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)10.3.23.0/24

network10.3.23.0/24

broadcast10.3.23.255

first host10.3.23.1

last host10.3.23.254

subnet mask255.255.255.0

wildcard0.0.0.255

addresses256

usable hosts254

classA

ipcalc 10.3.23.0/24

address00001010.00000011.00010111.00000000

subnet mask11111111.11111111.11111111.00000000

network00001010.00000011.00010111.00000000

broadcast00001010.00000011.00010111.11111111

green = network part, grey = host part

hex0x0a031700

decimal167974656

reverse dns0.23.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:1700

/24 split into /31 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.23.0/31	10.3.23.0 – 10.3.23.1	10.3.23.1
2	10.3.23.2/31	10.3.23.2 – 10.3.23.3	10.3.23.3
3	10.3.23.4/31	10.3.23.4 – 10.3.23.5	10.3.23.5
4	10.3.23.6/31	10.3.23.6 – 10.3.23.7	10.3.23.7
5	10.3.23.8/31	10.3.23.8 – 10.3.23.9	10.3.23.9
6	10.3.23.10/31	10.3.23.10 – 10.3.23.11	10.3.23.11
7	10.3.23.12/31	10.3.23.12 – 10.3.23.13	10.3.23.13
8	10.3.23.14/31	10.3.23.14 – 10.3.23.15	10.3.23.15
9	10.3.23.16/31	10.3.23.16 – 10.3.23.17	10.3.23.17
10	10.3.23.18/31	10.3.23.18 – 10.3.23.19	10.3.23.19
11	10.3.23.20/31	10.3.23.20 – 10.3.23.21	10.3.23.21
12	10.3.23.22/31	10.3.23.22 – 10.3.23.23	10.3.23.23
13	10.3.23.24/31	10.3.23.24 – 10.3.23.25	10.3.23.25
14	10.3.23.26/31	10.3.23.26 – 10.3.23.27	10.3.23.27
15	10.3.23.28/31	10.3.23.28 – 10.3.23.29	10.3.23.29
16	10.3.23.30/31	10.3.23.30 – 10.3.23.31	10.3.23.31
17	10.3.23.32/31	10.3.23.32 – 10.3.23.33	10.3.23.33
18	10.3.23.34/31	10.3.23.34 – 10.3.23.35	10.3.23.35
19	10.3.23.36/31	10.3.23.36 – 10.3.23.37	10.3.23.37
20	10.3.23.38/31	10.3.23.38 – 10.3.23.39	10.3.23.39
21	10.3.23.40/31	10.3.23.40 – 10.3.23.41	10.3.23.41
22	10.3.23.42/31	10.3.23.42 – 10.3.23.43	10.3.23.43
23	10.3.23.44/31	10.3.23.44 – 10.3.23.45	10.3.23.45
24	10.3.23.46/31	10.3.23.46 – 10.3.23.47	10.3.23.47
25	10.3.23.48/31	10.3.23.48 – 10.3.23.49	10.3.23.49
26	10.3.23.50/31	10.3.23.50 – 10.3.23.51	10.3.23.51
27	10.3.23.52/31	10.3.23.52 – 10.3.23.53	10.3.23.53
28	10.3.23.54/31	10.3.23.54 – 10.3.23.55	10.3.23.55
29	10.3.23.56/31	10.3.23.56 – 10.3.23.57	10.3.23.57
30	10.3.23.58/31	10.3.23.58 – 10.3.23.59	10.3.23.59
31	10.3.23.60/31	10.3.23.60 – 10.3.23.61	10.3.23.61
32	10.3.23.62/31	10.3.23.62 – 10.3.23.63	10.3.23.63
33	10.3.23.64/31	10.3.23.64 – 10.3.23.65	10.3.23.65
34	10.3.23.66/31	10.3.23.66 – 10.3.23.67	10.3.23.67
35	10.3.23.68/31	10.3.23.68 – 10.3.23.69	10.3.23.69
36	10.3.23.70/31	10.3.23.70 – 10.3.23.71	10.3.23.71
37	10.3.23.72/31	10.3.23.72 – 10.3.23.73	10.3.23.73
