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)10.3.75.0/24

network10.3.75.0/24

broadcast10.3.75.255

first host10.3.75.1

last host10.3.75.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.75.0/24

address00001010.00000011.01001011.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.01001011.00000000

broadcast00001010.00000011.01001011.11111111

green = network part, grey = host part

hex0x0a034b00

decimal167987968

reverse dns0.75.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:4b00

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.75.0/31	10.3.75.0 – 10.3.75.1	10.3.75.1
2	10.3.75.2/31	10.3.75.2 – 10.3.75.3	10.3.75.3
3	10.3.75.4/31	10.3.75.4 – 10.3.75.5	10.3.75.5
4	10.3.75.6/31	10.3.75.6 – 10.3.75.7	10.3.75.7
5	10.3.75.8/31	10.3.75.8 – 10.3.75.9	10.3.75.9
6	10.3.75.10/31	10.3.75.10 – 10.3.75.11	10.3.75.11
7	10.3.75.12/31	10.3.75.12 – 10.3.75.13	10.3.75.13
8	10.3.75.14/31	10.3.75.14 – 10.3.75.15	10.3.75.15
9	10.3.75.16/31	10.3.75.16 – 10.3.75.17	10.3.75.17
10	10.3.75.18/31	10.3.75.18 – 10.3.75.19	10.3.75.19
11	10.3.75.20/31	10.3.75.20 – 10.3.75.21	10.3.75.21
12	10.3.75.22/31	10.3.75.22 – 10.3.75.23	10.3.75.23
13	10.3.75.24/31	10.3.75.24 – 10.3.75.25	10.3.75.25
14	10.3.75.26/31	10.3.75.26 – 10.3.75.27	10.3.75.27
15	10.3.75.28/31	10.3.75.28 – 10.3.75.29	10.3.75.29
16	10.3.75.30/31	10.3.75.30 – 10.3.75.31	10.3.75.31
17	10.3.75.32/31	10.3.75.32 – 10.3.75.33	10.3.75.33
18	10.3.75.34/31	10.3.75.34 – 10.3.75.35	10.3.75.35
19	10.3.75.36/31	10.3.75.36 – 10.3.75.37	10.3.75.37
20	10.3.75.38/31	10.3.75.38 – 10.3.75.39	10.3.75.39
21	10.3.75.40/31	10.3.75.40 – 10.3.75.41	10.3.75.41
22	10.3.75.42/31	10.3.75.42 – 10.3.75.43	10.3.75.43
23	10.3.75.44/31	10.3.75.44 – 10.3.75.45	10.3.75.45
24	10.3.75.46/31	10.3.75.46 – 10.3.75.47	10.3.75.47
25	10.3.75.48/31	10.3.75.48 – 10.3.75.49	10.3.75.49
26	10.3.75.50/31	10.3.75.50 – 10.3.75.51	10.3.75.51
27	10.3.75.52/31	10.3.75.52 – 10.3.75.53	10.3.75.53
28	10.3.75.54/31	10.3.75.54 – 10.3.75.55	10.3.75.55
29	10.3.75.56/31	10.3.75.56 – 10.3.75.57	10.3.75.57
30	10.3.75.58/31	10.3.75.58 – 10.3.75.59	10.3.75.59
31	10.3.75.60/31	10.3.75.60 – 10.3.75.61	10.3.75.61
32	10.3.75.62/31	10.3.75.62 – 10.3.75.63	10.3.75.63
33	10.3.75.64/31	10.3.75.64 – 10.3.75.65	10.3.75.65
34	10.3.75.66/31	10.3.75.66 – 10.3.75.67	10.3.75.67
35	10.3.75.68/31	10.3.75.68 – 10.3.75.69	10.3.75.69
36	10.3.75.70/31	10.3.75.70 – 10.3.75.71	10.3.75.71
37	10.3.75.72/31	10.3.75.72 – 10.3.75.73	10.3.75.73
38	10.3.75.74/31	10.3.75.74 – 10.3.75.75	10.3.75.75
