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)10.4.28.0/24

network10.4.28.0/24

broadcast10.4.28.255

first host10.4.28.1

last host10.4.28.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.4.28.0/24

address00001010.00000100.00011100.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000100.00011100.00000000

broadcast00001010.00000100.00011100.11111111

green = network part, grey = host part

hex0x0a041c00

decimal168041472

reverse dns0.28.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:1c00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.4.28.0/31	10.4.28.0 – 10.4.28.1	10.4.28.1
2	10.4.28.2/31	10.4.28.2 – 10.4.28.3	10.4.28.3
3	10.4.28.4/31	10.4.28.4 – 10.4.28.5	10.4.28.5
4	10.4.28.6/31	10.4.28.6 – 10.4.28.7	10.4.28.7
5	10.4.28.8/31	10.4.28.8 – 10.4.28.9	10.4.28.9
6	10.4.28.10/31	10.4.28.10 – 10.4.28.11	10.4.28.11
7	10.4.28.12/31	10.4.28.12 – 10.4.28.13	10.4.28.13
8	10.4.28.14/31	10.4.28.14 – 10.4.28.15	10.4.28.15
9	10.4.28.16/31	10.4.28.16 – 10.4.28.17	10.4.28.17
10	10.4.28.18/31	10.4.28.18 – 10.4.28.19	10.4.28.19
11	10.4.28.20/31	10.4.28.20 – 10.4.28.21	10.4.28.21
12	10.4.28.22/31	10.4.28.22 – 10.4.28.23	10.4.28.23
13	10.4.28.24/31	10.4.28.24 – 10.4.28.25	10.4.28.25
14	10.4.28.26/31	10.4.28.26 – 10.4.28.27	10.4.28.27
15	10.4.28.28/31	10.4.28.28 – 10.4.28.29	10.4.28.29
16	10.4.28.30/31	10.4.28.30 – 10.4.28.31	10.4.28.31
17	10.4.28.32/31	10.4.28.32 – 10.4.28.33	10.4.28.33
18	10.4.28.34/31	10.4.28.34 – 10.4.28.35	10.4.28.35
19	10.4.28.36/31	10.4.28.36 – 10.4.28.37	10.4.28.37
20	10.4.28.38/31	10.4.28.38 – 10.4.28.39	10.4.28.39
21	10.4.28.40/31	10.4.28.40 – 10.4.28.41	10.4.28.41
22	10.4.28.42/31	10.4.28.42 – 10.4.28.43	10.4.28.43
23	10.4.28.44/31	10.4.28.44 – 10.4.28.45	10.4.28.45
24	10.4.28.46/31	10.4.28.46 – 10.4.28.47	10.4.28.47
25	10.4.28.48/31	10.4.28.48 – 10.4.28.49	10.4.28.49
26	10.4.28.50/31	10.4.28.50 – 10.4.28.51	10.4.28.51
27	10.4.28.52/31	10.4.28.52 – 10.4.28.53	10.4.28.53
28	10.4.28.54/31	10.4.28.54 – 10.4.28.55	10.4.28.55
29	10.4.28.56/31	10.4.28.56 – 10.4.28.57	10.4.28.57
30	10.4.28.58/31	10.4.28.58 – 10.4.28.59	10.4.28.59
31	10.4.28.60/31	10.4.28.60 – 10.4.28.61	10.4.28.61
32	10.4.28.62/31	10.4.28.62 – 10.4.28.63	10.4.28.63
33	10.4.28.64/31	10.4.28.64 – 10.4.28.65	10.4.28.65
34	10.4.28.66/31	10.4.28.66 – 10.4.28.67	10.4.28.67
35	10.4.28.68/31	10.4.28.68 – 10.4.28.69	10.4.28.69
36	10.4.28.70/31	10.4.28.70 – 10.4.28.71	10.4.28.71
37	10.4.28.72/31	10.4.28.72 – 10.4.28.73	10.4.28.73
38	10.4.28.74/31	10.4.28.74 – 10.4.28.75	10.4.28.75
