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)10.166.58.0/23

network10.166.58.0/23

broadcast10.166.59.255

first host10.166.58.1

last host10.166.59.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.166.58.0/23

address00001010.10100110.00111010.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10100110.00111010.00000000

broadcast00001010.10100110.00111011.11111111

green = network part, grey = host part

hex0x0aa63a00

decimal178665984

reverse dns0.58.166.10.in-addr.arpa

ipv4-mapped::ffff:aa6:3a00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.166.58.0/30	10.166.58.1 – 10.166.58.2	10.166.58.3
2	10.166.58.4/30	10.166.58.5 – 10.166.58.6	10.166.58.7
3	10.166.58.8/30	10.166.58.9 – 10.166.58.10	10.166.58.11
4	10.166.58.12/30	10.166.58.13 – 10.166.58.14	10.166.58.15
5	10.166.58.16/30	10.166.58.17 – 10.166.58.18	10.166.58.19
6	10.166.58.20/30	10.166.58.21 – 10.166.58.22	10.166.58.23
7	10.166.58.24/30	10.166.58.25 – 10.166.58.26	10.166.58.27
8	10.166.58.28/30	10.166.58.29 – 10.166.58.30	10.166.58.31
9	10.166.58.32/30	10.166.58.33 – 10.166.58.34	10.166.58.35
10	10.166.58.36/30	10.166.58.37 – 10.166.58.38	10.166.58.39
11	10.166.58.40/30	10.166.58.41 – 10.166.58.42	10.166.58.43
12	10.166.58.44/30	10.166.58.45 – 10.166.58.46	10.166.58.47
13	10.166.58.48/30	10.166.58.49 – 10.166.58.50	10.166.58.51
14	10.166.58.52/30	10.166.58.53 – 10.166.58.54	10.166.58.55
15	10.166.58.56/30	10.166.58.57 – 10.166.58.58	10.166.58.59
16	10.166.58.60/30	10.166.58.61 – 10.166.58.62	10.166.58.63
17	10.166.58.64/30	10.166.58.65 – 10.166.58.66	10.166.58.67
18	10.166.58.68/30	10.166.58.69 – 10.166.58.70	10.166.58.71
19	10.166.58.72/30	10.166.58.73 – 10.166.58.74	10.166.58.75
20	10.166.58.76/30	10.166.58.77 – 10.166.58.78	10.166.58.79
21	10.166.58.80/30	10.166.58.81 – 10.166.58.82	10.166.58.83
22	10.166.58.84/30	10.166.58.85 – 10.166.58.86	10.166.58.87
23	10.166.58.88/30	10.166.58.89 – 10.166.58.90	10.166.58.91
24	10.166.58.92/30	10.166.58.93 – 10.166.58.94	10.166.58.95
25	10.166.58.96/30	10.166.58.97 – 10.166.58.98	10.166.58.99
26	10.166.58.100/30	10.166.58.101 – 10.166.58.102	10.166.58.103
27	10.166.58.104/30	10.166.58.105 – 10.166.58.106	10.166.58.107
28	10.166.58.108/30	10.166.58.109 – 10.166.58.110	10.166.58.111
29	10.166.58.112/30	10.166.58.113 – 10.166.58.114	10.166.58.115
30	10.166.58.116/30	10.166.58.117 – 10.166.58.118	10.166.58.119
31	10.166.58.120/30	10.166.58.121 – 10.166.58.122	10.166.58.123
32	10.166.58.124/30	10.166.58.125 – 10.166.58.126	10.166.58.127
33	10.166.58.128/30	10.166.58.129 – 10.166.58.130	10.166.58.131
34	10.166.58.132/30	10.166.58.133 – 10.166.58.134	10.166.58.135
35	10.166.58.136/30	10.166.58.137 – 10.166.58.138	10.166.58.139
36	10.166.58.140/30	10.166.58.141 – 10.166.58.142	10.166.58.143
37	10.166.58.144/30	10.166.58.145 – 10.166.58.146	10.166.58.147
38	10.166.58.148/30	10.166.58.149 – 10.166.58.150	10.166.58.151
