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)10.1.190.0/23

network10.1.190.0/23

broadcast10.1.191.255

first host10.1.190.1

last host10.1.191.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.1.190.0/23

address00001010.00000001.10111110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000001.10111110.00000000

broadcast00001010.00000001.10111111.11111111

green = network part, grey = host part

hex0x0a01be00

decimal167886336

reverse dns0.190.1.10.in-addr.arpa

ipv4-mapped::ffff:a01:be00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.1.190.0/30	10.1.190.1 – 10.1.190.2	10.1.190.3
2	10.1.190.4/30	10.1.190.5 – 10.1.190.6	10.1.190.7
3	10.1.190.8/30	10.1.190.9 – 10.1.190.10	10.1.190.11
4	10.1.190.12/30	10.1.190.13 – 10.1.190.14	10.1.190.15
5	10.1.190.16/30	10.1.190.17 – 10.1.190.18	10.1.190.19
6	10.1.190.20/30	10.1.190.21 – 10.1.190.22	10.1.190.23
7	10.1.190.24/30	10.1.190.25 – 10.1.190.26	10.1.190.27
8	10.1.190.28/30	10.1.190.29 – 10.1.190.30	10.1.190.31
9	10.1.190.32/30	10.1.190.33 – 10.1.190.34	10.1.190.35
10	10.1.190.36/30	10.1.190.37 – 10.1.190.38	10.1.190.39
11	10.1.190.40/30	10.1.190.41 – 10.1.190.42	10.1.190.43
12	10.1.190.44/30	10.1.190.45 – 10.1.190.46	10.1.190.47
13	10.1.190.48/30	10.1.190.49 – 10.1.190.50	10.1.190.51
14	10.1.190.52/30	10.1.190.53 – 10.1.190.54	10.1.190.55
15	10.1.190.56/30	10.1.190.57 – 10.1.190.58	10.1.190.59
16	10.1.190.60/30	10.1.190.61 – 10.1.190.62	10.1.190.63
17	10.1.190.64/30	10.1.190.65 – 10.1.190.66	10.1.190.67
18	10.1.190.68/30	10.1.190.69 – 10.1.190.70	10.1.190.71
19	10.1.190.72/30	10.1.190.73 – 10.1.190.74	10.1.190.75
20	10.1.190.76/30	10.1.190.77 – 10.1.190.78	10.1.190.79
21	10.1.190.80/30	10.1.190.81 – 10.1.190.82	10.1.190.83
22	10.1.190.84/30	10.1.190.85 – 10.1.190.86	10.1.190.87
23	10.1.190.88/30	10.1.190.89 – 10.1.190.90	10.1.190.91
24	10.1.190.92/30	10.1.190.93 – 10.1.190.94	10.1.190.95
25	10.1.190.96/30	10.1.190.97 – 10.1.190.98	10.1.190.99
26	10.1.190.100/30	10.1.190.101 – 10.1.190.102	10.1.190.103
27	10.1.190.104/30	10.1.190.105 – 10.1.190.106	10.1.190.107
28	10.1.190.108/30	10.1.190.109 – 10.1.190.110	10.1.190.111
29	10.1.190.112/30	10.1.190.113 – 10.1.190.114	10.1.190.115
30	10.1.190.116/30	10.1.190.117 – 10.1.190.118	10.1.190.119
31	10.1.190.120/30	10.1.190.121 – 10.1.190.122	10.1.190.123
32	10.1.190.124/30	10.1.190.125 – 10.1.190.126	10.1.190.127
33	10.1.190.128/30	10.1.190.129 – 10.1.190.130	10.1.190.131
34	10.1.190.132/30	10.1.190.133 – 10.1.190.134	10.1.190.135
35	10.1.190.136/30	10.1.190.137 – 10.1.190.138	10.1.190.139
36	10.1.190.140/30	10.1.190.141 – 10.1.190.142	10.1.190.143
37	10.1.190.144/30	10.1.190.145 – 10.1.190.146	10.1.190.147
38	10.1.190.148/30	10.1.190.149 – 10.1.190.150	10.1.190.151
