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)10.3.112.0/23

network10.3.112.0/23

broadcast10.3.113.255

first host10.3.112.1

last host10.3.113.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.3.112.0/23

address00001010.00000011.01110000.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000011.01110000.00000000

broadcast00001010.00000011.01110001.11111111

green = network part, grey = host part

hex0x0a037000

decimal167997440

reverse dns0.112.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:7000

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.112.0/30	10.3.112.1 – 10.3.112.2	10.3.112.3
2	10.3.112.4/30	10.3.112.5 – 10.3.112.6	10.3.112.7
3	10.3.112.8/30	10.3.112.9 – 10.3.112.10	10.3.112.11
4	10.3.112.12/30	10.3.112.13 – 10.3.112.14	10.3.112.15
5	10.3.112.16/30	10.3.112.17 – 10.3.112.18	10.3.112.19
6	10.3.112.20/30	10.3.112.21 – 10.3.112.22	10.3.112.23
7	10.3.112.24/30	10.3.112.25 – 10.3.112.26	10.3.112.27
8	10.3.112.28/30	10.3.112.29 – 10.3.112.30	10.3.112.31
9	10.3.112.32/30	10.3.112.33 – 10.3.112.34	10.3.112.35
10	10.3.112.36/30	10.3.112.37 – 10.3.112.38	10.3.112.39
11	10.3.112.40/30	10.3.112.41 – 10.3.112.42	10.3.112.43
12	10.3.112.44/30	10.3.112.45 – 10.3.112.46	10.3.112.47
13	10.3.112.48/30	10.3.112.49 – 10.3.112.50	10.3.112.51
14	10.3.112.52/30	10.3.112.53 – 10.3.112.54	10.3.112.55
15	10.3.112.56/30	10.3.112.57 – 10.3.112.58	10.3.112.59
16	10.3.112.60/30	10.3.112.61 – 10.3.112.62	10.3.112.63
17	10.3.112.64/30	10.3.112.65 – 10.3.112.66	10.3.112.67
18	10.3.112.68/30	10.3.112.69 – 10.3.112.70	10.3.112.71
19	10.3.112.72/30	10.3.112.73 – 10.3.112.74	10.3.112.75
20	10.3.112.76/30	10.3.112.77 – 10.3.112.78	10.3.112.79
21	10.3.112.80/30	10.3.112.81 – 10.3.112.82	10.3.112.83
22	10.3.112.84/30	10.3.112.85 – 10.3.112.86	10.3.112.87
23	10.3.112.88/30	10.3.112.89 – 10.3.112.90	10.3.112.91
24	10.3.112.92/30	10.3.112.93 – 10.3.112.94	10.3.112.95
25	10.3.112.96/30	10.3.112.97 – 10.3.112.98	10.3.112.99
26	10.3.112.100/30	10.3.112.101 – 10.3.112.102	10.3.112.103
27	10.3.112.104/30	10.3.112.105 – 10.3.112.106	10.3.112.107
28	10.3.112.108/30	10.3.112.109 – 10.3.112.110	10.3.112.111
29	10.3.112.112/30	10.3.112.113 – 10.3.112.114	10.3.112.115
30	10.3.112.116/30	10.3.112.117 – 10.3.112.118	10.3.112.119
31	10.3.112.120/30	10.3.112.121 – 10.3.112.122	10.3.112.123
32	10.3.112.124/30	10.3.112.125 – 10.3.112.126	10.3.112.127
33	10.3.112.128/30	10.3.112.129 – 10.3.112.130	10.3.112.131
34	10.3.112.132/30	10.3.112.133 – 10.3.112.134	10.3.112.135
35	10.3.112.136/30	10.3.112.137 – 10.3.112.138	10.3.112.139
36	10.3.112.140/30	10.3.112.141 – 10.3.112.142	10.3.112.143
37	10.3.112.144/30	10.3.112.145 – 10.3.112.146	10.3.112.147
38	10.3.112.148/30	10.3.112.149 – 10.3.112.150	10.3.112.151
39	10.3.112.152/30	10.3.112.153 – 10.3.112.154	10.3.112.155
40	10.3.112.156/30	10.3.112.157 – 10.3.112.158	10.3.112.159
