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)10.2.6.0/23

network10.2.6.0/23

broadcast10.2.7.255

first host10.2.6.1

last host10.2.7.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.6.0/23

address00001010.00000010.00000110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.00000110.00000000

broadcast00001010.00000010.00000111.11111111

green = network part, grey = host part

hex0x0a020600

decimal167904768

reverse dns0.6.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:600

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.6.0/30	10.2.6.1 – 10.2.6.2	10.2.6.3
2	10.2.6.4/30	10.2.6.5 – 10.2.6.6	10.2.6.7
3	10.2.6.8/30	10.2.6.9 – 10.2.6.10	10.2.6.11
4	10.2.6.12/30	10.2.6.13 – 10.2.6.14	10.2.6.15
5	10.2.6.16/30	10.2.6.17 – 10.2.6.18	10.2.6.19
6	10.2.6.20/30	10.2.6.21 – 10.2.6.22	10.2.6.23
7	10.2.6.24/30	10.2.6.25 – 10.2.6.26	10.2.6.27
8	10.2.6.28/30	10.2.6.29 – 10.2.6.30	10.2.6.31
9	10.2.6.32/30	10.2.6.33 – 10.2.6.34	10.2.6.35
10	10.2.6.36/30	10.2.6.37 – 10.2.6.38	10.2.6.39
11	10.2.6.40/30	10.2.6.41 – 10.2.6.42	10.2.6.43
12	10.2.6.44/30	10.2.6.45 – 10.2.6.46	10.2.6.47
13	10.2.6.48/30	10.2.6.49 – 10.2.6.50	10.2.6.51
14	10.2.6.52/30	10.2.6.53 – 10.2.6.54	10.2.6.55
15	10.2.6.56/30	10.2.6.57 – 10.2.6.58	10.2.6.59
16	10.2.6.60/30	10.2.6.61 – 10.2.6.62	10.2.6.63
17	10.2.6.64/30	10.2.6.65 – 10.2.6.66	10.2.6.67
18	10.2.6.68/30	10.2.6.69 – 10.2.6.70	10.2.6.71
19	10.2.6.72/30	10.2.6.73 – 10.2.6.74	10.2.6.75
20	10.2.6.76/30	10.2.6.77 – 10.2.6.78	10.2.6.79
21	10.2.6.80/30	10.2.6.81 – 10.2.6.82	10.2.6.83
22	10.2.6.84/30	10.2.6.85 – 10.2.6.86	10.2.6.87
23	10.2.6.88/30	10.2.6.89 – 10.2.6.90	10.2.6.91
24	10.2.6.92/30	10.2.6.93 – 10.2.6.94	10.2.6.95
25	10.2.6.96/30	10.2.6.97 – 10.2.6.98	10.2.6.99
26	10.2.6.100/30	10.2.6.101 – 10.2.6.102	10.2.6.103
27	10.2.6.104/30	10.2.6.105 – 10.2.6.106	10.2.6.107
28	10.2.6.108/30	10.2.6.109 – 10.2.6.110	10.2.6.111
29	10.2.6.112/30	10.2.6.113 – 10.2.6.114	10.2.6.115
30	10.2.6.116/30	10.2.6.117 – 10.2.6.118	10.2.6.119
31	10.2.6.120/30	10.2.6.121 – 10.2.6.122	10.2.6.123
32	10.2.6.124/30	10.2.6.125 – 10.2.6.126	10.2.6.127
33	10.2.6.128/30	10.2.6.129 – 10.2.6.130	10.2.6.131
34	10.2.6.132/30	10.2.6.133 – 10.2.6.134	10.2.6.135
35	10.2.6.136/30	10.2.6.137 – 10.2.6.138	10.2.6.139
36	10.2.6.140/30	10.2.6.141 – 10.2.6.142	10.2.6.143
37	10.2.6.144/30	10.2.6.145 – 10.2.6.146	10.2.6.147
