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)10.0.142.0/23

network10.0.142.0/23

broadcast10.0.143.255

first host10.0.142.1

last host10.0.143.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.0.142.0/23

address00001010.00000000.10001110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000000.10001110.00000000

broadcast00001010.00000000.10001111.11111111

green = network part, grey = host part

hex0x0a008e00

decimal167808512

reverse dns0.142.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:8e00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.142.0/30	10.0.142.1 – 10.0.142.2	10.0.142.3
2	10.0.142.4/30	10.0.142.5 – 10.0.142.6	10.0.142.7
3	10.0.142.8/30	10.0.142.9 – 10.0.142.10	10.0.142.11
4	10.0.142.12/30	10.0.142.13 – 10.0.142.14	10.0.142.15
5	10.0.142.16/30	10.0.142.17 – 10.0.142.18	10.0.142.19
6	10.0.142.20/30	10.0.142.21 – 10.0.142.22	10.0.142.23
7	10.0.142.24/30	10.0.142.25 – 10.0.142.26	10.0.142.27
8	10.0.142.28/30	10.0.142.29 – 10.0.142.30	10.0.142.31
9	10.0.142.32/30	10.0.142.33 – 10.0.142.34	10.0.142.35
10	10.0.142.36/30	10.0.142.37 – 10.0.142.38	10.0.142.39
11	10.0.142.40/30	10.0.142.41 – 10.0.142.42	10.0.142.43
12	10.0.142.44/30	10.0.142.45 – 10.0.142.46	10.0.142.47
13	10.0.142.48/30	10.0.142.49 – 10.0.142.50	10.0.142.51
14	10.0.142.52/30	10.0.142.53 – 10.0.142.54	10.0.142.55
15	10.0.142.56/30	10.0.142.57 – 10.0.142.58	10.0.142.59
16	10.0.142.60/30	10.0.142.61 – 10.0.142.62	10.0.142.63
17	10.0.142.64/30	10.0.142.65 – 10.0.142.66	10.0.142.67
18	10.0.142.68/30	10.0.142.69 – 10.0.142.70	10.0.142.71
19	10.0.142.72/30	10.0.142.73 – 10.0.142.74	10.0.142.75
20	10.0.142.76/30	10.0.142.77 – 10.0.142.78	10.0.142.79
21	10.0.142.80/30	10.0.142.81 – 10.0.142.82	10.0.142.83
22	10.0.142.84/30	10.0.142.85 – 10.0.142.86	10.0.142.87
23	10.0.142.88/30	10.0.142.89 – 10.0.142.90	10.0.142.91
24	10.0.142.92/30	10.0.142.93 – 10.0.142.94	10.0.142.95
25	10.0.142.96/30	10.0.142.97 – 10.0.142.98	10.0.142.99
26	10.0.142.100/30	10.0.142.101 – 10.0.142.102	10.0.142.103
27	10.0.142.104/30	10.0.142.105 – 10.0.142.106	10.0.142.107
28	10.0.142.108/30	10.0.142.109 – 10.0.142.110	10.0.142.111
29	10.0.142.112/30	10.0.142.113 – 10.0.142.114	10.0.142.115
30	10.0.142.116/30	10.0.142.117 – 10.0.142.118	10.0.142.119
31	10.0.142.120/30	10.0.142.121 – 10.0.142.122	10.0.142.123
32	10.0.142.124/30	10.0.142.125 – 10.0.142.126	10.0.142.127
33	10.0.142.128/30	10.0.142.129 – 10.0.142.130	10.0.142.131
34	10.0.142.132/30	10.0.142.133 – 10.0.142.134	10.0.142.135
35	10.0.142.136/30	10.0.142.137 – 10.0.142.138	10.0.142.139
36	10.0.142.140/30	10.0.142.141 – 10.0.142.142	10.0.142.143
37	10.0.142.144/30	10.0.142.145 – 10.0.142.146	10.0.142.147