39	10.4.28.76/31	10.4.28.76 – 10.4.28.77	10.4.28.77
40	10.4.28.78/31	10.4.28.78 – 10.4.28.79	10.4.28.79
41	10.4.28.80/31	10.4.28.80 – 10.4.28.81	10.4.28.81
42	10.4.28.82/31	10.4.28.82 – 10.4.28.83	10.4.28.83
43	10.4.28.84/31	10.4.28.84 – 10.4.28.85	10.4.28.85
44	10.4.28.86/31	10.4.28.86 – 10.4.28.87	10.4.28.87
45	10.4.28.88/31	10.4.28.88 – 10.4.28.89	10.4.28.89
46	10.4.28.90/31	10.4.28.90 – 10.4.28.91	10.4.28.91
47	10.4.28.92/31	10.4.28.92 – 10.4.28.93	10.4.28.93
48	10.4.28.94/31	10.4.28.94 – 10.4.28.95	10.4.28.95
49	10.4.28.96/31	10.4.28.96 – 10.4.28.97	10.4.28.97
50	10.4.28.98/31	10.4.28.98 – 10.4.28.99	10.4.28.99
51	10.4.28.100/31	10.4.28.100 – 10.4.28.101	10.4.28.101
52	10.4.28.102/31	10.4.28.102 – 10.4.28.103	10.4.28.103
53	10.4.28.104/31	10.4.28.104 – 10.4.28.105	10.4.28.105
54	10.4.28.106/31	10.4.28.106 – 10.4.28.107	10.4.28.107
55	10.4.28.108/31	10.4.28.108 – 10.4.28.109	10.4.28.109
56	10.4.28.110/31	10.4.28.110 – 10.4.28.111	10.4.28.111
57	10.4.28.112/31	10.4.28.112 – 10.4.28.113	10.4.28.113
58	10.4.28.114/31	10.4.28.114 – 10.4.28.115	10.4.28.115
59	10.4.28.116/31	10.4.28.116 – 10.4.28.117	10.4.28.117
60	10.4.28.118/31	10.4.28.118 – 10.4.28.119	10.4.28.119
61	10.4.28.120/31	10.4.28.120 – 10.4.28.121	10.4.28.121
62	10.4.28.122/31	10.4.28.122 – 10.4.28.123	10.4.28.123
63	10.4.28.124/31	10.4.28.124 – 10.4.28.125	10.4.28.125
64	10.4.28.126/31	10.4.28.126 – 10.4.28.127	10.4.28.127
65	10.4.28.128/31	10.4.28.128 – 10.4.28.129	10.4.28.129
66	10.4.28.130/31	10.4.28.130 – 10.4.28.131	10.4.28.131
67	10.4.28.132/31	10.4.28.132 – 10.4.28.133	10.4.28.133
68	10.4.28.134/31	10.4.28.134 – 10.4.28.135	10.4.28.135
69	10.4.28.136/31	10.4.28.136 – 10.4.28.137	10.4.28.137
70	10.4.28.138/31	10.4.28.138 – 10.4.28.139	10.4.28.139
71	10.4.28.140/31	10.4.28.140 – 10.4.28.141	10.4.28.141
72	10.4.28.142/31	10.4.28.142 – 10.4.28.143	10.4.28.143
73	10.4.28.144/31	10.4.28.144 – 10.4.28.145	10.4.28.145
74	10.4.28.146/31	10.4.28.146 – 10.4.28.147	10.4.28.147
75	10.4.28.148/31	10.4.28.148 – 10.4.28.149	10.4.28.149
76	10.4.28.150/31	10.4.28.150 – 10.4.28.151	10.4.28.151
77	10.4.28.152/31	10.4.28.152 – 10.4.28.153	10.4.28.153
78	10.4.28.154/31	10.4.28.154 – 10.4.28.155	10.4.28.155
79	10.4.28.156/31	10.4.28.156 – 10.4.28.157	10.4.28.157
80	10.4.28.158/31	10.4.28.158 – 10.4.28.159	10.4.28.159
81	10.4.28.160/31	10.4.28.160 – 10.4.28.161	10.4.28.161
82	10.4.28.162/31	10.4.28.162 – 10.4.28.163	10.4.28.163
83	10.4.28.164/31	10.4.28.164 – 10.4.28.165	10.4.28.165
84	10.4.28.166/31	10.4.28.166 – 10.4.28.167	10.4.28.167
