.210/31	10.0.3.210 – 10.0.3.211	10.0.3.211
107	10.0.3.212/31	10.0.3.212 – 10.0.3.213	10.0.3.213
108	10.0.3.214/31	10.0.3.214 – 10.0.3.215	10.0.3.215
109	10.0.3.216/31	10.0.3.216 – 10.0.3.217	10.0.3.217
110	10.0.3.218/31	10.0.3.218 – 10.0.3.219	10.0.3.219
111	10.0.3.220/31	10.0.3.220 – 10.0.3.221	10.0.3.221
112	10.0.3.222/31	10.0.3.222 – 10.0.3.223	10.0.3.223
113	10.0.3.224/31	10.0.3.224 – 10.0.3.225	10.0.3.225
114	10.0.3.226/31	10.0.3.226 – 10.0.3.227	10.0.3.227
115	10.0.3.228/31	10.0.3.228 – 10.0.3.229	10.0.3.229
116	10.0.3.230/31	10.0.3.230 – 10.0.3.231	10.0.3.231
117	10.0.3.232/31	10.0.3.232 – 10.0.3.233	10.0.3.233
118	10.0.3.234/31	10.0.3.234 – 10.0.3.235	10.0.3.235
119	10.0.3.236/31	10.0.3.236 – 10.0.3.237	10.0.3.237
120	10.0.3.238/31	10.0.3.238 – 10.0.3.239	10.0.3.239
121	10.0.3.240/31	10.0.3.240 – 10.0.3.241	10.0.3.241
122	10.0.3.242/31	10.0.3.242 – 10.0.3.243	10.0.3.243
123	10.0.3.244/31	10.0.3.244 – 10.0.3.245	10.0.3.245
124	10.0.3.246/31	10.0.3.246 – 10.0.3.247	10.0.3.247
125	10.0.3.248/31	10.0.3.248 – 10.0.3.249	10.0.3.249
126	10.0.3.250/31	10.0.3.250 – 10.0.3.251	10.0.3.251
127	10.0.3.252/31	10.0.3.252 – 10.0.3.253	10.0.3.253
128	10.0.3.254/31	10.0.3.254 – 10.0.3.255	10.0.3.255

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 →