41	10.3.112.160/30	10.3.112.161 – 10.3.112.162	10.3.112.163
42	10.3.112.164/30	10.3.112.165 – 10.3.112.166	10.3.112.167
43	10.3.112.168/30	10.3.112.169 – 10.3.112.170	10.3.112.171
44	10.3.112.172/30	10.3.112.173 – 10.3.112.174	10.3.112.175
45	10.3.112.176/30	10.3.112.177 – 10.3.112.178	10.3.112.179
46	10.3.112.180/30	10.3.112.181 – 10.3.112.182	10.3.112.183
47	10.3.112.184/30	10.3.112.185 – 10.3.112.186	10.3.112.187
48	10.3.112.188/30	10.3.112.189 – 10.3.112.190	10.3.112.191
49	10.3.112.192/30	10.3.112.193 – 10.3.112.194	10.3.112.195
50	10.3.112.196/30	10.3.112.197 – 10.3.112.198	10.3.112.199
51	10.3.112.200/30	10.3.112.201 – 10.3.112.202	10.3.112.203
52	10.3.112.204/30	10.3.112.205 – 10.3.112.206	10.3.112.207
53	10.3.112.208/30	10.3.112.209 – 10.3.112.210	10.3.112.211
54	10.3.112.212/30	10.3.112.213 – 10.3.112.214	10.3.112.215
55	10.3.112.216/30	10.3.112.217 – 10.3.112.218	10.3.112.219
56	10.3.112.220/30	10.3.112.221 – 10.3.112.222	10.3.112.223
57	10.3.112.224/30	10.3.112.225 – 10.3.112.226	10.3.112.227
58	10.3.112.228/30	10.3.112.229 – 10.3.112.230	10.3.112.231
59	10.3.112.232/30	10.3.112.233 – 10.3.112.234	10.3.112.235
60	10.3.112.236/30	10.3.112.237 – 10.3.112.238	10.3.112.239
61	10.3.112.240/30	10.3.112.241 – 10.3.112.242	10.3.112.243
62	10.3.112.244/30	10.3.112.245 – 10.3.112.246	10.3.112.247
63	10.3.112.248/30	10.3.112.249 – 10.3.112.250	10.3.112.251
64	10.3.112.252/30	10.3.112.253 – 10.3.112.254	10.3.112.255
65	10.3.113.0/30	10.3.113.1 – 10.3.113.2	10.3.113.3
66	10.3.113.4/30	10.3.113.5 – 10.3.113.6	10.3.113.7
67	10.3.113.8/30	10.3.113.9 – 10.3.113.10	10.3.113.11
68	10.3.113.12/30	10.3.113.13 – 10.3.113.14	10.3.113.15
69	10.3.113.16/30	10.3.113.17 – 10.3.113.18	10.3.113.19
70	10.3.113.20/30	10.3.113.21 – 10.3.113.22	10.3.113.23
71	10.3.113.24/30	10.3.113.25 – 10.3.113.26	10.3.113.27
72	10.3.113.28/30	10.3.113.29 – 10.3.113.30	10.3.113.31
73	10.3.113.32/30	10.3.113.33 – 10.3.113.34	10.3.113.35
74	10.3.113.36/30	10.3.113.37 – 10.3.113.38	10.3.113.39
75	10.3.113.40/30	10.3.113.41 – 10.3.113.42	10.3.113.43
76	10.3.113.44/30	10.3.113.45 – 10.3.113.46	10.3.113.47
77	10.3.113.48/30	10.3.113.49 – 10.3.113.50	10.3.113.51
78	10.3.113.52/30	10.3.113.53 – 10.3.113.54	10.3.113.55
79	10.3.113.56/30	10.3.113.57 – 10.3.113.58	10.3.113.59
80	10.3.113.60/30	10.3.113.61 – 10.3.113.62	10.3.113.63
81	10.3.113.64/30	10.3.113.65 – 10.3.113.66	10.3.113.67
82	10.3.113.68/30	10.3.113.69 – 10.3.113.70	10.3.113.71
83	10.3.113.72/30	10.3.113.73 – 10.3.113.74	10.3.113.75
84	10.3.113.76/30	10.3.113.77 – 10.3.113.78	10.3.113.79
85	10.3.113.80/30	10.3.113.81 – 10.3.113.82	10.3.113.83
86	10.3.113.84/30	10.3.113.85 – 10.3.113.86	10.3.113.87
87	10.3.113.88/30	10.3.113.89 – 10.3.113.90	10.3.113.91
88	10.3.113.92/30	10.3.113.93 – 10.3.113.94	10.3.113.95
89	10.3.113.96/30	10.3.113.97 – 10.3.113.98	10.3.113.99