39	10.3.75.76/31	10.3.75.76 – 10.3.75.77	10.3.75.77
40	10.3.75.78/31	10.3.75.78 – 10.3.75.79	10.3.75.79
41	10.3.75.80/31	10.3.75.80 – 10.3.75.81	10.3.75.81
42	10.3.75.82/31	10.3.75.82 – 10.3.75.83	10.3.75.83
43	10.3.75.84/31	10.3.75.84 – 10.3.75.85	10.3.75.85
44	10.3.75.86/31	10.3.75.86 – 10.3.75.87	10.3.75.87
45	10.3.75.88/31	10.3.75.88 – 10.3.75.89	10.3.75.89
46	10.3.75.90/31	10.3.75.90 – 10.3.75.91	10.3.75.91
47	10.3.75.92/31	10.3.75.92 – 10.3.75.93	10.3.75.93
48	10.3.75.94/31	10.3.75.94 – 10.3.75.95	10.3.75.95
49	10.3.75.96/31	10.3.75.96 – 10.3.75.97	10.3.75.97
50	10.3.75.98/31	10.3.75.98 – 10.3.75.99	10.3.75.99
51	10.3.75.100/31	10.3.75.100 – 10.3.75.101	10.3.75.101
52	10.3.75.102/31	10.3.75.102 – 10.3.75.103	10.3.75.103
53	10.3.75.104/31	10.3.75.104 – 10.3.75.105	10.3.75.105
54	10.3.75.106/31	10.3.75.106 – 10.3.75.107	10.3.75.107
55	10.3.75.108/31	10.3.75.108 – 10.3.75.109	10.3.75.109
56	10.3.75.110/31	10.3.75.110 – 10.3.75.111	10.3.75.111
57	10.3.75.112/31	10.3.75.112 – 10.3.75.113	10.3.75.113
58	10.3.75.114/31	10.3.75.114 – 10.3.75.115	10.3.75.115
59	10.3.75.116/31	10.3.75.116 – 10.3.75.117	10.3.75.117
60	10.3.75.118/31	10.3.75.118 – 10.3.75.119	10.3.75.119
61	10.3.75.120/31	10.3.75.120 – 10.3.75.121	10.3.75.121
62	10.3.75.122/31	10.3.75.122 – 10.3.75.123	10.3.75.123
63	10.3.75.124/31	10.3.75.124 – 10.3.75.125	10.3.75.125
64	10.3.75.126/31	10.3.75.126 – 10.3.75.127	10.3.75.127
65	10.3.75.128/31	10.3.75.128 – 10.3.75.129	10.3.75.129
66	10.3.75.130/31	10.3.75.130 – 10.3.75.131	10.3.75.131
67	10.3.75.132/31	10.3.75.132 – 10.3.75.133	10.3.75.133
68	10.3.75.134/31	10.3.75.134 – 10.3.75.135	10.3.75.135
69	10.3.75.136/31	10.3.75.136 – 10.3.75.137	10.3.75.137
70	10.3.75.138/31	10.3.75.138 – 10.3.75.139	10.3.75.139
71	10.3.75.140/31	10.3.75.140 – 10.3.75.141	10.3.75.141
72	10.3.75.142/31	10.3.75.142 – 10.3.75.143	10.3.75.143
73	10.3.75.144/31	10.3.75.144 – 10.3.75.145	10.3.75.145
74	10.3.75.146/31	10.3.75.146 – 10.3.75.147	10.3.75.147
75	10.3.75.148/31	10.3.75.148 – 10.3.75.149	10.3.75.149
76	10.3.75.150/31	10.3.75.150 – 10.3.75.151	10.3.75.151
77	10.3.75.152/31	10.3.75.152 – 10.3.75.153	10.3.75.153
78	10.3.75.154/31	10.3.75.154 – 10.3.75.155	10.3.75.155
79	10.3.75.156/31	10.3.75.156 – 10.3.75.157	10.3.75.157
80	10.3.75.158/31	10.3.75.158 – 10.3.75.159	10.3.75.159
81	10.3.75.160/31	10.3.75.160 – 10.3.75.161	10.3.75.161
82	10.3.75.162/31	10.3.75.162 – 10.3.75.163	10.3.75.163
83	10.3.75.164/31	10.3.75.164 – 10.3.75.165	10.3.75.165
84	10.3.75.166/31	10.3.75.166 – 10.3.75.167	10.3.75.167
