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)10.131.182.0/23

network10.131.182.0/23

broadcast10.131.183.255

first host10.131.182.1

last host10.131.183.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.131.182.0/23

address00001010.10000011.10110110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10000011.10110110.00000000

broadcast00001010.10000011.10110111.11111111

green = network part, grey = host part

hex0x0a83b600

decimal176403968

reverse dns0.182.131.10.in-addr.arpa

ipv4-mapped::ffff:a83:b600

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.131.182.0/30	10.131.182.1 – 10.131.182.2	10.131.182.3
2	10.131.182.4/30	10.131.182.5 – 10.131.182.6	10.131.182.7
3	10.131.182.8/30	10.131.182.9 – 10.131.182.10	10.131.182.11
4	10.131.182.12/30	10.131.182.13 – 10.131.182.14	10.131.182.15
5	10.131.182.16/30	10.131.182.17 – 10.131.182.18	10.131.182.19
6	10.131.182.20/30	10.131.182.21 – 10.131.182.22	10.131.182.23
7	10.131.182.24/30	10.131.182.25 – 10.131.182.26	10.131.182.27
8	10.131.182.28/30	10.131.182.29 – 10.131.182.30	10.131.182.31
9	10.131.182.32/30	10.131.182.33 – 10.131.182.34	10.131.182.35
10	10.131.182.36/30	10.131.182.37 – 10.131.182.38	10.131.182.39
11	10.131.182.40/30	10.131.182.41 – 10.131.182.42	10.131.182.43
12	10.131.182.44/30	10.131.182.45 – 10.131.182.46	10.131.182.47
13	10.131.182.48/30	10.131.182.49 – 10.131.182.50	10.131.182.51
14	10.131.182.52/30	10.131.182.53 – 10.131.182.54	10.131.182.55
15	10.131.182.56/30	10.131.182.57 – 10.131.182.58	10.131.182.59
16	10.131.182.60/30	10.131.182.61 – 10.131.182.62	10.131.182.63
17	10.131.182.64/30	10.131.182.65 – 10.131.182.66	10.131.182.67
18	10.131.182.68/30	10.131.182.69 – 10.131.182.70	10.131.182.71
19	10.131.182.72/30	10.131.182.73 – 10.131.182.74	10.131.182.75
20	10.131.182.76/30	10.131.182.77 – 10.131.182.78	10.131.182.79
21	10.131.182.80/30	10.131.182.81 – 10.131.182.82	10.131.182.83
22	10.131.182.84/30	10.131.182.85 – 10.131.182.86	10.131.182.87
23	10.131.182.88/30	10.131.182.89 – 10.131.182.90	10.131.182.91
24	10.131.182.92/30	10.131.182.93 – 10.131.182.94	10.131.182.95
25	10.131.182.96/30	10.131.182.97 – 10.131.182.98	10.131.182.99
26	10.131.182.100/30	10.131.182.101 – 10.131.182.102	10.131.182.103
27	10.131.182.104/30	10.131.182.105 – 10.131.182.106	10.131.182.107
28	10.131.182.108/30	10.131.182.109 – 10.131.182.110	10.131.182.111
29	10.131.182.112/30	10.131.182.113 – 10.131.182.114	10.131.182.115
30	10.131.182.116/30	10.131.182.117 – 10.131.182.118	10.131.182.119
31	10.131.182.120/30	10.131.182.121 – 10.131.182.122	10.131.182.123
32	10.131.182.124/30	10.131.182.125 – 10.131.182.126	10.131.182.127
33	10.131.182.128/30	10.131.182.129 – 10.131.182.130	10.131.182.131
34	10.131.182.132/30	10.131.182.133 – 10.131.182.134	10.131.182.135
35	10.131.182.136/30	10.131.182.137 – 10.131.182.138	10.131.182.139
36	10.131.182.140/30	10.131.182.141 – 10.131.182.142	10.131.182.143
37	10.131.182.144/30	10.131.182.145 – 10.131.182.146	10.131.182.147
38	10.131.182.148/30	10.131.182.149 – 10.131.182.150	10.131.182.151