90	10.3.113.100/30	10.3.113.101 – 10.3.113.102	10.3.113.103
91	10.3.113.104/30	10.3.113.105 – 10.3.113.106	10.3.113.107
92	10.3.113.108/30	10.3.113.109 – 10.3.113.110	10.3.113.111
93	10.3.113.112/30	10.3.113.113 – 10.3.113.114	10.3.113.115
94	10.3.113.116/30	10.3.113.117 – 10.3.113.118	10.3.113.119
95	10.3.113.120/30	10.3.113.121 – 10.3.113.122	10.3.113.123
96	10.3.113.124/30	10.3.113.125 – 10.3.113.126	10.3.113.127
97	10.3.113.128/30	10.3.113.129 – 10.3.113.130	10.3.113.131
98	10.3.113.132/30	10.3.113.133 – 10.3.113.134	10.3.113.135
99	10.3.113.136/30	10.3.113.137 – 10.3.113.138	10.3.113.139
100	10.3.113.140/30	10.3.113.141 – 10.3.113.142	10.3.113.143
101	10.3.113.144/30	10.3.113.145 – 10.3.113.146	10.3.113.147
102	10.3.113.148/30	10.3.113.149 – 10.3.113.150	10.3.113.151
103	10.3.113.152/30	10.3.113.153 – 10.3.113.154	10.3.113.155
104	10.3.113.156/30	10.3.113.157 – 10.3.113.158	10.3.113.159
105	10.3.113.160/30	10.3.113.161 – 10.3.113.162	10.3.113.163
106	10.3.113.164/30	10.3.113.165 – 10.3.113.166	10.3.113.167
107	10.3.113.168/30	10.3.113.169 – 10.3.113.170	10.3.113.171
108	10.3.113.172/30	10.3.113.173 – 10.3.113.174	10.3.113.175
109	10.3.113.176/30	10.3.113.177 – 10.3.113.178	10.3.113.179
110	10.3.113.180/30	10.3.113.181 – 10.3.113.182	10.3.113.183
111	10.3.113.184/30	10.3.113.185 – 10.3.113.186	10.3.113.187
112	10.3.113.188/30	10.3.113.189 – 10.3.113.190	10.3.113.191
113	10.3.113.192/30	10.3.113.193 – 10.3.113.194	10.3.113.195
114	10.3.113.196/30	10.3.113.197 – 10.3.113.198	10.3.113.199
115	10.3.113.200/30	10.3.113.201 – 10.3.113.202	10.3.113.203
116	10.3.113.204/30	10.3.113.205 – 10.3.113.206	10.3.113.207
117	10.3.113.208/30	10.3.113.209 – 10.3.113.210	10.3.113.211
118	10.3.113.212/30	10.3.113.213 – 10.3.113.214	10.3.113.215
119	10.3.113.216/30	10.3.113.217 – 10.3.113.218	10.3.113.219
120	10.3.113.220/30	10.3.113.221 – 10.3.113.222	10.3.113.223
121	10.3.113.224/30	10.3.113.225 – 10.3.113.226	10.3.113.227
122	10.3.113.228/30	10.3.113.229 – 10.3.113.230	10.3.113.231
123	10.3.113.232/30	10.3.113.233 – 10.3.113.234	10.3.113.235
124	10.3.113.236/30	10.3.113.237 – 10.3.113.238	10.3.113.239
125	10.3.113.240/30	10.3.113.241 – 10.3.113.242	10.3.113.243
126	10.3.113.244/30	10.3.113.245 – 10.3.113.246	10.3.113.247
127	10.3.113.248/30	10.3.113.249 – 10.3.113.250	10.3.113.251
128	10.3.113.252/30	10.3.113.253 – 10.3.113.254	10.3.113.255

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 /23
/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	1
/24	255.255.255.0	256	254	2 split →
/25	255.255.255.128	128	126	4 split →
/26	255.255.255.192	64	62	8 split →
/27	255.255.255.224	32	30	16 split →
/28	255.255.255.240	16	14	32 split →
/29	255.255.255.248	8	6	64 split →
/30	255.255.255.252	4	2	128 split →
/31	255.255.255.254	2	2	256 split →
/32	255.255.255.255	1	1	512 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 →