85	10.3.75.168/31	10.3.75.168 – 10.3.75.169	10.3.75.169
86	10.3.75.170/31	10.3.75.170 – 10.3.75.171	10.3.75.171
87	10.3.75.172/31	10.3.75.172 – 10.3.75.173	10.3.75.173
88	10.3.75.174/31	10.3.75.174 – 10.3.75.175	10.3.75.175
89	10.3.75.176/31	10.3.75.176 – 10.3.75.177	10.3.75.177
90	10.3.75.178/31	10.3.75.178 – 10.3.75.179	10.3.75.179
91	10.3.75.180/31	10.3.75.180 – 10.3.75.181	10.3.75.181
92	10.3.75.182/31	10.3.75.182 – 10.3.75.183	10.3.75.183
93	10.3.75.184/31	10.3.75.184 – 10.3.75.185	10.3.75.185
94	10.3.75.186/31	10.3.75.186 – 10.3.75.187	10.3.75.187
95	10.3.75.188/31	10.3.75.188 – 10.3.75.189	10.3.75.189
96	10.3.75.190/31	10.3.75.190 – 10.3.75.191	10.3.75.191
97	10.3.75.192/31	10.3.75.192 – 10.3.75.193	10.3.75.193
98	10.3.75.194/31	10.3.75.194 – 10.3.75.195	10.3.75.195
99	10.3.75.196/31	10.3.75.196 – 10.3.75.197	10.3.75.197
100	10.3.75.198/31	10.3.75.198 – 10.3.75.199	10.3.75.199
101	10.3.75.200/31	10.3.75.200 – 10.3.75.201	10.3.75.201
102	10.3.75.202/31	10.3.75.202 – 10.3.75.203	10.3.75.203
103	10.3.75.204/31	10.3.75.204 – 10.3.75.205	10.3.75.205
104	10.3.75.206/31	10.3.75.206 – 10.3.75.207	10.3.75.207
105	10.3.75.208/31	10.3.75.208 – 10.3.75.209	10.3.75.209
106	10.3.75.210/31	10.3.75.210 – 10.3.75.211	10.3.75.211
107	10.3.75.212/31	10.3.75.212 – 10.3.75.213	10.3.75.213
108	10.3.75.214/31	10.3.75.214 – 10.3.75.215	10.3.75.215
109	10.3.75.216/31	10.3.75.216 – 10.3.75.217	10.3.75.217
110	10.3.75.218/31	10.3.75.218 – 10.3.75.219	10.3.75.219
111	10.3.75.220/31	10.3.75.220 – 10.3.75.221	10.3.75.221
112	10.3.75.222/31	10.3.75.222 – 10.3.75.223	10.3.75.223
113	10.3.75.224/31	10.3.75.224 – 10.3.75.225	10.3.75.225
114	10.3.75.226/31	10.3.75.226 – 10.3.75.227	10.3.75.227
115	10.3.75.228/31	10.3.75.228 – 10.3.75.229	10.3.75.229
116	10.3.75.230/31	10.3.75.230 – 10.3.75.231	10.3.75.231
117	10.3.75.232/31	10.3.75.232 – 10.3.75.233	10.3.75.233
118	10.3.75.234/31	10.3.75.234 – 10.3.75.235	10.3.75.235
119	10.3.75.236/31	10.3.75.236 – 10.3.75.237	10.3.75.237
120	10.3.75.238/31	10.3.75.238 – 10.3.75.239	10.3.75.239
121	10.3.75.240/31	10.3.75.240 – 10.3.75.241	10.3.75.241
122	10.3.75.242/31	10.3.75.242 – 10.3.75.243	10.3.75.243
123	10.3.75.244/31	10.3.75.244 – 10.3.75.245	10.3.75.245
124	10.3.75.246/31	10.3.75.246 – 10.3.75.247	10.3.75.247
125	10.3.75.248/31	10.3.75.248 – 10.3.75.249	10.3.75.249
126	10.3.75.250/31	10.3.75.250 – 10.3.75.251	10.3.75.251
127	10.3.75.252/31	10.3.75.252 – 10.3.75.253	10.3.75.253
128	10.3.75.254/31	10.3.75.254 – 10.3.75.255	10.3.75.255

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 →