39	10.131.182.152/30	10.131.182.153 – 10.131.182.154	10.131.182.155
40	10.131.182.156/30	10.131.182.157 – 10.131.182.158	10.131.182.159
41	10.131.182.160/30	10.131.182.161 – 10.131.182.162	10.131.182.163
42	10.131.182.164/30	10.131.182.165 – 10.131.182.166	10.131.182.167
43	10.131.182.168/30	10.131.182.169 – 10.131.182.170	10.131.182.171
44	10.131.182.172/30	10.131.182.173 – 10.131.182.174	10.131.182.175
45	10.131.182.176/30	10.131.182.177 – 10.131.182.178	10.131.182.179
46	10.131.182.180/30	10.131.182.181 – 10.131.182.182	10.131.182.183
47	10.131.182.184/30	10.131.182.185 – 10.131.182.186	10.131.182.187
48	10.131.182.188/30	10.131.182.189 – 10.131.182.190	10.131.182.191
49	10.131.182.192/30	10.131.182.193 – 10.131.182.194	10.131.182.195
50	10.131.182.196/30	10.131.182.197 – 10.131.182.198	10.131.182.199
51	10.131.182.200/30	10.131.182.201 – 10.131.182.202	10.131.182.203
52	10.131.182.204/30	10.131.182.205 – 10.131.182.206	10.131.182.207
53	10.131.182.208/30	10.131.182.209 – 10.131.182.210	10.131.182.211
54	10.131.182.212/30	10.131.182.213 – 10.131.182.214	10.131.182.215
55	10.131.182.216/30	10.131.182.217 – 10.131.182.218	10.131.182.219
56	10.131.182.220/30	10.131.182.221 – 10.131.182.222	10.131.182.223
57	10.131.182.224/30	10.131.182.225 – 10.131.182.226	10.131.182.227
58	10.131.182.228/30	10.131.182.229 – 10.131.182.230	10.131.182.231
59	10.131.182.232/30	10.131.182.233 – 10.131.182.234	10.131.182.235
60	10.131.182.236/30	10.131.182.237 – 10.131.182.238	10.131.182.239
61	10.131.182.240/30	10.131.182.241 – 10.131.182.242	10.131.182.243
62	10.131.182.244/30	10.131.182.245 – 10.131.182.246	10.131.182.247
63	10.131.182.248/30	10.131.182.249 – 10.131.182.250	10.131.182.251
64	10.131.182.252/30	10.131.182.253 – 10.131.182.254	10.131.182.255
65	10.131.183.0/30	10.131.183.1 – 10.131.183.2	10.131.183.3
66	10.131.183.4/30	10.131.183.5 – 10.131.183.6	10.131.183.7
67	10.131.183.8/30	10.131.183.9 – 10.131.183.10	10.131.183.11
68	10.131.183.12/30	10.131.183.13 – 10.131.183.14	10.131.183.15
69	10.131.183.16/30	10.131.183.17 – 10.131.183.18	10.131.183.19
70	10.131.183.20/30	10.131.183.21 – 10.131.183.22	10.131.183.23
71	10.131.183.24/30	10.131.183.25 – 10.131.183.26	10.131.183.27
72	10.131.183.28/30	10.131.183.29 – 10.131.183.30	10.131.183.31
73	10.131.183.32/30	10.131.183.33 – 10.131.183.34	10.131.183.35
74	10.131.183.36/30	10.131.183.37 – 10.131.183.38	10.131.183.39
75	10.131.183.40/30	10.131.183.41 – 10.131.183.42	10.131.183.43
76	10.131.183.44/30	10.131.183.45 – 10.131.183.46	10.131.183.47
77	10.131.183.48/30	10.131.183.49 – 10.131.183.50	10.131.183.51
78	10.131.183.52/30	10.131.183.53 – 10.131.183.54	10.131.183.55
79	10.131.183.56/30	10.131.183.57 – 10.131.183.58	10.131.183.59
80	10.131.183.60/30	10.131.183.61 – 10.131.183.62	10.131.183.63
81	10.131.183.64/30	10.131.183.65 – 10.131.183.66	10.131.183.67
82	10.131.183.68/30	10.131.183.69 – 10.131.183.70	10.131.183.71
83	10.131.183.72/30	10.131.183.73 – 10.131.183.74	10.131.183.75
84	10.131.183.76/30	10.131.183.77 – 10.131.183.78	10.131.183.79
