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)10.2.246.0/23

network10.2.246.0/23

broadcast10.2.247.255

first host10.2.246.1

last host10.2.247.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.246.0/23

address00001010.00000010.11110110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.11110110.00000000

broadcast00001010.00000010.11110111.11111111

green = network part, grey = host part

hex0x0a02f600

decimal167966208

reverse dns0.246.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:f600

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.246.0/30	10.2.246.1 – 10.2.246.2	10.2.246.3
2	10.2.246.4/30	10.2.246.5 – 10.2.246.6	10.2.246.7
3	10.2.246.8/30	10.2.246.9 – 10.2.246.10	10.2.246.11
4	10.2.246.12/30	10.2.246.13 – 10.2.246.14	10.2.246.15
5	10.2.246.16/30	10.2.246.17 – 10.2.246.18	10.2.246.19
6	10.2.246.20/30	10.2.246.21 – 10.2.246.22	10.2.246.23
7	10.2.246.24/30	10.2.246.25 – 10.2.246.26	10.2.246.27
8	10.2.246.28/30	10.2.246.29 – 10.2.246.30	10.2.246.31
9	10.2.246.32/30	10.2.246.33 – 10.2.246.34	10.2.246.35
10	10.2.246.36/30	10.2.246.37 – 10.2.246.38	10.2.246.39
11	10.2.246.40/30	10.2.246.41 – 10.2.246.42	10.2.246.43
12	10.2.246.44/30	10.2.246.45 – 10.2.246.46	10.2.246.47
13	10.2.246.48/30	10.2.246.49 – 10.2.246.50	10.2.246.51
14	10.2.246.52/30	10.2.246.53 – 10.2.246.54	10.2.246.55
15	10.2.246.56/30	10.2.246.57 – 10.2.246.58	10.2.246.59
16	10.2.246.60/30	10.2.246.61 – 10.2.246.62	10.2.246.63
17	10.2.246.64/30	10.2.246.65 – 10.2.246.66	10.2.246.67
18	10.2.246.68/30	10.2.246.69 – 10.2.246.70	10.2.246.71
19	10.2.246.72/30	10.2.246.73 – 10.2.246.74	10.2.246.75
20	10.2.246.76/30	10.2.246.77 – 10.2.246.78	10.2.246.79
21	10.2.246.80/30	10.2.246.81 – 10.2.246.82	10.2.246.83
22	10.2.246.84/30	10.2.246.85 – 10.2.246.86	10.2.246.87
23	10.2.246.88/30	10.2.246.89 – 10.2.246.90	10.2.246.91
24	10.2.246.92/30	10.2.246.93 – 10.2.246.94	10.2.246.95
25	10.2.246.96/30	10.2.246.97 – 10.2.246.98	10.2.246.99
26	10.2.246.100/30	10.2.246.101 – 10.2.246.102	10.2.246.103
27	10.2.246.104/30	10.2.246.105 – 10.2.246.106	10.2.246.107
28	10.2.246.108/30	10.2.246.109 – 10.2.246.110	10.2.246.111
29	10.2.246.112/30	10.2.246.113 – 10.2.246.114	10.2.246.115
30	10.2.246.116/30	10.2.246.117 – 10.2.246.118	10.2.246.119
31	10.2.246.120/30	10.2.246.121 – 10.2.246.122	10.2.246.123
32	10.2.246.124/30	10.2.246.125 – 10.2.246.126	10.2.246.127
33	10.2.246.128/30	10.2.246.129 – 10.2.246.130	10.2.246.131
34	10.2.246.132/30	10.2.246.133 – 10.2.246.134	10.2.246.135
35	10.2.246.136/30	10.2.246.137 – 10.2.246.138	10.2.246.139
36	10.2.246.140/30	10.2.246.141 – 10.2.246.142	10.2.246.143
37	10.2.246.144/30	10.2.246.145 – 10.2.246.146	10.2.246.147
38	10.2.246.148/30	10.2.246.149 – 10.2.246.150	10.2.246.151