39	10.1.190.152/30	10.1.190.153 – 10.1.190.154	10.1.190.155
40	10.1.190.156/30	10.1.190.157 – 10.1.190.158	10.1.190.159
41	10.1.190.160/30	10.1.190.161 – 10.1.190.162	10.1.190.163
42	10.1.190.164/30	10.1.190.165 – 10.1.190.166	10.1.190.167
43	10.1.190.168/30	10.1.190.169 – 10.1.190.170	10.1.190.171
44	10.1.190.172/30	10.1.190.173 – 10.1.190.174	10.1.190.175
45	10.1.190.176/30	10.1.190.177 – 10.1.190.178	10.1.190.179
46	10.1.190.180/30	10.1.190.181 – 10.1.190.182	10.1.190.183
47	10.1.190.184/30	10.1.190.185 – 10.1.190.186	10.1.190.187
48	10.1.190.188/30	10.1.190.189 – 10.1.190.190	10.1.190.191
49	10.1.190.192/30	10.1.190.193 – 10.1.190.194	10.1.190.195
50	10.1.190.196/30	10.1.190.197 – 10.1.190.198	10.1.190.199
51	10.1.190.200/30	10.1.190.201 – 10.1.190.202	10.1.190.203
52	10.1.190.204/30	10.1.190.205 – 10.1.190.206	10.1.190.207
53	10.1.190.208/30	10.1.190.209 – 10.1.190.210	10.1.190.211
54	10.1.190.212/30	10.1.190.213 – 10.1.190.214	10.1.190.215
55	10.1.190.216/30	10.1.190.217 – 10.1.190.218	10.1.190.219
56	10.1.190.220/30	10.1.190.221 – 10.1.190.222	10.1.190.223
57	10.1.190.224/30	10.1.190.225 – 10.1.190.226	10.1.190.227
58	10.1.190.228/30	10.1.190.229 – 10.1.190.230	10.1.190.231
59	10.1.190.232/30	10.1.190.233 – 10.1.190.234	10.1.190.235
60	10.1.190.236/30	10.1.190.237 – 10.1.190.238	10.1.190.239
61	10.1.190.240/30	10.1.190.241 – 10.1.190.242	10.1.190.243
62	10.1.190.244/30	10.1.190.245 – 10.1.190.246	10.1.190.247
63	10.1.190.248/30	10.1.190.249 – 10.1.190.250	10.1.190.251
64	10.1.190.252/30	10.1.190.253 – 10.1.190.254	10.1.190.255
65	10.1.191.0/30	10.1.191.1 – 10.1.191.2	10.1.191.3
66	10.1.191.4/30	10.1.191.5 – 10.1.191.6	10.1.191.7
67	10.1.191.8/30	10.1.191.9 – 10.1.191.10	10.1.191.11
68	10.1.191.12/30	10.1.191.13 – 10.1.191.14	10.1.191.15
69	10.1.191.16/30	10.1.191.17 – 10.1.191.18	10.1.191.19
70	10.1.191.20/30	10.1.191.21 – 10.1.191.22	10.1.191.23
71	10.1.191.24/30	10.1.191.25 – 10.1.191.26	10.1.191.27
72	10.1.191.28/30	10.1.191.29 – 10.1.191.30	10.1.191.31
73	10.1.191.32/30	10.1.191.33 – 10.1.191.34	10.1.191.35
74	10.1.191.36/30	10.1.191.37 – 10.1.191.38	10.1.191.39
75	10.1.191.40/30	10.1.191.41 – 10.1.191.42	10.1.191.43
76	10.1.191.44/30	10.1.191.45 – 10.1.191.46	10.1.191.47
77	10.1.191.48/30	10.1.191.49 – 10.1.191.50	10.1.191.51
78	10.1.191.52/30	10.1.191.53 – 10.1.191.54	10.1.191.55
79	10.1.191.56/30	10.1.191.57 – 10.1.191.58	10.1.191.59
80	10.1.191.60/30	10.1.191.61 – 10.1.191.62	10.1.191.63
81	10.1.191.64/30	10.1.191.65 – 10.1.191.66	10.1.191.67
82	10.1.191.68/30	10.1.191.69 – 10.1.191.70	10.1.191.71
83	10.1.191.72/30	10.1.191.73 – 10.1.191.74	10.1.191.75
84	10.1.191.76/30	10.1.191.77 – 10.1.191.78	10.1.191.79