85	10.131.183.80/30	10.131.183.81 – 10.131.183.82	10.131.183.83
86	10.131.183.84/30	10.131.183.85 – 10.131.183.86	10.131.183.87
87	10.131.183.88/30	10.131.183.89 – 10.131.183.90	10.131.183.91
88	10.131.183.92/30	10.131.183.93 – 10.131.183.94	10.131.183.95
89	10.131.183.96/30	10.131.183.97 – 10.131.183.98	10.131.183.99
90	10.131.183.100/30	10.131.183.101 – 10.131.183.102	10.131.183.103
91	10.131.183.104/30	10.131.183.105 – 10.131.183.106	10.131.183.107
92	10.131.183.108/30	10.131.183.109 – 10.131.183.110	10.131.183.111
93	10.131.183.112/30	10.131.183.113 – 10.131.183.114	10.131.183.115
94	10.131.183.116/30	10.131.183.117 – 10.131.183.118	10.131.183.119
95	10.131.183.120/30	10.131.183.121 – 10.131.183.122	10.131.183.123
96	10.131.183.124/30	10.131.183.125 – 10.131.183.126	10.131.183.127
97	10.131.183.128/30	10.131.183.129 – 10.131.183.130	10.131.183.131
98	10.131.183.132/30	10.131.183.133 – 10.131.183.134	10.131.183.135
99	10.131.183.136/30	10.131.183.137 – 10.131.183.138	10.131.183.139
100	10.131.183.140/30	10.131.183.141 – 10.131.183.142	10.131.183.143
101	10.131.183.144/30	10.131.183.145 – 10.131.183.146	10.131.183.147
102	10.131.183.148/30	10.131.183.149 – 10.131.183.150	10.131.183.151
103	10.131.183.152/30	10.131.183.153 – 10.131.183.154	10.131.183.155
104	10.131.183.156/30	10.131.183.157 – 10.131.183.158	10.131.183.159
105	10.131.183.160/30	10.131.183.161 – 10.131.183.162	10.131.183.163
106	10.131.183.164/30	10.131.183.165 – 10.131.183.166	10.131.183.167
107	10.131.183.168/30	10.131.183.169 – 10.131.183.170	10.131.183.171
108	10.131.183.172/30	10.131.183.173 – 10.131.183.174	10.131.183.175
109	10.131.183.176/30	10.131.183.177 – 10.131.183.178	10.131.183.179
110	10.131.183.180/30	10.131.183.181 – 10.131.183.182	10.131.183.183
111	10.131.183.184/30	10.131.183.185 – 10.131.183.186	10.131.183.187
112	10.131.183.188/30	10.131.183.189 – 10.131.183.190	10.131.183.191
113	10.131.183.192/30	10.131.183.193 – 10.131.183.194	10.131.183.195
114	10.131.183.196/30	10.131.183.197 – 10.131.183.198	10.131.183.199
115	10.131.183.200/30	10.131.183.201 – 10.131.183.202	10.131.183.203
116	10.131.183.204/30	10.131.183.205 – 10.131.183.206	10.131.183.207
117	10.131.183.208/30	10.131.183.209 – 10.131.183.210	10.131.183.211
118	10.131.183.212/30	10.131.183.213 – 10.131.183.214	10.131.183.215
119	10.131.183.216/30	10.131.183.217 – 10.131.183.218	10.131.183.219
120	10.131.183.220/30	10.131.183.221 – 10.131.183.222	10.131.183.223
121	10.131.183.224/30	10.131.183.225 – 10.131.183.226	10.131.183.227
122	10.131.183.228/30	10.131.183.229 – 10.131.183.230	10.131.183.231
123	10.131.183.232/30	10.131.183.233 – 10.131.183.234	10.131.183.235
124	10.131.183.236/30	10.131.183.237 – 10.131.183.238	10.131.183.239
125	10.131.183.240/30	10.131.183.241 – 10.131.183.242	10.131.183.243
126	10.131.183.244/30	10.131.183.245 – 10.131.183.246	10.131.183.247
127	10.131.183.248/30	10.131.183.249 – 10.131.183.250	10.131.183.251
128	10.131.183.252/30	10.131.183.253 – 10.131.183.254	10.131.183.255

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 →