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)10.2.158.0/23

network10.2.158.0/23

broadcast10.2.159.255

first host10.2.158.1

last host10.2.159.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.158.0/23

address00001010.00000010.10011110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.10011110.00000000

broadcast00001010.00000010.10011111.11111111

green = network part, grey = host part

hex0x0a029e00

decimal167943680

reverse dns0.158.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:9e00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.158.0/30	10.2.158.1 – 10.2.158.2	10.2.158.3
2	10.2.158.4/30	10.2.158.5 – 10.2.158.6	10.2.158.7
3	10.2.158.8/30	10.2.158.9 – 10.2.158.10	10.2.158.11
4	10.2.158.12/30	10.2.158.13 – 10.2.158.14	10.2.158.15
5	10.2.158.16/30	10.2.158.17 – 10.2.158.18	10.2.158.19
6	10.2.158.20/30	10.2.158.21 – 10.2.158.22	10.2.158.23
7	10.2.158.24/30	10.2.158.25 – 10.2.158.26	10.2.158.27
8	10.2.158.28/30	10.2.158.29 – 10.2.158.30	10.2.158.31
9	10.2.158.32/30	10.2.158.33 – 10.2.158.34	10.2.158.35
10	10.2.158.36/30	10.2.158.37 – 10.2.158.38	10.2.158.39
11	10.2.158.40/30	10.2.158.41 – 10.2.158.42	10.2.158.43
12	10.2.158.44/30	10.2.158.45 – 10.2.158.46	10.2.158.47
13	10.2.158.48/30	10.2.158.49 – 10.2.158.50	10.2.158.51
14	10.2.158.52/30	10.2.158.53 – 10.2.158.54	10.2.158.55
15	10.2.158.56/30	10.2.158.57 – 10.2.158.58	10.2.158.59
16	10.2.158.60/30	10.2.158.61 – 10.2.158.62	10.2.158.63
17	10.2.158.64/30	10.2.158.65 – 10.2.158.66	10.2.158.67
18	10.2.158.68/30	10.2.158.69 – 10.2.158.70	10.2.158.71
19	10.2.158.72/30	10.2.158.73 – 10.2.158.74	10.2.158.75
20	10.2.158.76/30	10.2.158.77 – 10.2.158.78	10.2.158.79
21	10.2.158.80/30	10.2.158.81 – 10.2.158.82	10.2.158.83
22	10.2.158.84/30	10.2.158.85 – 10.2.158.86	10.2.158.87
23	10.2.158.88/30	10.2.158.89 – 10.2.158.90	10.2.158.91
24	10.2.158.92/30	10.2.158.93 – 10.2.158.94	10.2.158.95
25	10.2.158.96/30	10.2.158.97 – 10.2.158.98	10.2.158.99
26	10.2.158.100/30	10.2.158.101 – 10.2.158.102	10.2.158.103
27	10.2.158.104/30	10.2.158.105 – 10.2.158.106	10.2.158.107
28	10.2.158.108/30	10.2.158.109 – 10.2.158.110	10.2.158.111
29	10.2.158.112/30	10.2.158.113 – 10.2.158.114	10.2.158.115
30	10.2.158.116/30	10.2.158.117 – 10.2.158.118	10.2.158.119
31	10.2.158.120/30	10.2.158.121 – 10.2.158.122	10.2.158.123
32	10.2.158.124/30	10.2.158.125 – 10.2.158.126	10.2.158.127
33	10.2.158.128/30	10.2.158.129 – 10.2.158.130	10.2.158.131
34	10.2.158.132/30	10.2.158.133 – 10.2.158.134	10.2.158.135
35	10.2.158.136/30	10.2.158.137 – 10.2.158.138	10.2.158.139
36	10.2.158.140/30	10.2.158.141 – 10.2.158.142	10.2.158.143
37	10.2.158.144/30	10.2.158.145 – 10.2.158.146	10.2.158.147
38	10.2.158.148/30	10.2.158.149 – 10.2.158.150	10.2.158.151