39	10.166.58.152/30	10.166.58.153 – 10.166.58.154	10.166.58.155
40	10.166.58.156/30	10.166.58.157 – 10.166.58.158	10.166.58.159
41	10.166.58.160/30	10.166.58.161 – 10.166.58.162	10.166.58.163
42	10.166.58.164/30	10.166.58.165 – 10.166.58.166	10.166.58.167
43	10.166.58.168/30	10.166.58.169 – 10.166.58.170	10.166.58.171
44	10.166.58.172/30	10.166.58.173 – 10.166.58.174	10.166.58.175
45	10.166.58.176/30	10.166.58.177 – 10.166.58.178	10.166.58.179
46	10.166.58.180/30	10.166.58.181 – 10.166.58.182	10.166.58.183
47	10.166.58.184/30	10.166.58.185 – 10.166.58.186	10.166.58.187
48	10.166.58.188/30	10.166.58.189 – 10.166.58.190	10.166.58.191
49	10.166.58.192/30	10.166.58.193 – 10.166.58.194	10.166.58.195
50	10.166.58.196/30	10.166.58.197 – 10.166.58.198	10.166.58.199
51	10.166.58.200/30	10.166.58.201 – 10.166.58.202	10.166.58.203
52	10.166.58.204/30	10.166.58.205 – 10.166.58.206	10.166.58.207
53	10.166.58.208/30	10.166.58.209 – 10.166.58.210	10.166.58.211
54	10.166.58.212/30	10.166.58.213 – 10.166.58.214	10.166.58.215
55	10.166.58.216/30	10.166.58.217 – 10.166.58.218	10.166.58.219
56	10.166.58.220/30	10.166.58.221 – 10.166.58.222	10.166.58.223
57	10.166.58.224/30	10.166.58.225 – 10.166.58.226	10.166.58.227
58	10.166.58.228/30	10.166.58.229 – 10.166.58.230	10.166.58.231
59	10.166.58.232/30	10.166.58.233 – 10.166.58.234	10.166.58.235
60	10.166.58.236/30	10.166.58.237 – 10.166.58.238	10.166.58.239
61	10.166.58.240/30	10.166.58.241 – 10.166.58.242	10.166.58.243
62	10.166.58.244/30	10.166.58.245 – 10.166.58.246	10.166.58.247
63	10.166.58.248/30	10.166.58.249 – 10.166.58.250	10.166.58.251
64	10.166.58.252/30	10.166.58.253 – 10.166.58.254	10.166.58.255
65	10.166.59.0/30	10.166.59.1 – 10.166.59.2	10.166.59.3
66	10.166.59.4/30	10.166.59.5 – 10.166.59.6	10.166.59.7
67	10.166.59.8/30	10.166.59.9 – 10.166.59.10	10.166.59.11
68	10.166.59.12/30	10.166.59.13 – 10.166.59.14	10.166.59.15
69	10.166.59.16/30	10.166.59.17 – 10.166.59.18	10.166.59.19
70	10.166.59.20/30	10.166.59.21 – 10.166.59.22	10.166.59.23
71	10.166.59.24/30	10.166.59.25 – 10.166.59.26	10.166.59.27
72	10.166.59.28/30	10.166.59.29 – 10.166.59.30	10.166.59.31
73	10.166.59.32/30	10.166.59.33 – 10.166.59.34	10.166.59.35
74	10.166.59.36/30	10.166.59.37 – 10.166.59.38	10.166.59.39
75	10.166.59.40/30	10.166.59.41 – 10.166.59.42	10.166.59.43
76	10.166.59.44/30	10.166.59.45 – 10.166.59.46	10.166.59.47
77	10.166.59.48/30	10.166.59.49 – 10.166.59.50	10.166.59.51
78	10.166.59.52/30	10.166.59.53 – 10.166.59.54	10.166.59.55
79	10.166.59.56/30	10.166.59.57 – 10.166.59.58	10.166.59.59
80	10.166.59.60/30	10.166.59.61 – 10.166.59.62	10.166.59.63
81	10.166.59.64/30	10.166.59.65 – 10.166.59.66	10.166.59.67
82	10.166.59.68/30	10.166.59.69 – 10.166.59.70	10.166.59.71
83	10.166.59.72/30	10.166.59.73 – 10.166.59.74	10.166.59.75
84	10.166.59.76/30	10.166.59.77 – 10.166.59.78	10.166.59.79
