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)10.158.188.0/23

network10.158.188.0/23

broadcast10.158.189.255

first host10.158.188.1

last host10.158.189.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.158.188.0/23

address00001010.10011110.10111100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10011110.10111100.00000000

broadcast00001010.10011110.10111101.11111111

green = network part, grey = host part

hex0x0a9ebc00

decimal178174976

reverse dns0.188.158.10.in-addr.arpa

ipv4-mapped::ffff:a9e:bc00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.158.188.0/30	10.158.188.1 – 10.158.188.2	10.158.188.3
2	10.158.188.4/30	10.158.188.5 – 10.158.188.6	10.158.188.7
3	10.158.188.8/30	10.158.188.9 – 10.158.188.10	10.158.188.11
4	10.158.188.12/30	10.158.188.13 – 10.158.188.14	10.158.188.15
5	10.158.188.16/30	10.158.188.17 – 10.158.188.18	10.158.188.19
6	10.158.188.20/30	10.158.188.21 – 10.158.188.22	10.158.188.23
7	10.158.188.24/30	10.158.188.25 – 10.158.188.26	10.158.188.27
8	10.158.188.28/30	10.158.188.29 – 10.158.188.30	10.158.188.31
9	10.158.188.32/30	10.158.188.33 – 10.158.188.34	10.158.188.35
10	10.158.188.36/30	10.158.188.37 – 10.158.188.38	10.158.188.39
11	10.158.188.40/30	10.158.188.41 – 10.158.188.42	10.158.188.43
12	10.158.188.44/30	10.158.188.45 – 10.158.188.46	10.158.188.47
13	10.158.188.48/30	10.158.188.49 – 10.158.188.50	10.158.188.51
14	10.158.188.52/30	10.158.188.53 – 10.158.188.54	10.158.188.55
15	10.158.188.56/30	10.158.188.57 – 10.158.188.58	10.158.188.59
16	10.158.188.60/30	10.158.188.61 – 10.158.188.62	10.158.188.63
17	10.158.188.64/30	10.158.188.65 – 10.158.188.66	10.158.188.67
18	10.158.188.68/30	10.158.188.69 – 10.158.188.70	10.158.188.71
19	10.158.188.72/30	10.158.188.73 – 10.158.188.74	10.158.188.75
20	10.158.188.76/30	10.158.188.77 – 10.158.188.78	10.158.188.79
21	10.158.188.80/30	10.158.188.81 – 10.158.188.82	10.158.188.83
22	10.158.188.84/30	10.158.188.85 – 10.158.188.86	10.158.188.87
23	10.158.188.88/30	10.158.188.89 – 10.158.188.90	10.158.188.91
24	10.158.188.92/30	10.158.188.93 – 10.158.188.94	10.158.188.95
25	10.158.188.96/30	10.158.188.97 – 10.158.188.98	10.158.188.99
26	10.158.188.100/30	10.158.188.101 – 10.158.188.102	10.158.188.103
27	10.158.188.104/30	10.158.188.105 – 10.158.188.106	10.158.188.107
28	10.158.188.108/30	10.158.188.109 – 10.158.188.110	10.158.188.111
29	10.158.188.112/30	10.158.188.113 – 10.158.188.114	10.158.188.115
30	10.158.188.116/30	10.158.188.117 – 10.158.188.118	10.158.188.119
31	10.158.188.120/30	10.158.188.121 – 10.158.188.122	10.158.188.123
32	10.158.188.124/30	10.158.188.125 – 10.158.188.126	10.158.188.127
33	10.158.188.128/30	10.158.188.129 – 10.158.188.130	10.158.188.131
34	10.158.188.132/30	10.158.188.133 – 10.158.188.134	10.158.188.135
35	10.158.188.136/30	10.158.188.137 – 10.158.188.138	10.158.188.139
36	10.158.188.140/30	10.158.188.141 – 10.158.188.142	10.158.188.143
37	10.158.188.144/30	10.158.188.145 – 10.158.188.146	10.158.188.147
38	10.158.188.148/30	10.158.188.149 – 10.158.188.150	10.158.188.151