39	10.2.158.152/30	10.2.158.153 – 10.2.158.154	10.2.158.155
40	10.2.158.156/30	10.2.158.157 – 10.2.158.158	10.2.158.159
41	10.2.158.160/30	10.2.158.161 – 10.2.158.162	10.2.158.163
42	10.2.158.164/30	10.2.158.165 – 10.2.158.166	10.2.158.167
43	10.2.158.168/30	10.2.158.169 – 10.2.158.170	10.2.158.171
44	10.2.158.172/30	10.2.158.173 – 10.2.158.174	10.2.158.175
45	10.2.158.176/30	10.2.158.177 – 10.2.158.178	10.2.158.179
46	10.2.158.180/30	10.2.158.181 – 10.2.158.182	10.2.158.183
47	10.2.158.184/30	10.2.158.185 – 10.2.158.186	10.2.158.187
48	10.2.158.188/30	10.2.158.189 – 10.2.158.190	10.2.158.191
49	10.2.158.192/30	10.2.158.193 – 10.2.158.194	10.2.158.195
50	10.2.158.196/30	10.2.158.197 – 10.2.158.198	10.2.158.199
51	10.2.158.200/30	10.2.158.201 – 10.2.158.202	10.2.158.203
52	10.2.158.204/30	10.2.158.205 – 10.2.158.206	10.2.158.207
53	10.2.158.208/30	10.2.158.209 – 10.2.158.210	10.2.158.211
54	10.2.158.212/30	10.2.158.213 – 10.2.158.214	10.2.158.215
55	10.2.158.216/30	10.2.158.217 – 10.2.158.218	10.2.158.219
56	10.2.158.220/30	10.2.158.221 – 10.2.158.222	10.2.158.223
57	10.2.158.224/30	10.2.158.225 – 10.2.158.226	10.2.158.227
58	10.2.158.228/30	10.2.158.229 – 10.2.158.230	10.2.158.231
59	10.2.158.232/30	10.2.158.233 – 10.2.158.234	10.2.158.235
60	10.2.158.236/30	10.2.158.237 – 10.2.158.238	10.2.158.239
61	10.2.158.240/30	10.2.158.241 – 10.2.158.242	10.2.158.243
62	10.2.158.244/30	10.2.158.245 – 10.2.158.246	10.2.158.247
63	10.2.158.248/30	10.2.158.249 – 10.2.158.250	10.2.158.251
64	10.2.158.252/30	10.2.158.253 – 10.2.158.254	10.2.158.255
65	10.2.159.0/30	10.2.159.1 – 10.2.159.2	10.2.159.3
66	10.2.159.4/30	10.2.159.5 – 10.2.159.6	10.2.159.7
67	10.2.159.8/30	10.2.159.9 – 10.2.159.10	10.2.159.11
68	10.2.159.12/30	10.2.159.13 – 10.2.159.14	10.2.159.15
69	10.2.159.16/30	10.2.159.17 – 10.2.159.18	10.2.159.19
70	10.2.159.20/30	10.2.159.21 – 10.2.159.22	10.2.159.23
71	10.2.159.24/30	10.2.159.25 – 10.2.159.26	10.2.159.27
72	10.2.159.28/30	10.2.159.29 – 10.2.159.30	10.2.159.31
73	10.2.159.32/30	10.2.159.33 – 10.2.159.34	10.2.159.35
74	10.2.159.36/30	10.2.159.37 – 10.2.159.38	10.2.159.39
75	10.2.159.40/30	10.2.159.41 – 10.2.159.42	10.2.159.43
76	10.2.159.44/30	10.2.159.45 – 10.2.159.46	10.2.159.47
77	10.2.159.48/30	10.2.159.49 – 10.2.159.50	10.2.159.51
78	10.2.159.52/30	10.2.159.53 – 10.2.159.54	10.2.159.55
79	10.2.159.56/30	10.2.159.57 – 10.2.159.58	10.2.159.59
80	10.2.159.60/30	10.2.159.61 – 10.2.159.62	10.2.159.63
81	10.2.159.64/30	10.2.159.65 – 10.2.159.66	10.2.159.67
82	10.2.159.68/30	10.2.159.69 – 10.2.159.70	10.2.159.71
83	10.2.159.72/30	10.2.159.73 – 10.2.159.74	10.2.159.75
84	10.2.159.76/30	10.2.159.77 – 10.2.159.78	10.2.159.79
