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)10.2.238.0/23

network10.2.238.0/23

broadcast10.2.239.255

first host10.2.238.1

last host10.2.239.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.2.238.0/23

address00001010.00000010.11101110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.00000010.11101110.00000000

broadcast00001010.00000010.11101111.11111111

green = network part, grey = host part

hex0x0a02ee00

decimal167964160

reverse dns0.238.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:ee00

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.238.0/30	10.2.238.1 – 10.2.238.2	10.2.238.3
2	10.2.238.4/30	10.2.238.5 – 10.2.238.6	10.2.238.7
3	10.2.238.8/30	10.2.238.9 – 10.2.238.10	10.2.238.11
4	10.2.238.12/30	10.2.238.13 – 10.2.238.14	10.2.238.15
5	10.2.238.16/30	10.2.238.17 – 10.2.238.18	10.2.238.19
6	10.2.238.20/30	10.2.238.21 – 10.2.238.22	10.2.238.23
7	10.2.238.24/30	10.2.238.25 – 10.2.238.26	10.2.238.27
8	10.2.238.28/30	10.2.238.29 – 10.2.238.30	10.2.238.31
9	10.2.238.32/30	10.2.238.33 – 10.2.238.34	10.2.238.35
10	10.2.238.36/30	10.2.238.37 – 10.2.238.38	10.2.238.39
11	10.2.238.40/30	10.2.238.41 – 10.2.238.42	10.2.238.43
12	10.2.238.44/30	10.2.238.45 – 10.2.238.46	10.2.238.47
13	10.2.238.48/30	10.2.238.49 – 10.2.238.50	10.2.238.51
14	10.2.238.52/30	10.2.238.53 – 10.2.238.54	10.2.238.55
15	10.2.238.56/30	10.2.238.57 – 10.2.238.58	10.2.238.59
16	10.2.238.60/30	10.2.238.61 – 10.2.238.62	10.2.238.63
17	10.2.238.64/30	10.2.238.65 – 10.2.238.66	10.2.238.67
18	10.2.238.68/30	10.2.238.69 – 10.2.238.70	10.2.238.71
19	10.2.238.72/30	10.2.238.73 – 10.2.238.74	10.2.238.75
20	10.2.238.76/30	10.2.238.77 – 10.2.238.78	10.2.238.79
21	10.2.238.80/30	10.2.238.81 – 10.2.238.82	10.2.238.83
22	10.2.238.84/30	10.2.238.85 – 10.2.238.86	10.2.238.87
23	10.2.238.88/30	10.2.238.89 – 10.2.238.90	10.2.238.91
24	10.2.238.92/30	10.2.238.93 – 10.2.238.94	10.2.238.95
25	10.2.238.96/30	10.2.238.97 – 10.2.238.98	10.2.238.99
26	10.2.238.100/30	10.2.238.101 – 10.2.238.102	10.2.238.103
27	10.2.238.104/30	10.2.238.105 – 10.2.238.106	10.2.238.107
28	10.2.238.108/30	10.2.238.109 – 10.2.238.110	10.2.238.111
29	10.2.238.112/30	10.2.238.113 – 10.2.238.114	10.2.238.115
30	10.2.238.116/30	10.2.238.117 – 10.2.238.118	10.2.238.119
31	10.2.238.120/30	10.2.238.121 – 10.2.238.122	10.2.238.123
32	10.2.238.124/30	10.2.238.125 – 10.2.238.126	10.2.238.127
33	10.2.238.128/30	10.2.238.129 – 10.2.238.130	10.2.238.131
34	10.2.238.132/30	10.2.238.133 – 10.2.238.134	10.2.238.135
35	10.2.238.136/30	10.2.238.137 – 10.2.238.138	10.2.238.139
36	10.2.238.140/30	10.2.238.141 – 10.2.238.142	10.2.238.143
37	10.2.238.144/30	10.2.238.145 – 10.2.238.146	10.2.238.147