85	10.166.59.80/30	10.166.59.81 – 10.166.59.82	10.166.59.83
86	10.166.59.84/30	10.166.59.85 – 10.166.59.86	10.166.59.87
87	10.166.59.88/30	10.166.59.89 – 10.166.59.90	10.166.59.91
88	10.166.59.92/30	10.166.59.93 – 10.166.59.94	10.166.59.95
89	10.166.59.96/30	10.166.59.97 – 10.166.59.98	10.166.59.99
90	10.166.59.100/30	10.166.59.101 – 10.166.59.102	10.166.59.103
91	10.166.59.104/30	10.166.59.105 – 10.166.59.106	10.166.59.107
92	10.166.59.108/30	10.166.59.109 – 10.166.59.110	10.166.59.111
93	10.166.59.112/30	10.166.59.113 – 10.166.59.114	10.166.59.115
94	10.166.59.116/30	10.166.59.117 – 10.166.59.118	10.166.59.119
95	10.166.59.120/30	10.166.59.121 – 10.166.59.122	10.166.59.123
96	10.166.59.124/30	10.166.59.125 – 10.166.59.126	10.166.59.127
97	10.166.59.128/30	10.166.59.129 – 10.166.59.130	10.166.59.131
98	10.166.59.132/30	10.166.59.133 – 10.166.59.134	10.166.59.135
99	10.166.59.136/30	10.166.59.137 – 10.166.59.138	10.166.59.139
100	10.166.59.140/30	10.166.59.141 – 10.166.59.142	10.166.59.143
101	10.166.59.144/30	10.166.59.145 – 10.166.59.146	10.166.59.147
102	10.166.59.148/30	10.166.59.149 – 10.166.59.150	10.166.59.151
103	10.166.59.152/30	10.166.59.153 – 10.166.59.154	10.166.59.155
104	10.166.59.156/30	10.166.59.157 – 10.166.59.158	10.166.59.159
105	10.166.59.160/30	10.166.59.161 – 10.166.59.162	10.166.59.163
106	10.166.59.164/30	10.166.59.165 – 10.166.59.166	10.166.59.167
107	10.166.59.168/30	10.166.59.169 – 10.166.59.170	10.166.59.171
108	10.166.59.172/30	10.166.59.173 – 10.166.59.174	10.166.59.175
109	10.166.59.176/30	10.166.59.177 – 10.166.59.178	10.166.59.179
110	10.166.59.180/30	10.166.59.181 – 10.166.59.182	10.166.59.183
111	10.166.59.184/30	10.166.59.185 – 10.166.59.186	10.166.59.187
112	10.166.59.188/30	10.166.59.189 – 10.166.59.190	10.166.59.191
113	10.166.59.192/30	10.166.59.193 – 10.166.59.194	10.166.59.195
114	10.166.59.196/30	10.166.59.197 – 10.166.59.198	10.166.59.199
115	10.166.59.200/30	10.166.59.201 – 10.166.59.202	10.166.59.203
116	10.166.59.204/30	10.166.59.205 – 10.166.59.206	10.166.59.207
117	10.166.59.208/30	10.166.59.209 – 10.166.59.210	10.166.59.211
118	10.166.59.212/30	10.166.59.213 – 10.166.59.214	10.166.59.215
119	10.166.59.216/30	10.166.59.217 – 10.166.59.218	10.166.59.219
120	10.166.59.220/30	10.166.59.221 – 10.166.59.222	10.166.59.223
121	10.166.59.224/30	10.166.59.225 – 10.166.59.226	10.166.59.227
122	10.166.59.228/30	10.166.59.229 – 10.166.59.230	10.166.59.231
123	10.166.59.232/30	10.166.59.233 – 10.166.59.234	10.166.59.235
124	10.166.59.236/30	10.166.59.237 – 10.166.59.238	10.166.59.239
125	10.166.59.240/30	10.166.59.241 – 10.166.59.242	10.166.59.243
126	10.166.59.244/30	10.166.59.245 – 10.166.59.246	10.166.59.247
127	10.166.59.248/30	10.166.59.249 – 10.166.59.250	10.166.59.251
128	10.166.59.252/30	10.166.59.253 – 10.166.59.254	10.166.59.255

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 →