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)10.3.244.0/23

network10.3.244.0/23

broadcast10.3.245.255

first host10.3.244.1

last host10.3.245.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.3.244.0/23

address00001010.00000011.11110100.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000011.11110100.00000000

broadcast00001010.00000011.11110101.11111111

green = network part, grey = host part

hex0x0a03f400

decimal168031232

reverse dns0.244.3.10.in-addr.arpa

ipv4-mapped::ffff:a03:f400

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.3.244.0/30	10.3.244.1 – 10.3.244.2	10.3.244.3
2	10.3.244.4/30	10.3.244.5 – 10.3.244.6	10.3.244.7
3	10.3.244.8/30	10.3.244.9 – 10.3.244.10	10.3.244.11
4	10.3.244.12/30	10.3.244.13 – 10.3.244.14	10.3.244.15
5	10.3.244.16/30	10.3.244.17 – 10.3.244.18	10.3.244.19
6	10.3.244.20/30	10.3.244.21 – 10.3.244.22	10.3.244.23
7	10.3.244.24/30	10.3.244.25 – 10.3.244.26	10.3.244.27
8	10.3.244.28/30	10.3.244.29 – 10.3.244.30	10.3.244.31
9	10.3.244.32/30	10.3.244.33 – 10.3.244.34	10.3.244.35
10	10.3.244.36/30	10.3.244.37 – 10.3.244.38	10.3.244.39
11	10.3.244.40/30	10.3.244.41 – 10.3.244.42	10.3.244.43
12	10.3.244.44/30	10.3.244.45 – 10.3.244.46	10.3.244.47
13	10.3.244.48/30	10.3.244.49 – 10.3.244.50	10.3.244.51
14	10.3.244.52/30	10.3.244.53 – 10.3.244.54	10.3.244.55
15	10.3.244.56/30	10.3.244.57 – 10.3.244.58	10.3.244.59
16	10.3.244.60/30	10.3.244.61 – 10.3.244.62	10.3.244.63
17	10.3.244.64/30	10.3.244.65 – 10.3.244.66	10.3.244.67
18	10.3.244.68/30	10.3.244.69 – 10.3.244.70	10.3.244.71
19	10.3.244.72/30	10.3.244.73 – 10.3.244.74	10.3.244.75
20	10.3.244.76/30	10.3.244.77 – 10.3.244.78	10.3.244.79
21	10.3.244.80/30	10.3.244.81 – 10.3.244.82	10.3.244.83
22	10.3.244.84/30	10.3.244.85 – 10.3.244.86	10.3.244.87
23	10.3.244.88/30	10.3.244.89 – 10.3.244.90	10.3.244.91
24	10.3.244.92/30	10.3.244.93 – 10.3.244.94	10.3.244.95
25	10.3.244.96/30	10.3.244.97 – 10.3.244.98	10.3.244.99
26	10.3.244.100/30	10.3.244.101 – 10.3.244.102	10.3.244.103
27	10.3.244.104/30	10.3.244.105 – 10.3.244.106	10.3.244.107
28	10.3.244.108/30	10.3.244.109 – 10.3.244.110	10.3.244.111
29	10.3.244.112/30	10.3.244.113 – 10.3.244.114	10.3.244.115
30	10.3.244.116/30	10.3.244.117 – 10.3.244.118	10.3.244.119
31	10.3.244.120/30	10.3.244.121 – 10.3.244.122	10.3.244.123
32	10.3.244.124/30	10.3.244.125 – 10.3.244.126	10.3.244.127
33	10.3.244.128/30	10.3.244.129 – 10.3.244.130	10.3.244.131
34	10.3.244.132/30	10.3.244.133 – 10.3.244.134	10.3.244.135
35	10.3.244.136/30	10.3.244.137 – 10.3.244.138	10.3.244.139
36	10.3.244.140/30	10.3.244.141 – 10.3.244.142	10.3.244.143
37	10.3.244.144/30	10.3.244.145 – 10.3.244.146	10.3.244.147
38	10.3.244.148/30	10.3.244.149 – 10.3.244.150	10.3.244.151