85	10.2.159.80/30	10.2.159.81 – 10.2.159.82	10.2.159.83
86	10.2.159.84/30	10.2.159.85 – 10.2.159.86	10.2.159.87
87	10.2.159.88/30	10.2.159.89 – 10.2.159.90	10.2.159.91
88	10.2.159.92/30	10.2.159.93 – 10.2.159.94	10.2.159.95
89	10.2.159.96/30	10.2.159.97 – 10.2.159.98	10.2.159.99
90	10.2.159.100/30	10.2.159.101 – 10.2.159.102	10.2.159.103
91	10.2.159.104/30	10.2.159.105 – 10.2.159.106	10.2.159.107
92	10.2.159.108/30	10.2.159.109 – 10.2.159.110	10.2.159.111
93	10.2.159.112/30	10.2.159.113 – 10.2.159.114	10.2.159.115
94	10.2.159.116/30	10.2.159.117 – 10.2.159.118	10.2.159.119
95	10.2.159.120/30	10.2.159.121 – 10.2.159.122	10.2.159.123
96	10.2.159.124/30	10.2.159.125 – 10.2.159.126	10.2.159.127
97	10.2.159.128/30	10.2.159.129 – 10.2.159.130	10.2.159.131
98	10.2.159.132/30	10.2.159.133 – 10.2.159.134	10.2.159.135
99	10.2.159.136/30	10.2.159.137 – 10.2.159.138	10.2.159.139
100	10.2.159.140/30	10.2.159.141 – 10.2.159.142	10.2.159.143
101	10.2.159.144/30	10.2.159.145 – 10.2.159.146	10.2.159.147
102	10.2.159.148/30	10.2.159.149 – 10.2.159.150	10.2.159.151
103	10.2.159.152/30	10.2.159.153 – 10.2.159.154	10.2.159.155
104	10.2.159.156/30	10.2.159.157 – 10.2.159.158	10.2.159.159
105	10.2.159.160/30	10.2.159.161 – 10.2.159.162	10.2.159.163
106	10.2.159.164/30	10.2.159.165 – 10.2.159.166	10.2.159.167
107	10.2.159.168/30	10.2.159.169 – 10.2.159.170	10.2.159.171
108	10.2.159.172/30	10.2.159.173 – 10.2.159.174	10.2.159.175
109	10.2.159.176/30	10.2.159.177 – 10.2.159.178	10.2.159.179
110	10.2.159.180/30	10.2.159.181 – 10.2.159.182	10.2.159.183
111	10.2.159.184/30	10.2.159.185 – 10.2.159.186	10.2.159.187
112	10.2.159.188/30	10.2.159.189 – 10.2.159.190	10.2.159.191
113	10.2.159.192/30	10.2.159.193 – 10.2.159.194	10.2.159.195
114	10.2.159.196/30	10.2.159.197 – 10.2.159.198	10.2.159.199
115	10.2.159.200/30	10.2.159.201 – 10.2.159.202	10.2.159.203
116	10.2.159.204/30	10.2.159.205 – 10.2.159.206	10.2.159.207
117	10.2.159.208/30	10.2.159.209 – 10.2.159.210	10.2.159.211
118	10.2.159.212/30	10.2.159.213 – 10.2.159.214	10.2.159.215
119	10.2.159.216/30	10.2.159.217 – 10.2.159.218	10.2.159.219
120	10.2.159.220/30	10.2.159.221 – 10.2.159.222	10.2.159.223
121	10.2.159.224/30	10.2.159.225 – 10.2.159.226	10.2.159.227
122	10.2.159.228/30	10.2.159.229 – 10.2.159.230	10.2.159.231
123	10.2.159.232/30	10.2.159.233 – 10.2.159.234	10.2.159.235
124	10.2.159.236/30	10.2.159.237 – 10.2.159.238	10.2.159.239
125	10.2.159.240/30	10.2.159.241 – 10.2.159.242	10.2.159.243
126	10.2.159.244/30	10.2.159.245 – 10.2.159.246	10.2.159.247
127	10.2.159.248/30	10.2.159.249 – 10.2.159.250	10.2.159.251
128	10.2.159.252/30	10.2.159.253 – 10.2.159.254	10.2.159.255

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 →