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)10.2.140.0/23

network10.2.140.0/23

broadcast10.2.141.255

first host10.2.140.1

last host10.2.141.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.140.0/23

address00001010.00000010.10001100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.10001100.00000000

broadcast00001010.00000010.10001101.11111111

green = network part, grey = host part

hex0x0a028c00

decimal167939072

reverse dns0.140.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:8c00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.140.0/30	10.2.140.1 – 10.2.140.2	10.2.140.3
2	10.2.140.4/30	10.2.140.5 – 10.2.140.6	10.2.140.7
3	10.2.140.8/30	10.2.140.9 – 10.2.140.10	10.2.140.11
4	10.2.140.12/30	10.2.140.13 – 10.2.140.14	10.2.140.15
5	10.2.140.16/30	10.2.140.17 – 10.2.140.18	10.2.140.19
6	10.2.140.20/30	10.2.140.21 – 10.2.140.22	10.2.140.23
7	10.2.140.24/30	10.2.140.25 – 10.2.140.26	10.2.140.27
8	10.2.140.28/30	10.2.140.29 – 10.2.140.30	10.2.140.31
9	10.2.140.32/30	10.2.140.33 – 10.2.140.34	10.2.140.35
10	10.2.140.36/30	10.2.140.37 – 10.2.140.38	10.2.140.39
11	10.2.140.40/30	10.2.140.41 – 10.2.140.42	10.2.140.43
12	10.2.140.44/30	10.2.140.45 – 10.2.140.46	10.2.140.47
13	10.2.140.48/30	10.2.140.49 – 10.2.140.50	10.2.140.51
14	10.2.140.52/30	10.2.140.53 – 10.2.140.54	10.2.140.55
15	10.2.140.56/30	10.2.140.57 – 10.2.140.58	10.2.140.59
16	10.2.140.60/30	10.2.140.61 – 10.2.140.62	10.2.140.63
17	10.2.140.64/30	10.2.140.65 – 10.2.140.66	10.2.140.67
18	10.2.140.68/30	10.2.140.69 – 10.2.140.70	10.2.140.71
19	10.2.140.72/30	10.2.140.73 – 10.2.140.74	10.2.140.75
20	10.2.140.76/30	10.2.140.77 – 10.2.140.78	10.2.140.79
21	10.2.140.80/30	10.2.140.81 – 10.2.140.82	10.2.140.83
22	10.2.140.84/30	10.2.140.85 – 10.2.140.86	10.2.140.87
23	10.2.140.88/30	10.2.140.89 – 10.2.140.90	10.2.140.91
24	10.2.140.92/30	10.2.140.93 – 10.2.140.94	10.2.140.95
25	10.2.140.96/30	10.2.140.97 – 10.2.140.98	10.2.140.99
26	10.2.140.100/30	10.2.140.101 – 10.2.140.102	10.2.140.103
27	10.2.140.104/30	10.2.140.105 – 10.2.140.106	10.2.140.107
28	10.2.140.108/30	10.2.140.109 – 10.2.140.110	10.2.140.111
29	10.2.140.112/30	10.2.140.113 – 10.2.140.114	10.2.140.115
30	10.2.140.116/30	10.2.140.117 – 10.2.140.118	10.2.140.119
31	10.2.140.120/30	10.2.140.121 – 10.2.140.122	10.2.140.123
32	10.2.140.124/30	10.2.140.125 – 10.2.140.126	10.2.140.127
33	10.2.140.128/30	10.2.140.129 – 10.2.140.130	10.2.140.131
34	10.2.140.132/30	10.2.140.133 – 10.2.140.134	10.2.140.135
35	10.2.140.136/30	10.2.140.137 – 10.2.140.138	10.2.140.139
36	10.2.140.140/30	10.2.140.141 – 10.2.140.142	10.2.140.143
37	10.2.140.144/30	10.2.140.145 – 10.2.140.146	10.2.140.147
38	10.2.140.148/30	10.2.140.149 – 10.2.140.150	10.2.140.151