39	10.158.188.152/30	10.158.188.153 – 10.158.188.154	10.158.188.155
40	10.158.188.156/30	10.158.188.157 – 10.158.188.158	10.158.188.159
41	10.158.188.160/30	10.158.188.161 – 10.158.188.162	10.158.188.163
42	10.158.188.164/30	10.158.188.165 – 10.158.188.166	10.158.188.167
43	10.158.188.168/30	10.158.188.169 – 10.158.188.170	10.158.188.171
44	10.158.188.172/30	10.158.188.173 – 10.158.188.174	10.158.188.175
45	10.158.188.176/30	10.158.188.177 – 10.158.188.178	10.158.188.179
46	10.158.188.180/30	10.158.188.181 – 10.158.188.182	10.158.188.183
47	10.158.188.184/30	10.158.188.185 – 10.158.188.186	10.158.188.187
48	10.158.188.188/30	10.158.188.189 – 10.158.188.190	10.158.188.191
49	10.158.188.192/30	10.158.188.193 – 10.158.188.194	10.158.188.195
50	10.158.188.196/30	10.158.188.197 – 10.158.188.198	10.158.188.199
51	10.158.188.200/30	10.158.188.201 – 10.158.188.202	10.158.188.203
52	10.158.188.204/30	10.158.188.205 – 10.158.188.206	10.158.188.207
53	10.158.188.208/30	10.158.188.209 – 10.158.188.210	10.158.188.211
54	10.158.188.212/30	10.158.188.213 – 10.158.188.214	10.158.188.215
55	10.158.188.216/30	10.158.188.217 – 10.158.188.218	10.158.188.219
56	10.158.188.220/30	10.158.188.221 – 10.158.188.222	10.158.188.223
57	10.158.188.224/30	10.158.188.225 – 10.158.188.226	10.158.188.227
58	10.158.188.228/30	10.158.188.229 – 10.158.188.230	10.158.188.231
59	10.158.188.232/30	10.158.188.233 – 10.158.188.234	10.158.188.235
60	10.158.188.236/30	10.158.188.237 – 10.158.188.238	10.158.188.239
61	10.158.188.240/30	10.158.188.241 – 10.158.188.242	10.158.188.243
62	10.158.188.244/30	10.158.188.245 – 10.158.188.246	10.158.188.247
63	10.158.188.248/30	10.158.188.249 – 10.158.188.250	10.158.188.251
64	10.158.188.252/30	10.158.188.253 – 10.158.188.254	10.158.188.255
65	10.158.189.0/30	10.158.189.1 – 10.158.189.2	10.158.189.3
66	10.158.189.4/30	10.158.189.5 – 10.158.189.6	10.158.189.7
67	10.158.189.8/30	10.158.189.9 – 10.158.189.10	10.158.189.11
68	10.158.189.12/30	10.158.189.13 – 10.158.189.14	10.158.189.15
69	10.158.189.16/30	10.158.189.17 – 10.158.189.18	10.158.189.19
70	10.158.189.20/30	10.158.189.21 – 10.158.189.22	10.158.189.23
71	10.158.189.24/30	10.158.189.25 – 10.158.189.26	10.158.189.27
72	10.158.189.28/30	10.158.189.29 – 10.158.189.30	10.158.189.31
73	10.158.189.32/30	10.158.189.33 – 10.158.189.34	10.158.189.35
74	10.158.189.36/30	10.158.189.37 – 10.158.189.38	10.158.189.39
75	10.158.189.40/30	10.158.189.41 – 10.158.189.42	10.158.189.43
76	10.158.189.44/30	10.158.189.45 – 10.158.189.46	10.158.189.47
77	10.158.189.48/30	10.158.189.49 – 10.158.189.50	10.158.189.51
78	10.158.189.52/30	10.158.189.53 – 10.158.189.54	10.158.189.55
79	10.158.189.56/30	10.158.189.57 – 10.158.189.58	10.158.189.59
80	10.158.189.60/30	10.158.189.61 – 10.158.189.62	10.158.189.63
81	10.158.189.64/30	10.158.189.65 – 10.158.189.66	10.158.189.67
82	10.158.189.68/30	10.158.189.69 – 10.158.189.70	10.158.189.71
83	10.158.189.72/30	10.158.189.73 – 10.158.189.74	10.158.189.75
84	10.158.189.76/30	10.158.189.77 – 10.158.189.78	10.158.189.79