38	10.2.6.148/30	10.2.6.149 – 10.2.6.150	10.2.6.151
39	10.2.6.152/30	10.2.6.153 – 10.2.6.154	10.2.6.155
40	10.2.6.156/30	10.2.6.157 – 10.2.6.158	10.2.6.159
41	10.2.6.160/30	10.2.6.161 – 10.2.6.162	10.2.6.163
42	10.2.6.164/30	10.2.6.165 – 10.2.6.166	10.2.6.167
43	10.2.6.168/30	10.2.6.169 – 10.2.6.170	10.2.6.171
44	10.2.6.172/30	10.2.6.173 – 10.2.6.174	10.2.6.175
45	10.2.6.176/30	10.2.6.177 – 10.2.6.178	10.2.6.179
46	10.2.6.180/30	10.2.6.181 – 10.2.6.182	10.2.6.183
47	10.2.6.184/30	10.2.6.185 – 10.2.6.186	10.2.6.187
48	10.2.6.188/30	10.2.6.189 – 10.2.6.190	10.2.6.191
49	10.2.6.192/30	10.2.6.193 – 10.2.6.194	10.2.6.195
50	10.2.6.196/30	10.2.6.197 – 10.2.6.198	10.2.6.199
51	10.2.6.200/30	10.2.6.201 – 10.2.6.202	10.2.6.203
52	10.2.6.204/30	10.2.6.205 – 10.2.6.206	10.2.6.207
53	10.2.6.208/30	10.2.6.209 – 10.2.6.210	10.2.6.211
54	10.2.6.212/30	10.2.6.213 – 10.2.6.214	10.2.6.215
55	10.2.6.216/30	10.2.6.217 – 10.2.6.218	10.2.6.219
56	10.2.6.220/30	10.2.6.221 – 10.2.6.222	10.2.6.223
57	10.2.6.224/30	10.2.6.225 – 10.2.6.226	10.2.6.227
58	10.2.6.228/30	10.2.6.229 – 10.2.6.230	10.2.6.231
59	10.2.6.232/30	10.2.6.233 – 10.2.6.234	10.2.6.235
60	10.2.6.236/30	10.2.6.237 – 10.2.6.238	10.2.6.239
61	10.2.6.240/30	10.2.6.241 – 10.2.6.242	10.2.6.243
62	10.2.6.244/30	10.2.6.245 – 10.2.6.246	10.2.6.247
63	10.2.6.248/30	10.2.6.249 – 10.2.6.250	10.2.6.251
64	10.2.6.252/30	10.2.6.253 – 10.2.6.254	10.2.6.255
65	10.2.7.0/30	10.2.7.1 – 10.2.7.2	10.2.7.3
66	10.2.7.4/30	10.2.7.5 – 10.2.7.6	10.2.7.7
67	10.2.7.8/30	10.2.7.9 – 10.2.7.10	10.2.7.11
68	10.2.7.12/30	10.2.7.13 – 10.2.7.14	10.2.7.15
69	10.2.7.16/30	10.2.7.17 – 10.2.7.18	10.2.7.19
70	10.2.7.20/30	10.2.7.21 – 10.2.7.22	10.2.7.23
71	10.2.7.24/30	10.2.7.25 – 10.2.7.26	10.2.7.27
72	10.2.7.28/30	10.2.7.29 – 10.2.7.30	10.2.7.31
73	10.2.7.32/30	10.2.7.33 – 10.2.7.34	10.2.7.35
74	10.2.7.36/30	10.2.7.37 – 10.2.7.38	10.2.7.39
75	10.2.7.40/30	10.2.7.41 – 10.2.7.42	10.2.7.43
76	10.2.7.44/30	10.2.7.45 – 10.2.7.46	10.2.7.47
77	10.2.7.48/30	10.2.7.49 – 10.2.7.50	10.2.7.51
78	10.2.7.52/30	10.2.7.53 – 10.2.7.54	10.2.7.55
79	10.2.7.56/30	10.2.7.57 – 10.2.7.58	10.2.7.59
80	10.2.7.60/30	10.2.7.61 – 10.2.7.62	10.2.7.63
81	10.2.7.64/30	10.2.7.65 – 10.2.7.66	10.2.7.67
82	10.2.7.68/30	10.2.7.69 – 10.2.7.70	10.2.7.71
83	10.2.7.72/30	10.2.7.73 – 10.2.7.74	10.2.7.75
84	10.2.7.76/30	10.2.7.77 – 10.2.7.78	10.2.7.79