39	10.2.140.152/30	10.2.140.153 – 10.2.140.154	10.2.140.155
40	10.2.140.156/30	10.2.140.157 – 10.2.140.158	10.2.140.159
41	10.2.140.160/30	10.2.140.161 – 10.2.140.162	10.2.140.163
42	10.2.140.164/30	10.2.140.165 – 10.2.140.166	10.2.140.167
43	10.2.140.168/30	10.2.140.169 – 10.2.140.170	10.2.140.171
44	10.2.140.172/30	10.2.140.173 – 10.2.140.174	10.2.140.175
45	10.2.140.176/30	10.2.140.177 – 10.2.140.178	10.2.140.179
46	10.2.140.180/30	10.2.140.181 – 10.2.140.182	10.2.140.183
47	10.2.140.184/30	10.2.140.185 – 10.2.140.186	10.2.140.187
48	10.2.140.188/30	10.2.140.189 – 10.2.140.190	10.2.140.191
49	10.2.140.192/30	10.2.140.193 – 10.2.140.194	10.2.140.195
50	10.2.140.196/30	10.2.140.197 – 10.2.140.198	10.2.140.199
51	10.2.140.200/30	10.2.140.201 – 10.2.140.202	10.2.140.203
52	10.2.140.204/30	10.2.140.205 – 10.2.140.206	10.2.140.207
53	10.2.140.208/30	10.2.140.209 – 10.2.140.210	10.2.140.211
54	10.2.140.212/30	10.2.140.213 – 10.2.140.214	10.2.140.215
55	10.2.140.216/30	10.2.140.217 – 10.2.140.218	10.2.140.219
56	10.2.140.220/30	10.2.140.221 – 10.2.140.222	10.2.140.223
57	10.2.140.224/30	10.2.140.225 – 10.2.140.226	10.2.140.227
58	10.2.140.228/30	10.2.140.229 – 10.2.140.230	10.2.140.231
59	10.2.140.232/30	10.2.140.233 – 10.2.140.234	10.2.140.235
60	10.2.140.236/30	10.2.140.237 – 10.2.140.238	10.2.140.239
61	10.2.140.240/30	10.2.140.241 – 10.2.140.242	10.2.140.243
62	10.2.140.244/30	10.2.140.245 – 10.2.140.246	10.2.140.247
63	10.2.140.248/30	10.2.140.249 – 10.2.140.250	10.2.140.251
64	10.2.140.252/30	10.2.140.253 – 10.2.140.254	10.2.140.255
65	10.2.141.0/30	10.2.141.1 – 10.2.141.2	10.2.141.3
66	10.2.141.4/30	10.2.141.5 – 10.2.141.6	10.2.141.7
67	10.2.141.8/30	10.2.141.9 – 10.2.141.10	10.2.141.11
68	10.2.141.12/30	10.2.141.13 – 10.2.141.14	10.2.141.15
69	10.2.141.16/30	10.2.141.17 – 10.2.141.18	10.2.141.19
70	10.2.141.20/30	10.2.141.21 – 10.2.141.22	10.2.141.23
71	10.2.141.24/30	10.2.141.25 – 10.2.141.26	10.2.141.27
72	10.2.141.28/30	10.2.141.29 – 10.2.141.30	10.2.141.31
73	10.2.141.32/30	10.2.141.33 – 10.2.141.34	10.2.141.35
74	10.2.141.36/30	10.2.141.37 – 10.2.141.38	10.2.141.39
75	10.2.141.40/30	10.2.141.41 – 10.2.141.42	10.2.141.43
76	10.2.141.44/30	10.2.141.45 – 10.2.141.46	10.2.141.47
77	10.2.141.48/30	10.2.141.49 – 10.2.141.50	10.2.141.51
78	10.2.141.52/30	10.2.141.53 – 10.2.141.54	10.2.141.55
79	10.2.141.56/30	10.2.141.57 – 10.2.141.58	10.2.141.59
80	10.2.141.60/30	10.2.141.61 – 10.2.141.62	10.2.141.63
81	10.2.141.64/30	10.2.141.65 – 10.2.141.66	10.2.141.67
82	10.2.141.68/30	10.2.141.69 – 10.2.141.70	10.2.141.71
83	10.2.141.72/30	10.2.141.73 – 10.2.141.74	10.2.141.75
84	10.2.141.76/30	10.2.141.77 – 10.2.141.78	10.2.141.79
