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)10.2.126.0/23

network10.2.126.0/23

broadcast10.2.127.255

first host10.2.126.1

last host10.2.127.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.126.0/23

address00001010.00000010.01111110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.01111110.00000000

broadcast00001010.00000010.01111111.11111111

green = network part, grey = host part

hex0x0a027e00

decimal167935488

reverse dns0.126.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:7e00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.126.0/30	10.2.126.1 – 10.2.126.2	10.2.126.3
2	10.2.126.4/30	10.2.126.5 – 10.2.126.6	10.2.126.7
3	10.2.126.8/30	10.2.126.9 – 10.2.126.10	10.2.126.11
4	10.2.126.12/30	10.2.126.13 – 10.2.126.14	10.2.126.15
5	10.2.126.16/30	10.2.126.17 – 10.2.126.18	10.2.126.19
6	10.2.126.20/30	10.2.126.21 – 10.2.126.22	10.2.126.23
7	10.2.126.24/30	10.2.126.25 – 10.2.126.26	10.2.126.27
8	10.2.126.28/30	10.2.126.29 – 10.2.126.30	10.2.126.31
9	10.2.126.32/30	10.2.126.33 – 10.2.126.34	10.2.126.35
10	10.2.126.36/30	10.2.126.37 – 10.2.126.38	10.2.126.39
11	10.2.126.40/30	10.2.126.41 – 10.2.126.42	10.2.126.43
12	10.2.126.44/30	10.2.126.45 – 10.2.126.46	10.2.126.47
13	10.2.126.48/30	10.2.126.49 – 10.2.126.50	10.2.126.51
14	10.2.126.52/30	10.2.126.53 – 10.2.126.54	10.2.126.55
15	10.2.126.56/30	10.2.126.57 – 10.2.126.58	10.2.126.59
16	10.2.126.60/30	10.2.126.61 – 10.2.126.62	10.2.126.63
17	10.2.126.64/30	10.2.126.65 – 10.2.126.66	10.2.126.67
18	10.2.126.68/30	10.2.126.69 – 10.2.126.70	10.2.126.71
19	10.2.126.72/30	10.2.126.73 – 10.2.126.74	10.2.126.75
20	10.2.126.76/30	10.2.126.77 – 10.2.126.78	10.2.126.79
21	10.2.126.80/30	10.2.126.81 – 10.2.126.82	10.2.126.83
22	10.2.126.84/30	10.2.126.85 – 10.2.126.86	10.2.126.87
23	10.2.126.88/30	10.2.126.89 – 10.2.126.90	10.2.126.91
24	10.2.126.92/30	10.2.126.93 – 10.2.126.94	10.2.126.95
25	10.2.126.96/30	10.2.126.97 – 10.2.126.98	10.2.126.99
26	10.2.126.100/30	10.2.126.101 – 10.2.126.102	10.2.126.103
27	10.2.126.104/30	10.2.126.105 – 10.2.126.106	10.2.126.107
28	10.2.126.108/30	10.2.126.109 – 10.2.126.110	10.2.126.111
29	10.2.126.112/30	10.2.126.113 – 10.2.126.114	10.2.126.115
30	10.2.126.116/30	10.2.126.117 – 10.2.126.118	10.2.126.119
31	10.2.126.120/30	10.2.126.121 – 10.2.126.122	10.2.126.123
32	10.2.126.124/30	10.2.126.125 – 10.2.126.126	10.2.126.127
33	10.2.126.128/30	10.2.126.129 – 10.2.126.130	10.2.126.131
34	10.2.126.132/30	10.2.126.133 – 10.2.126.134	10.2.126.135
35	10.2.126.136/30	10.2.126.137 – 10.2.126.138	10.2.126.139
36	10.2.126.140/30	10.2.126.141 – 10.2.126.142	10.2.126.143
37	10.2.126.144/30	10.2.126.145 – 10.2.126.146	10.2.126.147
38	10.2.126.148/30	10.2.126.149 – 10.2.126.150	10.2.126.151