38	10.2.238.148/30	10.2.238.149 – 10.2.238.150	10.2.238.151
39	10.2.238.152/30	10.2.238.153 – 10.2.238.154	10.2.238.155
40	10.2.238.156/30	10.2.238.157 – 10.2.238.158	10.2.238.159
41	10.2.238.160/30	10.2.238.161 – 10.2.238.162	10.2.238.163
42	10.2.238.164/30	10.2.238.165 – 10.2.238.166	10.2.238.167
43	10.2.238.168/30	10.2.238.169 – 10.2.238.170	10.2.238.171
44	10.2.238.172/30	10.2.238.173 – 10.2.238.174	10.2.238.175
45	10.2.238.176/30	10.2.238.177 – 10.2.238.178	10.2.238.179
46	10.2.238.180/30	10.2.238.181 – 10.2.238.182	10.2.238.183
47	10.2.238.184/30	10.2.238.185 – 10.2.238.186	10.2.238.187
48	10.2.238.188/30	10.2.238.189 – 10.2.238.190	10.2.238.191
49	10.2.238.192/30	10.2.238.193 – 10.2.238.194	10.2.238.195
50	10.2.238.196/30	10.2.238.197 – 10.2.238.198	10.2.238.199
51	10.2.238.200/30	10.2.238.201 – 10.2.238.202	10.2.238.203
52	10.2.238.204/30	10.2.238.205 – 10.2.238.206	10.2.238.207
53	10.2.238.208/30	10.2.238.209 – 10.2.238.210	10.2.238.211
54	10.2.238.212/30	10.2.238.213 – 10.2.238.214	10.2.238.215
55	10.2.238.216/30	10.2.238.217 – 10.2.238.218	10.2.238.219
56	10.2.238.220/30	10.2.238.221 – 10.2.238.222	10.2.238.223
57	10.2.238.224/30	10.2.238.225 – 10.2.238.226	10.2.238.227
58	10.2.238.228/30	10.2.238.229 – 10.2.238.230	10.2.238.231
59	10.2.238.232/30	10.2.238.233 – 10.2.238.234	10.2.238.235
60	10.2.238.236/30	10.2.238.237 – 10.2.238.238	10.2.238.239
61	10.2.238.240/30	10.2.238.241 – 10.2.238.242	10.2.238.243
62	10.2.238.244/30	10.2.238.245 – 10.2.238.246	10.2.238.247
63	10.2.238.248/30	10.2.238.249 – 10.2.238.250	10.2.238.251
64	10.2.238.252/30	10.2.238.253 – 10.2.238.254	10.2.238.255
65	10.2.239.0/30	10.2.239.1 – 10.2.239.2	10.2.239.3
66	10.2.239.4/30	10.2.239.5 – 10.2.239.6	10.2.239.7
67	10.2.239.8/30	10.2.239.9 – 10.2.239.10	10.2.239.11
68	10.2.239.12/30	10.2.239.13 – 10.2.239.14	10.2.239.15
69	10.2.239.16/30	10.2.239.17 – 10.2.239.18	10.2.239.19
70	10.2.239.20/30	10.2.239.21 – 10.2.239.22	10.2.239.23
71	10.2.239.24/30	10.2.239.25 – 10.2.239.26	10.2.239.27
72	10.2.239.28/30	10.2.239.29 – 10.2.239.30	10.2.239.31
73	10.2.239.32/30	10.2.239.33 – 10.2.239.34	10.2.239.35
74	10.2.239.36/30	10.2.239.37 – 10.2.239.38	10.2.239.39
75	10.2.239.40/30	10.2.239.41 – 10.2.239.42	10.2.239.43
76	10.2.239.44/30	10.2.239.45 – 10.2.239.46	10.2.239.47
77	10.2.239.48/30	10.2.239.49 – 10.2.239.50	10.2.239.51
78	10.2.239.52/30	10.2.239.53 – 10.2.239.54	10.2.239.55
79	10.2.239.56/30	10.2.239.57 – 10.2.239.58	10.2.239.59
80	10.2.239.60/30	10.2.239.61 – 10.2.239.62	10.2.239.63
81	10.2.239.64/30	10.2.239.65 – 10.2.239.66	10.2.239.67
82	10.2.239.68/30	10.2.239.69 – 10.2.239.70	10.2.239.71
83	10.2.239.72/30	10.2.239.73 – 10.2.239.74	10.2.239.75
84	10.2.239.76/30	10.2.239.77 – 10.2.239.78	10.2.239.79