39	10.2.246.152/30	10.2.246.153 – 10.2.246.154	10.2.246.155
40	10.2.246.156/30	10.2.246.157 – 10.2.246.158	10.2.246.159
41	10.2.246.160/30	10.2.246.161 – 10.2.246.162	10.2.246.163
42	10.2.246.164/30	10.2.246.165 – 10.2.246.166	10.2.246.167
43	10.2.246.168/30	10.2.246.169 – 10.2.246.170	10.2.246.171
44	10.2.246.172/30	10.2.246.173 – 10.2.246.174	10.2.246.175
45	10.2.246.176/30	10.2.246.177 – 10.2.246.178	10.2.246.179
46	10.2.246.180/30	10.2.246.181 – 10.2.246.182	10.2.246.183
47	10.2.246.184/30	10.2.246.185 – 10.2.246.186	10.2.246.187
48	10.2.246.188/30	10.2.246.189 – 10.2.246.190	10.2.246.191
49	10.2.246.192/30	10.2.246.193 – 10.2.246.194	10.2.246.195
50	10.2.246.196/30	10.2.246.197 – 10.2.246.198	10.2.246.199
51	10.2.246.200/30	10.2.246.201 – 10.2.246.202	10.2.246.203
52	10.2.246.204/30	10.2.246.205 – 10.2.246.206	10.2.246.207
53	10.2.246.208/30	10.2.246.209 – 10.2.246.210	10.2.246.211
54	10.2.246.212/30	10.2.246.213 – 10.2.246.214	10.2.246.215
55	10.2.246.216/30	10.2.246.217 – 10.2.246.218	10.2.246.219
56	10.2.246.220/30	10.2.246.221 – 10.2.246.222	10.2.246.223
57	10.2.246.224/30	10.2.246.225 – 10.2.246.226	10.2.246.227
58	10.2.246.228/30	10.2.246.229 – 10.2.246.230	10.2.246.231
59	10.2.246.232/30	10.2.246.233 – 10.2.246.234	10.2.246.235
60	10.2.246.236/30	10.2.246.237 – 10.2.246.238	10.2.246.239
61	10.2.246.240/30	10.2.246.241 – 10.2.246.242	10.2.246.243
62	10.2.246.244/30	10.2.246.245 – 10.2.246.246	10.2.246.247
63	10.2.246.248/30	10.2.246.249 – 10.2.246.250	10.2.246.251
64	10.2.246.252/30	10.2.246.253 – 10.2.246.254	10.2.246.255
65	10.2.247.0/30	10.2.247.1 – 10.2.247.2	10.2.247.3
66	10.2.247.4/30	10.2.247.5 – 10.2.247.6	10.2.247.7
67	10.2.247.8/30	10.2.247.9 – 10.2.247.10	10.2.247.11
68	10.2.247.12/30	10.2.247.13 – 10.2.247.14	10.2.247.15
69	10.2.247.16/30	10.2.247.17 – 10.2.247.18	10.2.247.19
70	10.2.247.20/30	10.2.247.21 – 10.2.247.22	10.2.247.23
71	10.2.247.24/30	10.2.247.25 – 10.2.247.26	10.2.247.27
72	10.2.247.28/30	10.2.247.29 – 10.2.247.30	10.2.247.31
73	10.2.247.32/30	10.2.247.33 – 10.2.247.34	10.2.247.35
74	10.2.247.36/30	10.2.247.37 – 10.2.247.38	10.2.247.39
75	10.2.247.40/30	10.2.247.41 – 10.2.247.42	10.2.247.43
76	10.2.247.44/30	10.2.247.45 – 10.2.247.46	10.2.247.47
77	10.2.247.48/30	10.2.247.49 – 10.2.247.50	10.2.247.51
78	10.2.247.52/30	10.2.247.53 – 10.2.247.54	10.2.247.55
79	10.2.247.56/30	10.2.247.57 – 10.2.247.58	10.2.247.59
80	10.2.247.60/30	10.2.247.61 – 10.2.247.62	10.2.247.63
81	10.2.247.64/30	10.2.247.65 – 10.2.247.66	10.2.247.67
82	10.2.247.68/30	10.2.247.69 – 10.2.247.70	10.2.247.71
83	10.2.247.72/30	10.2.247.73 – 10.2.247.74	10.2.247.75
84	10.2.247.76/30	10.2.247.77 – 10.2.247.78	10.2.247.79
