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)10.0.4.0/24

network10.0.4.0/24

broadcast10.0.4.255

first host10.0.4.1

last host10.0.4.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.0.4.0/24

address00001010.00000000.00000100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000000.00000100.00000000

broadcast00001010.00000000.00000100.11111111

green = network part, grey = host part

hex0x0a000400

decimal167773184

reverse dns0.4.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:400

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.4.0/31	10.0.4.0 – 10.0.4.1	10.0.4.1
2	10.0.4.2/31	10.0.4.2 – 10.0.4.3	10.0.4.3
3	10.0.4.4/31	10.0.4.4 – 10.0.4.5	10.0.4.5
4	10.0.4.6/31	10.0.4.6 – 10.0.4.7	10.0.4.7
5	10.0.4.8/31	10.0.4.8 – 10.0.4.9	10.0.4.9
6	10.0.4.10/31	10.0.4.10 – 10.0.4.11	10.0.4.11
7	10.0.4.12/31	10.0.4.12 – 10.0.4.13	10.0.4.13
8	10.0.4.14/31	10.0.4.14 – 10.0.4.15	10.0.4.15
9	10.0.4.16/31	10.0.4.16 – 10.0.4.17	10.0.4.17
10	10.0.4.18/31	10.0.4.18 – 10.0.4.19	10.0.4.19
11	10.0.4.20/31	10.0.4.20 – 10.0.4.21	10.0.4.21
12	10.0.4.22/31	10.0.4.22 – 10.0.4.23	10.0.4.23
13	10.0.4.24/31	10.0.4.24 – 10.0.4.25	10.0.4.25
14	10.0.4.26/31	10.0.4.26 – 10.0.4.27	10.0.4.27
15	10.0.4.28/31	10.0.4.28 – 10.0.4.29	10.0.4.29
16	10.0.4.30/31	10.0.4.30 – 10.0.4.31	10.0.4.31
17	10.0.4.32/31	10.0.4.32 – 10.0.4.33	10.0.4.33
18	10.0.4.34/31	10.0.4.34 – 10.0.4.35	10.0.4.35
19	10.0.4.36/31	10.0.4.36 – 10.0.4.37	10.0.4.37
20	10.0.4.38/31	10.0.4.38 – 10.0.4.39	10.0.4.39
21	10.0.4.40/31	10.0.4.40 – 10.0.4.41	10.0.4.41
22	10.0.4.42/31	10.0.4.42 – 10.0.4.43	10.0.4.43
23	10.0.4.44/31	10.0.4.44 – 10.0.4.45	10.0.4.45
24	10.0.4.46/31	10.0.4.46 – 10.0.4.47	10.0.4.47
25	10.0.4.48/31	10.0.4.48 – 10.0.4.49	10.0.4.49
26	10.0.4.50/31	10.0.4.50 – 10.0.4.51	10.0.4.51
27	10.0.4.52/31	10.0.4.52 – 10.0.4.53	10.0.4.53
28	10.0.4.54/31	10.0.4.54 – 10.0.4.55	10.0.4.55
29	10.0.4.56/31	10.0.4.56 – 10.0.4.57	10.0.4.57
30	10.0.4.58/31	10.0.4.58 – 10.0.4.59	10.0.4.59
31	10.0.4.60/31	10.0.4.60 – 10.0.4.61	10.0.4.61
32	10.0.4.62/31	10.0.4.62 – 10.0.4.63	10.0.4.63
33	10.0.4.64/31	10.0.4.64 – 10.0.4.65	10.0.4.65
34	10.0.4.66/31	10.0.4.66 – 10.0.4.67	10.0.4.67
35	10.0.4.68/31	10.0.4.68 – 10.0.4.69	10.0.4.69
36	10.0.4.70/31	10.0.4.70 – 10.0.4.71	10.0.4.71
37	10.0.4.72/31	10.0.4.72 – 10.0.4.73	10.0.4.73
38	10.0.4.74/31	10.0.4.74 – 10.0.4.75	10.0.4.75