39	10.2.126.152/30	10.2.126.153 – 10.2.126.154	10.2.126.155
40	10.2.126.156/30	10.2.126.157 – 10.2.126.158	10.2.126.159
41	10.2.126.160/30	10.2.126.161 – 10.2.126.162	10.2.126.163
42	10.2.126.164/30	10.2.126.165 – 10.2.126.166	10.2.126.167
43	10.2.126.168/30	10.2.126.169 – 10.2.126.170	10.2.126.171
44	10.2.126.172/30	10.2.126.173 – 10.2.126.174	10.2.126.175
45	10.2.126.176/30	10.2.126.177 – 10.2.126.178	10.2.126.179
46	10.2.126.180/30	10.2.126.181 – 10.2.126.182	10.2.126.183
47	10.2.126.184/30	10.2.126.185 – 10.2.126.186	10.2.126.187
48	10.2.126.188/30	10.2.126.189 – 10.2.126.190	10.2.126.191
49	10.2.126.192/30	10.2.126.193 – 10.2.126.194	10.2.126.195
50	10.2.126.196/30	10.2.126.197 – 10.2.126.198	10.2.126.199
51	10.2.126.200/30	10.2.126.201 – 10.2.126.202	10.2.126.203
52	10.2.126.204/30	10.2.126.205 – 10.2.126.206	10.2.126.207
53	10.2.126.208/30	10.2.126.209 – 10.2.126.210	10.2.126.211
54	10.2.126.212/30	10.2.126.213 – 10.2.126.214	10.2.126.215
55	10.2.126.216/30	10.2.126.217 – 10.2.126.218	10.2.126.219
56	10.2.126.220/30	10.2.126.221 – 10.2.126.222	10.2.126.223
57	10.2.126.224/30	10.2.126.225 – 10.2.126.226	10.2.126.227
58	10.2.126.228/30	10.2.126.229 – 10.2.126.230	10.2.126.231
59	10.2.126.232/30	10.2.126.233 – 10.2.126.234	10.2.126.235
60	10.2.126.236/30	10.2.126.237 – 10.2.126.238	10.2.126.239
61	10.2.126.240/30	10.2.126.241 – 10.2.126.242	10.2.126.243
62	10.2.126.244/30	10.2.126.245 – 10.2.126.246	10.2.126.247
63	10.2.126.248/30	10.2.126.249 – 10.2.126.250	10.2.126.251
64	10.2.126.252/30	10.2.126.253 – 10.2.126.254	10.2.126.255
65	10.2.127.0/30	10.2.127.1 – 10.2.127.2	10.2.127.3
66	10.2.127.4/30	10.2.127.5 – 10.2.127.6	10.2.127.7
67	10.2.127.8/30	10.2.127.9 – 10.2.127.10	10.2.127.11
68	10.2.127.12/30	10.2.127.13 – 10.2.127.14	10.2.127.15
69	10.2.127.16/30	10.2.127.17 – 10.2.127.18	10.2.127.19
70	10.2.127.20/30	10.2.127.21 – 10.2.127.22	10.2.127.23
71	10.2.127.24/30	10.2.127.25 – 10.2.127.26	10.2.127.27
72	10.2.127.28/30	10.2.127.29 – 10.2.127.30	10.2.127.31
73	10.2.127.32/30	10.2.127.33 – 10.2.127.34	10.2.127.35
74	10.2.127.36/30	10.2.127.37 – 10.2.127.38	10.2.127.39
75	10.2.127.40/30	10.2.127.41 – 10.2.127.42	10.2.127.43
76	10.2.127.44/30	10.2.127.45 – 10.2.127.46	10.2.127.47
77	10.2.127.48/30	10.2.127.49 – 10.2.127.50	10.2.127.51
78	10.2.127.52/30	10.2.127.53 – 10.2.127.54	10.2.127.55
79	10.2.127.56/30	10.2.127.57 – 10.2.127.58	10.2.127.59
80	10.2.127.60/30	10.2.127.61 – 10.2.127.62	10.2.127.63
81	10.2.127.64/30	10.2.127.65 – 10.2.127.66	10.2.127.67
82	10.2.127.68/30	10.2.127.69 – 10.2.127.70	10.2.127.71
83	10.2.127.72/30	10.2.127.73 – 10.2.127.74	10.2.127.75
84	10.2.127.76/30	10.2.127.77 – 10.2.127.78	10.2.127.79