38	10.0.142.148/30	10.0.142.149 – 10.0.142.150	10.0.142.151
39	10.0.142.152/30	10.0.142.153 – 10.0.142.154	10.0.142.155
40	10.0.142.156/30	10.0.142.157 – 10.0.142.158	10.0.142.159
41	10.0.142.160/30	10.0.142.161 – 10.0.142.162	10.0.142.163
42	10.0.142.164/30	10.0.142.165 – 10.0.142.166	10.0.142.167
43	10.0.142.168/30	10.0.142.169 – 10.0.142.170	10.0.142.171
44	10.0.142.172/30	10.0.142.173 – 10.0.142.174	10.0.142.175
45	10.0.142.176/30	10.0.142.177 – 10.0.142.178	10.0.142.179
46	10.0.142.180/30	10.0.142.181 – 10.0.142.182	10.0.142.183
47	10.0.142.184/30	10.0.142.185 – 10.0.142.186	10.0.142.187
48	10.0.142.188/30	10.0.142.189 – 10.0.142.190	10.0.142.191
49	10.0.142.192/30	10.0.142.193 – 10.0.142.194	10.0.142.195
50	10.0.142.196/30	10.0.142.197 – 10.0.142.198	10.0.142.199
51	10.0.142.200/30	10.0.142.201 – 10.0.142.202	10.0.142.203
52	10.0.142.204/30	10.0.142.205 – 10.0.142.206	10.0.142.207
53	10.0.142.208/30	10.0.142.209 – 10.0.142.210	10.0.142.211
54	10.0.142.212/30	10.0.142.213 – 10.0.142.214	10.0.142.215
55	10.0.142.216/30	10.0.142.217 – 10.0.142.218	10.0.142.219
56	10.0.142.220/30	10.0.142.221 – 10.0.142.222	10.0.142.223
57	10.0.142.224/30	10.0.142.225 – 10.0.142.226	10.0.142.227
58	10.0.142.228/30	10.0.142.229 – 10.0.142.230	10.0.142.231
59	10.0.142.232/30	10.0.142.233 – 10.0.142.234	10.0.142.235
60	10.0.142.236/30	10.0.142.237 – 10.0.142.238	10.0.142.239
61	10.0.142.240/30	10.0.142.241 – 10.0.142.242	10.0.142.243
62	10.0.142.244/30	10.0.142.245 – 10.0.142.246	10.0.142.247
63	10.0.142.248/30	10.0.142.249 – 10.0.142.250	10.0.142.251
64	10.0.142.252/30	10.0.142.253 – 10.0.142.254	10.0.142.255
65	10.0.143.0/30	10.0.143.1 – 10.0.143.2	10.0.143.3
66	10.0.143.4/30	10.0.143.5 – 10.0.143.6	10.0.143.7
67	10.0.143.8/30	10.0.143.9 – 10.0.143.10	10.0.143.11
68	10.0.143.12/30	10.0.143.13 – 10.0.143.14	10.0.143.15
69	10.0.143.16/30	10.0.143.17 – 10.0.143.18	10.0.143.19
70	10.0.143.20/30	10.0.143.21 – 10.0.143.22	10.0.143.23
71	10.0.143.24/30	10.0.143.25 – 10.0.143.26	10.0.143.27
72	10.0.143.28/30	10.0.143.29 – 10.0.143.30	10.0.143.31
73	10.0.143.32/30	10.0.143.33 – 10.0.143.34	10.0.143.35
74	10.0.143.36/30	10.0.143.37 – 10.0.143.38	10.0.143.39
75	10.0.143.40/30	10.0.143.41 – 10.0.143.42	10.0.143.43
76	10.0.143.44/30	10.0.143.45 – 10.0.143.46	10.0.143.47
77	10.0.143.48/30	10.0.143.49 – 10.0.143.50	10.0.143.51
78	10.0.143.52/30	10.0.143.53 – 10.0.143.54	10.0.143.55
79	10.0.143.56/30	10.0.143.57 – 10.0.143.58	10.0.143.59
80	10.0.143.60/30	10.0.143.61 – 10.0.143.62	10.0.143.63
81	10.0.143.64/30	10.0.143.65 – 10.0.143.66	10.0.143.67
82	10.0.143.68/30	10.0.143.69 – 10.0.143.70	10.0.143.71
83	10.0.143.72/30	10.0.143.73 – 10.0.143.74	10.0.143.75
84	10.0.143.76/30	10.0.143.77 – 10.0.143.78	10.0.143.79