38	10.3.23.74/31	10.3.23.74 – 10.3.23.75	10.3.23.75
39	10.3.23.76/31	10.3.23.76 – 10.3.23.77	10.3.23.77
40	10.3.23.78/31	10.3.23.78 – 10.3.23.79	10.3.23.79
41	10.3.23.80/31	10.3.23.80 – 10.3.23.81	10.3.23.81
42	10.3.23.82/31	10.3.23.82 – 10.3.23.83	10.3.23.83
43	10.3.23.84/31	10.3.23.84 – 10.3.23.85	10.3.23.85
44	10.3.23.86/31	10.3.23.86 – 10.3.23.87	10.3.23.87
45	10.3.23.88/31	10.3.23.88 – 10.3.23.89	10.3.23.89
46	10.3.23.90/31	10.3.23.90 – 10.3.23.91	10.3.23.91
47	10.3.23.92/31	10.3.23.92 – 10.3.23.93	10.3.23.93
48	10.3.23.94/31	10.3.23.94 – 10.3.23.95	10.3.23.95
49	10.3.23.96/31	10.3.23.96 – 10.3.23.97	10.3.23.97
50	10.3.23.98/31	10.3.23.98 – 10.3.23.99	10.3.23.99
51	10.3.23.100/31	10.3.23.100 – 10.3.23.101	10.3.23.101
52	10.3.23.102/31	10.3.23.102 – 10.3.23.103	10.3.23.103
53	10.3.23.104/31	10.3.23.104 – 10.3.23.105	10.3.23.105
54	10.3.23.106/31	10.3.23.106 – 10.3.23.107	10.3.23.107
55	10.3.23.108/31	10.3.23.108 – 10.3.23.109	10.3.23.109
56	10.3.23.110/31	10.3.23.110 – 10.3.23.111	10.3.23.111
57	10.3.23.112/31	10.3.23.112 – 10.3.23.113	10.3.23.113
58	10.3.23.114/31	10.3.23.114 – 10.3.23.115	10.3.23.115
59	10.3.23.116/31	10.3.23.116 – 10.3.23.117	10.3.23.117
60	10.3.23.118/31	10.3.23.118 – 10.3.23.119	10.3.23.119
61	10.3.23.120/31	10.3.23.120 – 10.3.23.121	10.3.23.121
62	10.3.23.122/31	10.3.23.122 – 10.3.23.123	10.3.23.123
63	10.3.23.124/31	10.3.23.124 – 10.3.23.125	10.3.23.125
64	10.3.23.126/31	10.3.23.126 – 10.3.23.127	10.3.23.127
65	10.3.23.128/31	10.3.23.128 – 10.3.23.129	10.3.23.129
66	10.3.23.130/31	10.3.23.130 – 10.3.23.131	10.3.23.131
67	10.3.23.132/31	10.3.23.132 – 10.3.23.133	10.3.23.133
68	10.3.23.134/31	10.3.23.134 – 10.3.23.135	10.3.23.135
69	10.3.23.136/31	10.3.23.136 – 10.3.23.137	10.3.23.137
70	10.3.23.138/31	10.3.23.138 – 10.3.23.139	10.3.23.139
71	10.3.23.140/31	10.3.23.140 – 10.3.23.141	10.3.23.141
72	10.3.23.142/31	10.3.23.142 – 10.3.23.143	10.3.23.143
73	10.3.23.144/31	10.3.23.144 – 10.3.23.145	10.3.23.145
74	10.3.23.146/31	10.3.23.146 – 10.3.23.147	10.3.23.147
75	10.3.23.148/31	10.3.23.148 – 10.3.23.149	10.3.23.149
76	10.3.23.150/31	10.3.23.150 – 10.3.23.151	10.3.23.151
77	10.3.23.152/31	10.3.23.152 – 10.3.23.153	10.3.23.153
78	10.3.23.154/31	10.3.23.154 – 10.3.23.155	10.3.23.155
79	10.3.23.156/31	10.3.23.156 – 10.3.23.157	10.3.23.157
80	10.3.23.158/31	10.3.23.158 – 10.3.23.159	10.3.23.159
81	10.3.23.160/31	10.3.23.160 – 10.3.23.161	10.3.23.161
82	10.3.23.162/31	10.3.23.162 – 10.3.23.163	10.3.23.163
83	10.3.23.164/31	10.3.23.164 – 10.3.23.165	10.3.23.165
84	10.3.23.166/31	10.3.23.166 – 10.3.23.167	10.3.23.167