85	10.1.191.80/30	10.1.191.81 – 10.1.191.82	10.1.191.83
86	10.1.191.84/30	10.1.191.85 – 10.1.191.86	10.1.191.87
87	10.1.191.88/30	10.1.191.89 – 10.1.191.90	10.1.191.91
88	10.1.191.92/30	10.1.191.93 – 10.1.191.94	10.1.191.95
89	10.1.191.96/30	10.1.191.97 – 10.1.191.98	10.1.191.99
90	10.1.191.100/30	10.1.191.101 – 10.1.191.102	10.1.191.103
91	10.1.191.104/30	10.1.191.105 – 10.1.191.106	10.1.191.107
92	10.1.191.108/30	10.1.191.109 – 10.1.191.110	10.1.191.111
93	10.1.191.112/30	10.1.191.113 – 10.1.191.114	10.1.191.115
94	10.1.191.116/30	10.1.191.117 – 10.1.191.118	10.1.191.119
95	10.1.191.120/30	10.1.191.121 – 10.1.191.122	10.1.191.123
96	10.1.191.124/30	10.1.191.125 – 10.1.191.126	10.1.191.127
97	10.1.191.128/30	10.1.191.129 – 10.1.191.130	10.1.191.131
98	10.1.191.132/30	10.1.191.133 – 10.1.191.134	10.1.191.135
99	10.1.191.136/30	10.1.191.137 – 10.1.191.138	10.1.191.139
100	10.1.191.140/30	10.1.191.141 – 10.1.191.142	10.1.191.143
101	10.1.191.144/30	10.1.191.145 – 10.1.191.146	10.1.191.147
102	10.1.191.148/30	10.1.191.149 – 10.1.191.150	10.1.191.151
103	10.1.191.152/30	10.1.191.153 – 10.1.191.154	10.1.191.155
104	10.1.191.156/30	10.1.191.157 – 10.1.191.158	10.1.191.159
105	10.1.191.160/30	10.1.191.161 – 10.1.191.162	10.1.191.163
106	10.1.191.164/30	10.1.191.165 – 10.1.191.166	10.1.191.167
107	10.1.191.168/30	10.1.191.169 – 10.1.191.170	10.1.191.171
108	10.1.191.172/30	10.1.191.173 – 10.1.191.174	10.1.191.175
109	10.1.191.176/30	10.1.191.177 – 10.1.191.178	10.1.191.179
110	10.1.191.180/30	10.1.191.181 – 10.1.191.182	10.1.191.183
111	10.1.191.184/30	10.1.191.185 – 10.1.191.186	10.1.191.187
112	10.1.191.188/30	10.1.191.189 – 10.1.191.190	10.1.191.191
113	10.1.191.192/30	10.1.191.193 – 10.1.191.194	10.1.191.195
114	10.1.191.196/30	10.1.191.197 – 10.1.191.198	10.1.191.199
115	10.1.191.200/30	10.1.191.201 – 10.1.191.202	10.1.191.203
116	10.1.191.204/30	10.1.191.205 – 10.1.191.206	10.1.191.207
117	10.1.191.208/30	10.1.191.209 – 10.1.191.210	10.1.191.211
118	10.1.191.212/30	10.1.191.213 – 10.1.191.214	10.1.191.215
119	10.1.191.216/30	10.1.191.217 – 10.1.191.218	10.1.191.219
120	10.1.191.220/30	10.1.191.221 – 10.1.191.222	10.1.191.223
121	10.1.191.224/30	10.1.191.225 – 10.1.191.226	10.1.191.227
122	10.1.191.228/30	10.1.191.229 – 10.1.191.230	10.1.191.231
123	10.1.191.232/30	10.1.191.233 – 10.1.191.234	10.1.191.235
124	10.1.191.236/30	10.1.191.237 – 10.1.191.238	10.1.191.239
125	10.1.191.240/30	10.1.191.241 – 10.1.191.242	10.1.191.243
126	10.1.191.244/30	10.1.191.245 – 10.1.191.246	10.1.191.247
127	10.1.191.248/30	10.1.191.249 – 10.1.191.250	10.1.191.251
128	10.1.191.252/30	10.1.191.253 – 10.1.191.254	10.1.191.255

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 →