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)10.167.38.0/23

network10.167.38.0/23

broadcast10.167.39.255

first host10.167.38.1

last host10.167.39.254

subnet mask255.255.254.0

wildcard0.0.1.255

addresses512

usable hosts510

classA

ipcalc 10.167.38.0/23

address00001010.10100111.00100110.00000000

subnet mask11111111.11111111.11111110.00000000

network00001010.10100111.00100110.00000000

broadcast00001010.10100111.00100111.11111111

green = network part, grey = host part

hex0x0aa72600

decimal178726400

reverse dns0.38.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:2600

/23 split into /30 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.38.0/30	10.167.38.1 – 10.167.38.2	10.167.38.3
2	10.167.38.4/30	10.167.38.5 – 10.167.38.6	10.167.38.7
3	10.167.38.8/30	10.167.38.9 – 10.167.38.10	10.167.38.11
4	10.167.38.12/30	10.167.38.13 – 10.167.38.14	10.167.38.15
5	10.167.38.16/30	10.167.38.17 – 10.167.38.18	10.167.38.19
6	10.167.38.20/30	10.167.38.21 – 10.167.38.22	10.167.38.23
7	10.167.38.24/30	10.167.38.25 – 10.167.38.26	10.167.38.27
8	10.167.38.28/30	10.167.38.29 – 10.167.38.30	10.167.38.31
9	10.167.38.32/30	10.167.38.33 – 10.167.38.34	10.167.38.35
10	10.167.38.36/30	10.167.38.37 – 10.167.38.38	10.167.38.39
11	10.167.38.40/30	10.167.38.41 – 10.167.38.42	10.167.38.43
12	10.167.38.44/30	10.167.38.45 – 10.167.38.46	10.167.38.47
13	10.167.38.48/30	10.167.38.49 – 10.167.38.50	10.167.38.51
14	10.167.38.52/30	10.167.38.53 – 10.167.38.54	10.167.38.55
15	10.167.38.56/30	10.167.38.57 – 10.167.38.58	10.167.38.59
16	10.167.38.60/30	10.167.38.61 – 10.167.38.62	10.167.38.63
17	10.167.38.64/30	10.167.38.65 – 10.167.38.66	10.167.38.67
18	10.167.38.68/30	10.167.38.69 – 10.167.38.70	10.167.38.71
19	10.167.38.72/30	10.167.38.73 – 10.167.38.74	10.167.38.75
20	10.167.38.76/30	10.167.38.77 – 10.167.38.78	10.167.38.79
21	10.167.38.80/30	10.167.38.81 – 10.167.38.82	10.167.38.83
22	10.167.38.84/30	10.167.38.85 – 10.167.38.86	10.167.38.87
23	10.167.38.88/30	10.167.38.89 – 10.167.38.90	10.167.38.91
24	10.167.38.92/30	10.167.38.93 – 10.167.38.94	10.167.38.95
25	10.167.38.96/30	10.167.38.97 – 10.167.38.98	10.167.38.99
26	10.167.38.100/30	10.167.38.101 – 10.167.38.102	10.167.38.103
27	10.167.38.104/30	10.167.38.105 – 10.167.38.106	10.167.38.107
28	10.167.38.108/30	10.167.38.109 – 10.167.38.110	10.167.38.111
29	10.167.38.112/30	10.167.38.113 – 10.167.38.114	10.167.38.115
30	10.167.38.116/30	10.167.38.117 – 10.167.38.118	10.167.38.119
31	10.167.38.120/30	10.167.38.121 – 10.167.38.122	10.167.38.123
32	10.167.38.124/30	10.167.38.125 – 10.167.38.126	10.167.38.127
33	10.167.38.128/30	10.167.38.129 – 10.167.38.130	10.167.38.131
34	10.167.38.132/30	10.167.38.133 – 10.167.38.134	10.167.38.135
35	10.167.38.136/30	10.167.38.137 – 10.167.38.138	10.167.38.139
36	10.167.38.140/30	10.167.38.141 – 10.167.38.142	10.167.38.143
37	10.167.38.144/30	10.167.38.145 – 10.167.38.146	10.167.38.147
38	10.167.38.148/30	10.167.38.149 – 10.167.38.150	10.167.38.151
39	10.167.38.152/30	10.167.38.153 – 10.167.38.154	10.167.38.155
40	10.167.38.156/30	10.167.38.157 – 10.167.38.158	10.167.38.159