85	10.2.7.80/30	10.2.7.81 – 10.2.7.82	10.2.7.83
86	10.2.7.84/30	10.2.7.85 – 10.2.7.86	10.2.7.87
87	10.2.7.88/30	10.2.7.89 – 10.2.7.90	10.2.7.91
88	10.2.7.92/30	10.2.7.93 – 10.2.7.94	10.2.7.95
89	10.2.7.96/30	10.2.7.97 – 10.2.7.98	10.2.7.99
90	10.2.7.100/30	10.2.7.101 – 10.2.7.102	10.2.7.103
91	10.2.7.104/30	10.2.7.105 – 10.2.7.106	10.2.7.107
92	10.2.7.108/30	10.2.7.109 – 10.2.7.110	10.2.7.111
93	10.2.7.112/30	10.2.7.113 – 10.2.7.114	10.2.7.115
94	10.2.7.116/30	10.2.7.117 – 10.2.7.118	10.2.7.119
95	10.2.7.120/30	10.2.7.121 – 10.2.7.122	10.2.7.123
96	10.2.7.124/30	10.2.7.125 – 10.2.7.126	10.2.7.127
97	10.2.7.128/30	10.2.7.129 – 10.2.7.130	10.2.7.131
98	10.2.7.132/30	10.2.7.133 – 10.2.7.134	10.2.7.135
99	10.2.7.136/30	10.2.7.137 – 10.2.7.138	10.2.7.139
100	10.2.7.140/30	10.2.7.141 – 10.2.7.142	10.2.7.143
101	10.2.7.144/30	10.2.7.145 – 10.2.7.146	10.2.7.147
102	10.2.7.148/30	10.2.7.149 – 10.2.7.150	10.2.7.151
103	10.2.7.152/30	10.2.7.153 – 10.2.7.154	10.2.7.155
104	10.2.7.156/30	10.2.7.157 – 10.2.7.158	10.2.7.159
105	10.2.7.160/30	10.2.7.161 – 10.2.7.162	10.2.7.163
106	10.2.7.164/30	10.2.7.165 – 10.2.7.166	10.2.7.167
107	10.2.7.168/30	10.2.7.169 – 10.2.7.170	10.2.7.171
108	10.2.7.172/30	10.2.7.173 – 10.2.7.174	10.2.7.175
109	10.2.7.176/30	10.2.7.177 – 10.2.7.178	10.2.7.179
110	10.2.7.180/30	10.2.7.181 – 10.2.7.182	10.2.7.183
111	10.2.7.184/30	10.2.7.185 – 10.2.7.186	10.2.7.187
112	10.2.7.188/30	10.2.7.189 – 10.2.7.190	10.2.7.191
113	10.2.7.192/30	10.2.7.193 – 10.2.7.194	10.2.7.195
114	10.2.7.196/30	10.2.7.197 – 10.2.7.198	10.2.7.199
115	10.2.7.200/30	10.2.7.201 – 10.2.7.202	10.2.7.203
116	10.2.7.204/30	10.2.7.205 – 10.2.7.206	10.2.7.207
117	10.2.7.208/30	10.2.7.209 – 10.2.7.210	10.2.7.211
118	10.2.7.212/30	10.2.7.213 – 10.2.7.214	10.2.7.215
119	10.2.7.216/30	10.2.7.217 – 10.2.7.218	10.2.7.219
120	10.2.7.220/30	10.2.7.221 – 10.2.7.222	10.2.7.223
121	10.2.7.224/30	10.2.7.225 – 10.2.7.226	10.2.7.227
122	10.2.7.228/30	10.2.7.229 – 10.2.7.230	10.2.7.231
123	10.2.7.232/30	10.2.7.233 – 10.2.7.234	10.2.7.235
124	10.2.7.236/30	10.2.7.237 – 10.2.7.238	10.2.7.239
125	10.2.7.240/30	10.2.7.241 – 10.2.7.242	10.2.7.243
126	10.2.7.244/30	10.2.7.245 – 10.2.7.246	10.2.7.247
127	10.2.7.248/30	10.2.7.249 – 10.2.7.250	10.2.7.251
128	10.2.7.252/30	10.2.7.253 – 10.2.7.254	10.2.7.255

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 →