85	10.2.247.80/30	10.2.247.81 – 10.2.247.82	10.2.247.83
86	10.2.247.84/30	10.2.247.85 – 10.2.247.86	10.2.247.87
87	10.2.247.88/30	10.2.247.89 – 10.2.247.90	10.2.247.91
88	10.2.247.92/30	10.2.247.93 – 10.2.247.94	10.2.247.95
89	10.2.247.96/30	10.2.247.97 – 10.2.247.98	10.2.247.99
90	10.2.247.100/30	10.2.247.101 – 10.2.247.102	10.2.247.103
91	10.2.247.104/30	10.2.247.105 – 10.2.247.106	10.2.247.107
92	10.2.247.108/30	10.2.247.109 – 10.2.247.110	10.2.247.111
93	10.2.247.112/30	10.2.247.113 – 10.2.247.114	10.2.247.115
94	10.2.247.116/30	10.2.247.117 – 10.2.247.118	10.2.247.119
95	10.2.247.120/30	10.2.247.121 – 10.2.247.122	10.2.247.123
96	10.2.247.124/30	10.2.247.125 – 10.2.247.126	10.2.247.127
97	10.2.247.128/30	10.2.247.129 – 10.2.247.130	10.2.247.131
98	10.2.247.132/30	10.2.247.133 – 10.2.247.134	10.2.247.135
99	10.2.247.136/30	10.2.247.137 – 10.2.247.138	10.2.247.139
100	10.2.247.140/30	10.2.247.141 – 10.2.247.142	10.2.247.143
101	10.2.247.144/30	10.2.247.145 – 10.2.247.146	10.2.247.147
102	10.2.247.148/30	10.2.247.149 – 10.2.247.150	10.2.247.151
103	10.2.247.152/30	10.2.247.153 – 10.2.247.154	10.2.247.155
104	10.2.247.156/30	10.2.247.157 – 10.2.247.158	10.2.247.159
105	10.2.247.160/30	10.2.247.161 – 10.2.247.162	10.2.247.163
106	10.2.247.164/30	10.2.247.165 – 10.2.247.166	10.2.247.167
107	10.2.247.168/30	10.2.247.169 – 10.2.247.170	10.2.247.171
108	10.2.247.172/30	10.2.247.173 – 10.2.247.174	10.2.247.175
109	10.2.247.176/30	10.2.247.177 – 10.2.247.178	10.2.247.179
110	10.2.247.180/30	10.2.247.181 – 10.2.247.182	10.2.247.183
111	10.2.247.184/30	10.2.247.185 – 10.2.247.186	10.2.247.187
112	10.2.247.188/30	10.2.247.189 – 10.2.247.190	10.2.247.191
113	10.2.247.192/30	10.2.247.193 – 10.2.247.194	10.2.247.195
114	10.2.247.196/30	10.2.247.197 – 10.2.247.198	10.2.247.199
115	10.2.247.200/30	10.2.247.201 – 10.2.247.202	10.2.247.203
116	10.2.247.204/30	10.2.247.205 – 10.2.247.206	10.2.247.207
117	10.2.247.208/30	10.2.247.209 – 10.2.247.210	10.2.247.211
118	10.2.247.212/30	10.2.247.213 – 10.2.247.214	10.2.247.215
119	10.2.247.216/30	10.2.247.217 – 10.2.247.218	10.2.247.219
120	10.2.247.220/30	10.2.247.221 – 10.2.247.222	10.2.247.223
121	10.2.247.224/30	10.2.247.225 – 10.2.247.226	10.2.247.227
122	10.2.247.228/30	10.2.247.229 – 10.2.247.230	10.2.247.231
123	10.2.247.232/30	10.2.247.233 – 10.2.247.234	10.2.247.235
124	10.2.247.236/30	10.2.247.237 – 10.2.247.238	10.2.247.239
125	10.2.247.240/30	10.2.247.241 – 10.2.247.242	10.2.247.243
126	10.2.247.244/30	10.2.247.245 – 10.2.247.246	10.2.247.247
127	10.2.247.248/30	10.2.247.249 – 10.2.247.250	10.2.247.251
128	10.2.247.252/30	10.2.247.253 – 10.2.247.254	10.2.247.255

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 →