85	10.158.189.80/30	10.158.189.81 – 10.158.189.82	10.158.189.83
86	10.158.189.84/30	10.158.189.85 – 10.158.189.86	10.158.189.87
87	10.158.189.88/30	10.158.189.89 – 10.158.189.90	10.158.189.91
88	10.158.189.92/30	10.158.189.93 – 10.158.189.94	10.158.189.95
89	10.158.189.96/30	10.158.189.97 – 10.158.189.98	10.158.189.99
90	10.158.189.100/30	10.158.189.101 – 10.158.189.102	10.158.189.103
91	10.158.189.104/30	10.158.189.105 – 10.158.189.106	10.158.189.107
92	10.158.189.108/30	10.158.189.109 – 10.158.189.110	10.158.189.111
93	10.158.189.112/30	10.158.189.113 – 10.158.189.114	10.158.189.115
94	10.158.189.116/30	10.158.189.117 – 10.158.189.118	10.158.189.119
95	10.158.189.120/30	10.158.189.121 – 10.158.189.122	10.158.189.123
96	10.158.189.124/30	10.158.189.125 – 10.158.189.126	10.158.189.127
97	10.158.189.128/30	10.158.189.129 – 10.158.189.130	10.158.189.131
98	10.158.189.132/30	10.158.189.133 – 10.158.189.134	10.158.189.135
99	10.158.189.136/30	10.158.189.137 – 10.158.189.138	10.158.189.139
100	10.158.189.140/30	10.158.189.141 – 10.158.189.142	10.158.189.143
101	10.158.189.144/30	10.158.189.145 – 10.158.189.146	10.158.189.147
102	10.158.189.148/30	10.158.189.149 – 10.158.189.150	10.158.189.151
103	10.158.189.152/30	10.158.189.153 – 10.158.189.154	10.158.189.155
104	10.158.189.156/30	10.158.189.157 – 10.158.189.158	10.158.189.159
105	10.158.189.160/30	10.158.189.161 – 10.158.189.162	10.158.189.163
106	10.158.189.164/30	10.158.189.165 – 10.158.189.166	10.158.189.167
107	10.158.189.168/30	10.158.189.169 – 10.158.189.170	10.158.189.171
108	10.158.189.172/30	10.158.189.173 – 10.158.189.174	10.158.189.175
109	10.158.189.176/30	10.158.189.177 – 10.158.189.178	10.158.189.179
110	10.158.189.180/30	10.158.189.181 – 10.158.189.182	10.158.189.183
111	10.158.189.184/30	10.158.189.185 – 10.158.189.186	10.158.189.187
112	10.158.189.188/30	10.158.189.189 – 10.158.189.190	10.158.189.191
113	10.158.189.192/30	10.158.189.193 – 10.158.189.194	10.158.189.195
114	10.158.189.196/30	10.158.189.197 – 10.158.189.198	10.158.189.199
115	10.158.189.200/30	10.158.189.201 – 10.158.189.202	10.158.189.203
116	10.158.189.204/30	10.158.189.205 – 10.158.189.206	10.158.189.207
117	10.158.189.208/30	10.158.189.209 – 10.158.189.210	10.158.189.211
118	10.158.189.212/30	10.158.189.213 – 10.158.189.214	10.158.189.215
119	10.158.189.216/30	10.158.189.217 – 10.158.189.218	10.158.189.219
120	10.158.189.220/30	10.158.189.221 – 10.158.189.222	10.158.189.223
121	10.158.189.224/30	10.158.189.225 – 10.158.189.226	10.158.189.227
122	10.158.189.228/30	10.158.189.229 – 10.158.189.230	10.158.189.231
123	10.158.189.232/30	10.158.189.233 – 10.158.189.234	10.158.189.235
124	10.158.189.236/30	10.158.189.237 – 10.158.189.238	10.158.189.239
125	10.158.189.240/30	10.158.189.241 – 10.158.189.242	10.158.189.243
126	10.158.189.244/30	10.158.189.245 – 10.158.189.246	10.158.189.247
127	10.158.189.248/30	10.158.189.249 – 10.158.189.250	10.158.189.251
128	10.158.189.252/30	10.158.189.253 – 10.158.189.254	10.158.189.255

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 →