85	10.2.127.80/30	10.2.127.81 – 10.2.127.82	10.2.127.83
86	10.2.127.84/30	10.2.127.85 – 10.2.127.86	10.2.127.87
87	10.2.127.88/30	10.2.127.89 – 10.2.127.90	10.2.127.91
88	10.2.127.92/30	10.2.127.93 – 10.2.127.94	10.2.127.95
89	10.2.127.96/30	10.2.127.97 – 10.2.127.98	10.2.127.99
90	10.2.127.100/30	10.2.127.101 – 10.2.127.102	10.2.127.103
91	10.2.127.104/30	10.2.127.105 – 10.2.127.106	10.2.127.107
92	10.2.127.108/30	10.2.127.109 – 10.2.127.110	10.2.127.111
93	10.2.127.112/30	10.2.127.113 – 10.2.127.114	10.2.127.115
94	10.2.127.116/30	10.2.127.117 – 10.2.127.118	10.2.127.119
95	10.2.127.120/30	10.2.127.121 – 10.2.127.122	10.2.127.123
96	10.2.127.124/30	10.2.127.125 – 10.2.127.126	10.2.127.127
97	10.2.127.128/30	10.2.127.129 – 10.2.127.130	10.2.127.131
98	10.2.127.132/30	10.2.127.133 – 10.2.127.134	10.2.127.135
99	10.2.127.136/30	10.2.127.137 – 10.2.127.138	10.2.127.139
100	10.2.127.140/30	10.2.127.141 – 10.2.127.142	10.2.127.143
101	10.2.127.144/30	10.2.127.145 – 10.2.127.146	10.2.127.147
102	10.2.127.148/30	10.2.127.149 – 10.2.127.150	10.2.127.151
103	10.2.127.152/30	10.2.127.153 – 10.2.127.154	10.2.127.155
104	10.2.127.156/30	10.2.127.157 – 10.2.127.158	10.2.127.159
105	10.2.127.160/30	10.2.127.161 – 10.2.127.162	10.2.127.163
106	10.2.127.164/30	10.2.127.165 – 10.2.127.166	10.2.127.167
107	10.2.127.168/30	10.2.127.169 – 10.2.127.170	10.2.127.171
108	10.2.127.172/30	10.2.127.173 – 10.2.127.174	10.2.127.175
109	10.2.127.176/30	10.2.127.177 – 10.2.127.178	10.2.127.179
110	10.2.127.180/30	10.2.127.181 – 10.2.127.182	10.2.127.183
111	10.2.127.184/30	10.2.127.185 – 10.2.127.186	10.2.127.187
112	10.2.127.188/30	10.2.127.189 – 10.2.127.190	10.2.127.191
113	10.2.127.192/30	10.2.127.193 – 10.2.127.194	10.2.127.195
114	10.2.127.196/30	10.2.127.197 – 10.2.127.198	10.2.127.199
115	10.2.127.200/30	10.2.127.201 – 10.2.127.202	10.2.127.203
116	10.2.127.204/30	10.2.127.205 – 10.2.127.206	10.2.127.207
117	10.2.127.208/30	10.2.127.209 – 10.2.127.210	10.2.127.211
118	10.2.127.212/30	10.2.127.213 – 10.2.127.214	10.2.127.215
119	10.2.127.216/30	10.2.127.217 – 10.2.127.218	10.2.127.219
120	10.2.127.220/30	10.2.127.221 – 10.2.127.222	10.2.127.223
121	10.2.127.224/30	10.2.127.225 – 10.2.127.226	10.2.127.227
122	10.2.127.228/30	10.2.127.229 – 10.2.127.230	10.2.127.231
123	10.2.127.232/30	10.2.127.233 – 10.2.127.234	10.2.127.235
124	10.2.127.236/30	10.2.127.237 – 10.2.127.238	10.2.127.239
125	10.2.127.240/30	10.2.127.241 – 10.2.127.242	10.2.127.243
126	10.2.127.244/30	10.2.127.245 – 10.2.127.246	10.2.127.247
127	10.2.127.248/30	10.2.127.249 – 10.2.127.250	10.2.127.251
128	10.2.127.252/30	10.2.127.253 – 10.2.127.254	10.2.127.255

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 →