39	10.3.244.152/30	10.3.244.153 – 10.3.244.154	10.3.244.155
40	10.3.244.156/30	10.3.244.157 – 10.3.244.158	10.3.244.159
41	10.3.244.160/30	10.3.244.161 – 10.3.244.162	10.3.244.163
42	10.3.244.164/30	10.3.244.165 – 10.3.244.166	10.3.244.167
43	10.3.244.168/30	10.3.244.169 – 10.3.244.170	10.3.244.171
44	10.3.244.172/30	10.3.244.173 – 10.3.244.174	10.3.244.175
45	10.3.244.176/30	10.3.244.177 – 10.3.244.178	10.3.244.179
46	10.3.244.180/30	10.3.244.181 – 10.3.244.182	10.3.244.183
47	10.3.244.184/30	10.3.244.185 – 10.3.244.186	10.3.244.187
48	10.3.244.188/30	10.3.244.189 – 10.3.244.190	10.3.244.191
49	10.3.244.192/30	10.3.244.193 – 10.3.244.194	10.3.244.195
50	10.3.244.196/30	10.3.244.197 – 10.3.244.198	10.3.244.199
51	10.3.244.200/30	10.3.244.201 – 10.3.244.202	10.3.244.203
52	10.3.244.204/30	10.3.244.205 – 10.3.244.206	10.3.244.207
53	10.3.244.208/30	10.3.244.209 – 10.3.244.210	10.3.244.211
54	10.3.244.212/30	10.3.244.213 – 10.3.244.214	10.3.244.215
55	10.3.244.216/30	10.3.244.217 – 10.3.244.218	10.3.244.219
56	10.3.244.220/30	10.3.244.221 – 10.3.244.222	10.3.244.223
57	10.3.244.224/30	10.3.244.225 – 10.3.244.226	10.3.244.227
58	10.3.244.228/30	10.3.244.229 – 10.3.244.230	10.3.244.231
59	10.3.244.232/30	10.3.244.233 – 10.3.244.234	10.3.244.235
60	10.3.244.236/30	10.3.244.237 – 10.3.244.238	10.3.244.239
61	10.3.244.240/30	10.3.244.241 – 10.3.244.242	10.3.244.243
62	10.3.244.244/30	10.3.244.245 – 10.3.244.246	10.3.244.247
63	10.3.244.248/30	10.3.244.249 – 10.3.244.250	10.3.244.251
64	10.3.244.252/30	10.3.244.253 – 10.3.244.254	10.3.244.255
65	10.3.245.0/30	10.3.245.1 – 10.3.245.2	10.3.245.3
66	10.3.245.4/30	10.3.245.5 – 10.3.245.6	10.3.245.7
67	10.3.245.8/30	10.3.245.9 – 10.3.245.10	10.3.245.11
68	10.3.245.12/30	10.3.245.13 – 10.3.245.14	10.3.245.15
69	10.3.245.16/30	10.3.245.17 – 10.3.245.18	10.3.245.19
70	10.3.245.20/30	10.3.245.21 – 10.3.245.22	10.3.245.23
71	10.3.245.24/30	10.3.245.25 – 10.3.245.26	10.3.245.27
72	10.3.245.28/30	10.3.245.29 – 10.3.245.30	10.3.245.31
73	10.3.245.32/30	10.3.245.33 – 10.3.245.34	10.3.245.35
74	10.3.245.36/30	10.3.245.37 – 10.3.245.38	10.3.245.39
75	10.3.245.40/30	10.3.245.41 – 10.3.245.42	10.3.245.43
76	10.3.245.44/30	10.3.245.45 – 10.3.245.46	10.3.245.47
77	10.3.245.48/30	10.3.245.49 – 10.3.245.50	10.3.245.51
78	10.3.245.52/30	10.3.245.53 – 10.3.245.54	10.3.245.55
79	10.3.245.56/30	10.3.245.57 – 10.3.245.58	10.3.245.59
80	10.3.245.60/30	10.3.245.61 – 10.3.245.62	10.3.245.63
81	10.3.245.64/30	10.3.245.65 – 10.3.245.66	10.3.245.67
82	10.3.245.68/30	10.3.245.69 – 10.3.245.70	10.3.245.71
83	10.3.245.72/30	10.3.245.73 – 10.3.245.74	10.3.245.75
84	10.3.245.76/30	10.3.245.77 – 10.3.245.78	10.3.245.79