85	10.2.239.80/30	10.2.239.81 – 10.2.239.82	10.2.239.83
86	10.2.239.84/30	10.2.239.85 – 10.2.239.86	10.2.239.87
87	10.2.239.88/30	10.2.239.89 – 10.2.239.90	10.2.239.91
88	10.2.239.92/30	10.2.239.93 – 10.2.239.94	10.2.239.95
89	10.2.239.96/30	10.2.239.97 – 10.2.239.98	10.2.239.99
90	10.2.239.100/30	10.2.239.101 – 10.2.239.102	10.2.239.103
91	10.2.239.104/30	10.2.239.105 – 10.2.239.106	10.2.239.107
92	10.2.239.108/30	10.2.239.109 – 10.2.239.110	10.2.239.111
93	10.2.239.112/30	10.2.239.113 – 10.2.239.114	10.2.239.115
94	10.2.239.116/30	10.2.239.117 – 10.2.239.118	10.2.239.119
95	10.2.239.120/30	10.2.239.121 – 10.2.239.122	10.2.239.123
96	10.2.239.124/30	10.2.239.125 – 10.2.239.126	10.2.239.127
97	10.2.239.128/30	10.2.239.129 – 10.2.239.130	10.2.239.131
98	10.2.239.132/30	10.2.239.133 – 10.2.239.134	10.2.239.135
99	10.2.239.136/30	10.2.239.137 – 10.2.239.138	10.2.239.139
100	10.2.239.140/30	10.2.239.141 – 10.2.239.142	10.2.239.143
101	10.2.239.144/30	10.2.239.145 – 10.2.239.146	10.2.239.147
102	10.2.239.148/30	10.2.239.149 – 10.2.239.150	10.2.239.151
103	10.2.239.152/30	10.2.239.153 – 10.2.239.154	10.2.239.155
104	10.2.239.156/30	10.2.239.157 – 10.2.239.158	10.2.239.159
105	10.2.239.160/30	10.2.239.161 – 10.2.239.162	10.2.239.163
106	10.2.239.164/30	10.2.239.165 – 10.2.239.166	10.2.239.167
107	10.2.239.168/30	10.2.239.169 – 10.2.239.170	10.2.239.171
108	10.2.239.172/30	10.2.239.173 – 10.2.239.174	10.2.239.175
109	10.2.239.176/30	10.2.239.177 – 10.2.239.178	10.2.239.179
110	10.2.239.180/30	10.2.239.181 – 10.2.239.182	10.2.239.183
111	10.2.239.184/30	10.2.239.185 – 10.2.239.186	10.2.239.187
112	10.2.239.188/30	10.2.239.189 – 10.2.239.190	10.2.239.191
113	10.2.239.192/30	10.2.239.193 – 10.2.239.194	10.2.239.195
114	10.2.239.196/30	10.2.239.197 – 10.2.239.198	10.2.239.199
115	10.2.239.200/30	10.2.239.201 – 10.2.239.202	10.2.239.203
116	10.2.239.204/30	10.2.239.205 – 10.2.239.206	10.2.239.207
117	10.2.239.208/30	10.2.239.209 – 10.2.239.210	10.2.239.211
118	10.2.239.212/30	10.2.239.213 – 10.2.239.214	10.2.239.215
119	10.2.239.216/30	10.2.239.217 – 10.2.239.218	10.2.239.219
120	10.2.239.220/30	10.2.239.221 – 10.2.239.222	10.2.239.223
121	10.2.239.224/30	10.2.239.225 – 10.2.239.226	10.2.239.227
122	10.2.239.228/30	10.2.239.229 – 10.2.239.230	10.2.239.231
123	10.2.239.232/30	10.2.239.233 – 10.2.239.234	10.2.239.235
124	10.2.239.236/30	10.2.239.237 – 10.2.239.238	10.2.239.239
125	10.2.239.240/30	10.2.239.241 – 10.2.239.242	10.2.239.243
126	10.2.239.244/30	10.2.239.245 – 10.2.239.246	10.2.239.247
127	10.2.239.248/30	10.2.239.249 – 10.2.239.250	10.2.239.251
128	10.2.239.252/30	10.2.239.253 – 10.2.239.254	10.2.239.255

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 →