85	10.0.143.80/30	10.0.143.81 – 10.0.143.82	10.0.143.83
86	10.0.143.84/30	10.0.143.85 – 10.0.143.86	10.0.143.87
87	10.0.143.88/30	10.0.143.89 – 10.0.143.90	10.0.143.91
88	10.0.143.92/30	10.0.143.93 – 10.0.143.94	10.0.143.95
89	10.0.143.96/30	10.0.143.97 – 10.0.143.98	10.0.143.99
90	10.0.143.100/30	10.0.143.101 – 10.0.143.102	10.0.143.103
91	10.0.143.104/30	10.0.143.105 – 10.0.143.106	10.0.143.107
92	10.0.143.108/30	10.0.143.109 – 10.0.143.110	10.0.143.111
93	10.0.143.112/30	10.0.143.113 – 10.0.143.114	10.0.143.115
94	10.0.143.116/30	10.0.143.117 – 10.0.143.118	10.0.143.119
95	10.0.143.120/30	10.0.143.121 – 10.0.143.122	10.0.143.123
96	10.0.143.124/30	10.0.143.125 – 10.0.143.126	10.0.143.127
97	10.0.143.128/30	10.0.143.129 – 10.0.143.130	10.0.143.131
98	10.0.143.132/30	10.0.143.133 – 10.0.143.134	10.0.143.135
99	10.0.143.136/30	10.0.143.137 – 10.0.143.138	10.0.143.139
100	10.0.143.140/30	10.0.143.141 – 10.0.143.142	10.0.143.143
101	10.0.143.144/30	10.0.143.145 – 10.0.143.146	10.0.143.147
102	10.0.143.148/30	10.0.143.149 – 10.0.143.150	10.0.143.151
103	10.0.143.152/30	10.0.143.153 – 10.0.143.154	10.0.143.155
104	10.0.143.156/30	10.0.143.157 – 10.0.143.158	10.0.143.159
105	10.0.143.160/30	10.0.143.161 – 10.0.143.162	10.0.143.163
106	10.0.143.164/30	10.0.143.165 – 10.0.143.166	10.0.143.167
107	10.0.143.168/30	10.0.143.169 – 10.0.143.170	10.0.143.171
108	10.0.143.172/30	10.0.143.173 – 10.0.143.174	10.0.143.175
109	10.0.143.176/30	10.0.143.177 – 10.0.143.178	10.0.143.179
110	10.0.143.180/30	10.0.143.181 – 10.0.143.182	10.0.143.183
111	10.0.143.184/30	10.0.143.185 – 10.0.143.186	10.0.143.187
112	10.0.143.188/30	10.0.143.189 – 10.0.143.190	10.0.143.191
113	10.0.143.192/30	10.0.143.193 – 10.0.143.194	10.0.143.195
114	10.0.143.196/30	10.0.143.197 – 10.0.143.198	10.0.143.199
115	10.0.143.200/30	10.0.143.201 – 10.0.143.202	10.0.143.203
116	10.0.143.204/30	10.0.143.205 – 10.0.143.206	10.0.143.207
117	10.0.143.208/30	10.0.143.209 – 10.0.143.210	10.0.143.211
118	10.0.143.212/30	10.0.143.213 – 10.0.143.214	10.0.143.215
119	10.0.143.216/30	10.0.143.217 – 10.0.143.218	10.0.143.219
120	10.0.143.220/30	10.0.143.221 – 10.0.143.222	10.0.143.223
121	10.0.143.224/30	10.0.143.225 – 10.0.143.226	10.0.143.227
122	10.0.143.228/30	10.0.143.229 – 10.0.143.230	10.0.143.231
123	10.0.143.232/30	10.0.143.233 – 10.0.143.234	10.0.143.235
124	10.0.143.236/30	10.0.143.237 – 10.0.143.238	10.0.143.239
125	10.0.143.240/30	10.0.143.241 – 10.0.143.242	10.0.143.243
126	10.0.143.244/30	10.0.143.245 – 10.0.143.246	10.0.143.247
127	10.0.143.248/30	10.0.143.249 – 10.0.143.250	10.0.143.251
128	10.0.143.252/30	10.0.143.253 – 10.0.143.254	10.0.143.255

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 →