39	10.0.4.76/31	10.0.4.76 – 10.0.4.77	10.0.4.77
40	10.0.4.78/31	10.0.4.78 – 10.0.4.79	10.0.4.79
41	10.0.4.80/31	10.0.4.80 – 10.0.4.81	10.0.4.81
42	10.0.4.82/31	10.0.4.82 – 10.0.4.83	10.0.4.83
43	10.0.4.84/31	10.0.4.84 – 10.0.4.85	10.0.4.85
44	10.0.4.86/31	10.0.4.86 – 10.0.4.87	10.0.4.87
45	10.0.4.88/31	10.0.4.88 – 10.0.4.89	10.0.4.89
46	10.0.4.90/31	10.0.4.90 – 10.0.4.91	10.0.4.91
47	10.0.4.92/31	10.0.4.92 – 10.0.4.93	10.0.4.93
48	10.0.4.94/31	10.0.4.94 – 10.0.4.95	10.0.4.95
49	10.0.4.96/31	10.0.4.96 – 10.0.4.97	10.0.4.97
50	10.0.4.98/31	10.0.4.98 – 10.0.4.99	10.0.4.99
51	10.0.4.100/31	10.0.4.100 – 10.0.4.101	10.0.4.101
52	10.0.4.102/31	10.0.4.102 – 10.0.4.103	10.0.4.103
53	10.0.4.104/31	10.0.4.104 – 10.0.4.105	10.0.4.105
54	10.0.4.106/31	10.0.4.106 – 10.0.4.107	10.0.4.107
55	10.0.4.108/31	10.0.4.108 – 10.0.4.109	10.0.4.109
56	10.0.4.110/31	10.0.4.110 – 10.0.4.111	10.0.4.111
57	10.0.4.112/31	10.0.4.112 – 10.0.4.113	10.0.4.113
58	10.0.4.114/31	10.0.4.114 – 10.0.4.115	10.0.4.115
59	10.0.4.116/31	10.0.4.116 – 10.0.4.117	10.0.4.117
60	10.0.4.118/31	10.0.4.118 – 10.0.4.119	10.0.4.119
61	10.0.4.120/31	10.0.4.120 – 10.0.4.121	10.0.4.121
62	10.0.4.122/31	10.0.4.122 – 10.0.4.123	10.0.4.123
63	10.0.4.124/31	10.0.4.124 – 10.0.4.125	10.0.4.125
64	10.0.4.126/31	10.0.4.126 – 10.0.4.127	10.0.4.127
65	10.0.4.128/31	10.0.4.128 – 10.0.4.129	10.0.4.129
66	10.0.4.130/31	10.0.4.130 – 10.0.4.131	10.0.4.131
67	10.0.4.132/31	10.0.4.132 – 10.0.4.133	10.0.4.133
68	10.0.4.134/31	10.0.4.134 – 10.0.4.135	10.0.4.135
69	10.0.4.136/31	10.0.4.136 – 10.0.4.137	10.0.4.137
70	10.0.4.138/31	10.0.4.138 – 10.0.4.139	10.0.4.139
71	10.0.4.140/31	10.0.4.140 – 10.0.4.141	10.0.4.141
72	10.0.4.142/31	10.0.4.142 – 10.0.4.143	10.0.4.143
73	10.0.4.144/31	10.0.4.144 – 10.0.4.145	10.0.4.145
74	10.0.4.146/31	10.0.4.146 – 10.0.4.147	10.0.4.147
75	10.0.4.148/31	10.0.4.148 – 10.0.4.149	10.0.4.149
76	10.0.4.150/31	10.0.4.150 – 10.0.4.151	10.0.4.151
77	10.0.4.152/31	10.0.4.152 – 10.0.4.153	10.0.4.153
78	10.0.4.154/31	10.0.4.154 – 10.0.4.155	10.0.4.155
79	10.0.4.156/31	10.0.4.156 – 10.0.4.157	10.0.4.157
80	10.0.4.158/31	10.0.4.158 – 10.0.4.159	10.0.4.159
81	10.0.4.160/31	10.0.4.160 – 10.0.4.161	10.0.4.161
82	10.0.4.162/31	10.0.4.162 – 10.0.4.163	10.0.4.163
83	10.0.4.164/31	10.0.4.164 – 10.0.4.165	10.0.4.165
84	10.0.4.166/31	10.0.4.166 – 10.0.4.167	10.0.4.167