85	10.2.141.80/30	10.2.141.81 – 10.2.141.82	10.2.141.83
86	10.2.141.84/30	10.2.141.85 – 10.2.141.86	10.2.141.87
87	10.2.141.88/30	10.2.141.89 – 10.2.141.90	10.2.141.91
88	10.2.141.92/30	10.2.141.93 – 10.2.141.94	10.2.141.95
89	10.2.141.96/30	10.2.141.97 – 10.2.141.98	10.2.141.99
90	10.2.141.100/30	10.2.141.101 – 10.2.141.102	10.2.141.103
91	10.2.141.104/30	10.2.141.105 – 10.2.141.106	10.2.141.107
92	10.2.141.108/30	10.2.141.109 – 10.2.141.110	10.2.141.111
93	10.2.141.112/30	10.2.141.113 – 10.2.141.114	10.2.141.115
94	10.2.141.116/30	10.2.141.117 – 10.2.141.118	10.2.141.119
95	10.2.141.120/30	10.2.141.121 – 10.2.141.122	10.2.141.123
96	10.2.141.124/30	10.2.141.125 – 10.2.141.126	10.2.141.127
97	10.2.141.128/30	10.2.141.129 – 10.2.141.130	10.2.141.131
98	10.2.141.132/30	10.2.141.133 – 10.2.141.134	10.2.141.135
99	10.2.141.136/30	10.2.141.137 – 10.2.141.138	10.2.141.139
100	10.2.141.140/30	10.2.141.141 – 10.2.141.142	10.2.141.143
101	10.2.141.144/30	10.2.141.145 – 10.2.141.146	10.2.141.147
102	10.2.141.148/30	10.2.141.149 – 10.2.141.150	10.2.141.151
103	10.2.141.152/30	10.2.141.153 – 10.2.141.154	10.2.141.155
104	10.2.141.156/30	10.2.141.157 – 10.2.141.158	10.2.141.159
105	10.2.141.160/30	10.2.141.161 – 10.2.141.162	10.2.141.163
106	10.2.141.164/30	10.2.141.165 – 10.2.141.166	10.2.141.167
107	10.2.141.168/30	10.2.141.169 – 10.2.141.170	10.2.141.171
108	10.2.141.172/30	10.2.141.173 – 10.2.141.174	10.2.141.175
109	10.2.141.176/30	10.2.141.177 – 10.2.141.178	10.2.141.179
110	10.2.141.180/30	10.2.141.181 – 10.2.141.182	10.2.141.183
111	10.2.141.184/30	10.2.141.185 – 10.2.141.186	10.2.141.187
112	10.2.141.188/30	10.2.141.189 – 10.2.141.190	10.2.141.191
113	10.2.141.192/30	10.2.141.193 – 10.2.141.194	10.2.141.195
114	10.2.141.196/30	10.2.141.197 – 10.2.141.198	10.2.141.199
115	10.2.141.200/30	10.2.141.201 – 10.2.141.202	10.2.141.203
116	10.2.141.204/30	10.2.141.205 – 10.2.141.206	10.2.141.207
117	10.2.141.208/30	10.2.141.209 – 10.2.141.210	10.2.141.211
118	10.2.141.212/30	10.2.141.213 – 10.2.141.214	10.2.141.215
119	10.2.141.216/30	10.2.141.217 – 10.2.141.218	10.2.141.219
120	10.2.141.220/30	10.2.141.221 – 10.2.141.222	10.2.141.223
121	10.2.141.224/30	10.2.141.225 – 10.2.141.226	10.2.141.227
122	10.2.141.228/30	10.2.141.229 – 10.2.141.230	10.2.141.231
123	10.2.141.232/30	10.2.141.233 – 10.2.141.234	10.2.141.235
124	10.2.141.236/30	10.2.141.237 – 10.2.141.238	10.2.141.239
125	10.2.141.240/30	10.2.141.241 – 10.2.141.242	10.2.141.243
126	10.2.141.244/30	10.2.141.245 – 10.2.141.246	10.2.141.247
127	10.2.141.248/30	10.2.141.249 – 10.2.141.250	10.2.141.251
128	10.2.141.252/30	10.2.141.253 – 10.2.141.254	10.2.141.255

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 →