85	10.3.245.80/30	10.3.245.81 – 10.3.245.82	10.3.245.83
86	10.3.245.84/30	10.3.245.85 – 10.3.245.86	10.3.245.87
87	10.3.245.88/30	10.3.245.89 – 10.3.245.90	10.3.245.91
88	10.3.245.92/30	10.3.245.93 – 10.3.245.94	10.3.245.95
89	10.3.245.96/30	10.3.245.97 – 10.3.245.98	10.3.245.99
90	10.3.245.100/30	10.3.245.101 – 10.3.245.102	10.3.245.103
91	10.3.245.104/30	10.3.245.105 – 10.3.245.106	10.3.245.107
92	10.3.245.108/30	10.3.245.109 – 10.3.245.110	10.3.245.111
93	10.3.245.112/30	10.3.245.113 – 10.3.245.114	10.3.245.115
94	10.3.245.116/30	10.3.245.117 – 10.3.245.118	10.3.245.119
95	10.3.245.120/30	10.3.245.121 – 10.3.245.122	10.3.245.123
96	10.3.245.124/30	10.3.245.125 – 10.3.245.126	10.3.245.127
97	10.3.245.128/30	10.3.245.129 – 10.3.245.130	10.3.245.131
98	10.3.245.132/30	10.3.245.133 – 10.3.245.134	10.3.245.135
99	10.3.245.136/30	10.3.245.137 – 10.3.245.138	10.3.245.139
100	10.3.245.140/30	10.3.245.141 – 10.3.245.142	10.3.245.143
101	10.3.245.144/30	10.3.245.145 – 10.3.245.146	10.3.245.147
102	10.3.245.148/30	10.3.245.149 – 10.3.245.150	10.3.245.151
103	10.3.245.152/30	10.3.245.153 – 10.3.245.154	10.3.245.155
104	10.3.245.156/30	10.3.245.157 – 10.3.245.158	10.3.245.159
105	10.3.245.160/30	10.3.245.161 – 10.3.245.162	10.3.245.163
106	10.3.245.164/30	10.3.245.165 – 10.3.245.166	10.3.245.167
107	10.3.245.168/30	10.3.245.169 – 10.3.245.170	10.3.245.171
108	10.3.245.172/30	10.3.245.173 – 10.3.245.174	10.3.245.175
109	10.3.245.176/30	10.3.245.177 – 10.3.245.178	10.3.245.179
110	10.3.245.180/30	10.3.245.181 – 10.3.245.182	10.3.245.183
111	10.3.245.184/30	10.3.245.185 – 10.3.245.186	10.3.245.187
112	10.3.245.188/30	10.3.245.189 – 10.3.245.190	10.3.245.191
113	10.3.245.192/30	10.3.245.193 – 10.3.245.194	10.3.245.195
114	10.3.245.196/30	10.3.245.197 – 10.3.245.198	10.3.245.199
115	10.3.245.200/30	10.3.245.201 – 10.3.245.202	10.3.245.203
116	10.3.245.204/30	10.3.245.205 – 10.3.245.206	10.3.245.207
117	10.3.245.208/30	10.3.245.209 – 10.3.245.210	10.3.245.211
118	10.3.245.212/30	10.3.245.213 – 10.3.245.214	10.3.245.215
119	10.3.245.216/30	10.3.245.217 – 10.3.245.218	10.3.245.219
120	10.3.245.220/30	10.3.245.221 – 10.3.245.222	10.3.245.223
121	10.3.245.224/30	10.3.245.225 – 10.3.245.226	10.3.245.227
122	10.3.245.228/30	10.3.245.229 – 10.3.245.230	10.3.245.231
123	10.3.245.232/30	10.3.245.233 – 10.3.245.234	10.3.245.235
124	10.3.245.236/30	10.3.245.237 – 10.3.245.238	10.3.245.239
125	10.3.245.240/30	10.3.245.241 – 10.3.245.242	10.3.245.243
126	10.3.245.244/30	10.3.245.245 – 10.3.245.246	10.3.245.247
127	10.3.245.248/30	10.3.245.249 – 10.3.245.250	10.3.245.251
128	10.3.245.252/30	10.3.245.253 – 10.3.245.254	10.3.245.255

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 →