85	10.0.4.168/31	10.0.4.168 – 10.0.4.169	10.0.4.169
86	10.0.4.170/31	10.0.4.170 – 10.0.4.171	10.0.4.171
87	10.0.4.172/31	10.0.4.172 – 10.0.4.173	10.0.4.173
88	10.0.4.174/31	10.0.4.174 – 10.0.4.175	10.0.4.175
89	10.0.4.176/31	10.0.4.176 – 10.0.4.177	10.0.4.177
90	10.0.4.178/31	10.0.4.178 – 10.0.4.179	10.0.4.179
91	10.0.4.180/31	10.0.4.180 – 10.0.4.181	10.0.4.181
92	10.0.4.182/31	10.0.4.182 – 10.0.4.183	10.0.4.183
93	10.0.4.184/31	10.0.4.184 – 10.0.4.185	10.0.4.185
94	10.0.4.186/31	10.0.4.186 – 10.0.4.187	10.0.4.187
95	10.0.4.188/31	10.0.4.188 – 10.0.4.189	10.0.4.189
96	10.0.4.190/31	10.0.4.190 – 10.0.4.191	10.0.4.191
97	10.0.4.192/31	10.0.4.192 – 10.0.4.193	10.0.4.193
98	10.0.4.194/31	10.0.4.194 – 10.0.4.195	10.0.4.195
99	10.0.4.196/31	10.0.4.196 – 10.0.4.197	10.0.4.197
100	10.0.4.198/31	10.0.4.198 – 10.0.4.199	10.0.4.199
101	10.0.4.200/31	10.0.4.200 – 10.0.4.201	10.0.4.201
102	10.0.4.202/31	10.0.4.202 – 10.0.4.203	10.0.4.203
103	10.0.4.204/31	10.0.4.204 – 10.0.4.205	10.0.4.205
104	10.0.4.206/31	10.0.4.206 – 10.0.4.207	10.0.4.207
105	10.0.4.208/31	10.0.4.208 – 10.0.4.209	10.0.4.209
106	10.0.4.210/31	10.0.4.210 – 10.0.4.211	10.0.4.211
107	10.0.4.212/31	10.0.4.212 – 10.0.4.213	10.0.4.213
108	10.0.4.214/31	10.0.4.214 – 10.0.4.215	10.0.4.215
109	10.0.4.216/31	10.0.4.216 – 10.0.4.217	10.0.4.217
110	10.0.4.218/31	10.0.4.218 – 10.0.4.219	10.0.4.219
111	10.0.4.220/31	10.0.4.220 – 10.0.4.221	10.0.4.221
112	10.0.4.222/31	10.0.4.222 – 10.0.4.223	10.0.4.223
113	10.0.4.224/31	10.0.4.224 – 10.0.4.225	10.0.4.225
114	10.0.4.226/31	10.0.4.226 – 10.0.4.227	10.0.4.227
115	10.0.4.228/31	10.0.4.228 – 10.0.4.229	10.0.4.229
116	10.0.4.230/31	10.0.4.230 – 10.0.4.231	10.0.4.231
117	10.0.4.232/31	10.0.4.232 – 10.0.4.233	10.0.4.233
118	10.0.4.234/31	10.0.4.234 – 10.0.4.235	10.0.4.235
119	10.0.4.236/31	10.0.4.236 – 10.0.4.237	10.0.4.237
120	10.0.4.238/31	10.0.4.238 – 10.0.4.239	10.0.4.239
121	10.0.4.240/31	10.0.4.240 – 10.0.4.241	10.0.4.241
122	10.0.4.242/31	10.0.4.242 – 10.0.4.243	10.0.4.243
123	10.0.4.244/31	10.0.4.244 – 10.0.4.245	10.0.4.245
124	10.0.4.246/31	10.0.4.246 – 10.0.4.247	10.0.4.247
125	10.0.4.248/31	10.0.4.248 – 10.0.4.249	10.0.4.249
126	10.0.4.250/31	10.0.4.250 – 10.0.4.251	10.0.4.251
127	10.0.4.252/31	10.0.4.252 – 10.0.4.253	10.0.4.253
128	10.0.4.254/31	10.0.4.254 – 10.0.4.255	10.0.4.255

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 →