85	10.4.28.168/31	10.4.28.168 – 10.4.28.169	10.4.28.169
86	10.4.28.170/31	10.4.28.170 – 10.4.28.171	10.4.28.171
87	10.4.28.172/31	10.4.28.172 – 10.4.28.173	10.4.28.173
88	10.4.28.174/31	10.4.28.174 – 10.4.28.175	10.4.28.175
89	10.4.28.176/31	10.4.28.176 – 10.4.28.177	10.4.28.177
90	10.4.28.178/31	10.4.28.178 – 10.4.28.179	10.4.28.179
91	10.4.28.180/31	10.4.28.180 – 10.4.28.181	10.4.28.181
92	10.4.28.182/31	10.4.28.182 – 10.4.28.183	10.4.28.183
93	10.4.28.184/31	10.4.28.184 – 10.4.28.185	10.4.28.185
94	10.4.28.186/31	10.4.28.186 – 10.4.28.187	10.4.28.187
95	10.4.28.188/31	10.4.28.188 – 10.4.28.189	10.4.28.189
96	10.4.28.190/31	10.4.28.190 – 10.4.28.191	10.4.28.191
97	10.4.28.192/31	10.4.28.192 – 10.4.28.193	10.4.28.193
98	10.4.28.194/31	10.4.28.194 – 10.4.28.195	10.4.28.195
99	10.4.28.196/31	10.4.28.196 – 10.4.28.197	10.4.28.197
100	10.4.28.198/31	10.4.28.198 – 10.4.28.199	10.4.28.199
101	10.4.28.200/31	10.4.28.200 – 10.4.28.201	10.4.28.201
102	10.4.28.202/31	10.4.28.202 – 10.4.28.203	10.4.28.203
103	10.4.28.204/31	10.4.28.204 – 10.4.28.205	10.4.28.205
104	10.4.28.206/31	10.4.28.206 – 10.4.28.207	10.4.28.207
105	10.4.28.208/31	10.4.28.208 – 10.4.28.209	10.4.28.209
106	10.4.28.210/31	10.4.28.210 – 10.4.28.211	10.4.28.211
107	10.4.28.212/31	10.4.28.212 – 10.4.28.213	10.4.28.213
108	10.4.28.214/31	10.4.28.214 – 10.4.28.215	10.4.28.215
109	10.4.28.216/31	10.4.28.216 – 10.4.28.217	10.4.28.217
110	10.4.28.218/31	10.4.28.218 – 10.4.28.219	10.4.28.219
111	10.4.28.220/31	10.4.28.220 – 10.4.28.221	10.4.28.221
112	10.4.28.222/31	10.4.28.222 – 10.4.28.223	10.4.28.223
113	10.4.28.224/31	10.4.28.224 – 10.4.28.225	10.4.28.225
114	10.4.28.226/31	10.4.28.226 – 10.4.28.227	10.4.28.227
115	10.4.28.228/31	10.4.28.228 – 10.4.28.229	10.4.28.229
116	10.4.28.230/31	10.4.28.230 – 10.4.28.231	10.4.28.231
117	10.4.28.232/31	10.4.28.232 – 10.4.28.233	10.4.28.233
118	10.4.28.234/31	10.4.28.234 – 10.4.28.235	10.4.28.235
119	10.4.28.236/31	10.4.28.236 – 10.4.28.237	10.4.28.237
120	10.4.28.238/31	10.4.28.238 – 10.4.28.239	10.4.28.239
121	10.4.28.240/31	10.4.28.240 – 10.4.28.241	10.4.28.241
122	10.4.28.242/31	10.4.28.242 – 10.4.28.243	10.4.28.243
123	10.4.28.244/31	10.4.28.244 – 10.4.28.245	10.4.28.245
124	10.4.28.246/31	10.4.28.246 – 10.4.28.247	10.4.28.247
125	10.4.28.248/31	10.4.28.248 – 10.4.28.249	10.4.28.249
126	10.4.28.250/31	10.4.28.250 – 10.4.28.251	10.4.28.251
127	10.4.28.252/31	10.4.28.252 – 10.4.28.253	10.4.28.253
128	10.4.28.254/31	10.4.28.254 – 10.4.28.255	10.4.28.255

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 →