85	10.3.23.168/31	10.3.23.168 – 10.3.23.169	10.3.23.169
86	10.3.23.170/31	10.3.23.170 – 10.3.23.171	10.3.23.171
87	10.3.23.172/31	10.3.23.172 – 10.3.23.173	10.3.23.173
88	10.3.23.174/31	10.3.23.174 – 10.3.23.175	10.3.23.175
89	10.3.23.176/31	10.3.23.176 – 10.3.23.177	10.3.23.177
90	10.3.23.178/31	10.3.23.178 – 10.3.23.179	10.3.23.179
91	10.3.23.180/31	10.3.23.180 – 10.3.23.181	10.3.23.181
92	10.3.23.182/31	10.3.23.182 – 10.3.23.183	10.3.23.183
93	10.3.23.184/31	10.3.23.184 – 10.3.23.185	10.3.23.185
94	10.3.23.186/31	10.3.23.186 – 10.3.23.187	10.3.23.187
95	10.3.23.188/31	10.3.23.188 – 10.3.23.189	10.3.23.189
96	10.3.23.190/31	10.3.23.190 – 10.3.23.191	10.3.23.191
97	10.3.23.192/31	10.3.23.192 – 10.3.23.193	10.3.23.193
98	10.3.23.194/31	10.3.23.194 – 10.3.23.195	10.3.23.195
99	10.3.23.196/31	10.3.23.196 – 10.3.23.197	10.3.23.197
100	10.3.23.198/31	10.3.23.198 – 10.3.23.199	10.3.23.199
101	10.3.23.200/31	10.3.23.200 – 10.3.23.201	10.3.23.201
102	10.3.23.202/31	10.3.23.202 – 10.3.23.203	10.3.23.203
103	10.3.23.204/31	10.3.23.204 – 10.3.23.205	10.3.23.205
104	10.3.23.206/31	10.3.23.206 – 10.3.23.207	10.3.23.207
105	10.3.23.208/31	10.3.23.208 – 10.3.23.209	10.3.23.209
106	10.3.23.210/31	10.3.23.210 – 10.3.23.211	10.3.23.211
107	10.3.23.212/31	10.3.23.212 – 10.3.23.213	10.3.23.213
108	10.3.23.214/31	10.3.23.214 – 10.3.23.215	10.3.23.215
109	10.3.23.216/31	10.3.23.216 – 10.3.23.217	10.3.23.217
110	10.3.23.218/31	10.3.23.218 – 10.3.23.219	10.3.23.219
111	10.3.23.220/31	10.3.23.220 – 10.3.23.221	10.3.23.221
112	10.3.23.222/31	10.3.23.222 – 10.3.23.223	10.3.23.223
113	10.3.23.224/31	10.3.23.224 – 10.3.23.225	10.3.23.225
114	10.3.23.226/31	10.3.23.226 – 10.3.23.227	10.3.23.227
115	10.3.23.228/31	10.3.23.228 – 10.3.23.229	10.3.23.229
116	10.3.23.230/31	10.3.23.230 – 10.3.23.231	10.3.23.231
117	10.3.23.232/31	10.3.23.232 – 10.3.23.233	10.3.23.233
118	10.3.23.234/31	10.3.23.234 – 10.3.23.235	10.3.23.235
119	10.3.23.236/31	10.3.23.236 – 10.3.23.237	10.3.23.237
120	10.3.23.238/31	10.3.23.238 – 10.3.23.239	10.3.23.239
121	10.3.23.240/31	10.3.23.240 – 10.3.23.241	10.3.23.241
122	10.3.23.242/31	10.3.23.242 – 10.3.23.243	10.3.23.243
123	10.3.23.244/31	10.3.23.244 – 10.3.23.245	10.3.23.245
124	10.3.23.246/31	10.3.23.246 – 10.3.23.247	10.3.23.247
125	10.3.23.248/31	10.3.23.248 – 10.3.23.249	10.3.23.249
126	10.3.23.250/31	10.3.23.250 – 10.3.23.251	10.3.23.251
127	10.3.23.252/31	10.3.23.252 – 10.3.23.253	10.3.23.253
128	10.3.23.254/31	10.3.23.254 – 10.3.23.255	10.3.23.255

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 →