41	10.167.38.160/30	10.167.38.161 – 10.167.38.162	10.167.38.163
42	10.167.38.164/30	10.167.38.165 – 10.167.38.166	10.167.38.167
43	10.167.38.168/30	10.167.38.169 – 10.167.38.170	10.167.38.171
44	10.167.38.172/30	10.167.38.173 – 10.167.38.174	10.167.38.175
45	10.167.38.176/30	10.167.38.177 – 10.167.38.178	10.167.38.179
46	10.167.38.180/30	10.167.38.181 – 10.167.38.182	10.167.38.183
47	10.167.38.184/30	10.167.38.185 – 10.167.38.186	10.167.38.187
48	10.167.38.188/30	10.167.38.189 – 10.167.38.190	10.167.38.191
49	10.167.38.192/30	10.167.38.193 – 10.167.38.194	10.167.38.195
50	10.167.38.196/30	10.167.38.197 – 10.167.38.198	10.167.38.199
51	10.167.38.200/30	10.167.38.201 – 10.167.38.202	10.167.38.203
52	10.167.38.204/30	10.167.38.205 – 10.167.38.206	10.167.38.207
53	10.167.38.208/30	10.167.38.209 – 10.167.38.210	10.167.38.211
54	10.167.38.212/30	10.167.38.213 – 10.167.38.214	10.167.38.215
55	10.167.38.216/30	10.167.38.217 – 10.167.38.218	10.167.38.219
56	10.167.38.220/30	10.167.38.221 – 10.167.38.222	10.167.38.223
57	10.167.38.224/30	10.167.38.225 – 10.167.38.226	10.167.38.227
58	10.167.38.228/30	10.167.38.229 – 10.167.38.230	10.167.38.231
59	10.167.38.232/30	10.167.38.233 – 10.167.38.234	10.167.38.235
60	10.167.38.236/30	10.167.38.237 – 10.167.38.238	10.167.38.239
61	10.167.38.240/30	10.167.38.241 – 10.167.38.242	10.167.38.243
62	10.167.38.244/30	10.167.38.245 – 10.167.38.246	10.167.38.247
63	10.167.38.248/30	10.167.38.249 – 10.167.38.250	10.167.38.251
64	10.167.38.252/30	10.167.38.253 – 10.167.38.254	10.167.38.255
65	10.167.39.0/30	10.167.39.1 – 10.167.39.2	10.167.39.3
66	10.167.39.4/30	10.167.39.5 – 10.167.39.6	10.167.39.7
67	10.167.39.8/30	10.167.39.9 – 10.167.39.10	10.167.39.11
68	10.167.39.12/30	10.167.39.13 – 10.167.39.14	10.167.39.15
69	10.167.39.16/30	10.167.39.17 – 10.167.39.18	10.167.39.19
70	10.167.39.20/30	10.167.39.21 – 10.167.39.22	10.167.39.23
71	10.167.39.24/30	10.167.39.25 – 10.167.39.26	10.167.39.27
72	10.167.39.28/30	10.167.39.29 – 10.167.39.30	10.167.39.31
73	10.167.39.32/30	10.167.39.33 – 10.167.39.34	10.167.39.35
74	10.167.39.36/30	10.167.39.37 – 10.167.39.38	10.167.39.39
75	10.167.39.40/30	10.167.39.41 – 10.167.39.42	10.167.39.43
76	10.167.39.44/30	10.167.39.45 – 10.167.39.46	10.167.39.47
77	10.167.39.48/30	10.167.39.49 – 10.167.39.50	10.167.39.51
78	10.167.39.52/30	10.167.39.53 – 10.167.39.54	10.167.39.55
79	10.167.39.56/30	10.167.39.57 – 10.167.39.58	10.167.39.59
80	10.167.39.60/30	10.167.39.61 – 10.167.39.62	10.167.39.63
81	10.167.39.64/30	10.167.39.65 – 10.167.39.66	10.167.39.67
82	10.167.39.68/30	10.167.39.69 – 10.167.39.70	10.167.39.71
83	10.167.39.72/30	10.167.39.73 – 10.167.39.74	10.167.39.75
84	10.167.39.76/30	10.167.39.77 – 10.167.39.78	10.167.39.79
85	10.167.39.80/30	10.167.39.81 – 10.167.39.82	10.167.39.83
86	10.167.39.84/30	10.167.39.85 – 10.167.39.86	10.167.39.87
87	10.167.39.88/30	10.167.39.89 – 10.167.39.90	10.167.39.91
88	10.167.39.92/30	10.167.39.93 – 10.167.39.94	10.167.39.95
89	10.167.39.96/30	10.167.39.97 – 10.167.39.98	10.167.39.99
90	10.167.39.100/30	10.167.39.101 – 10.167.39.102	10.167.39.103
91	10.167.39.104/30	10.167.39.105 – 10.167.39.106	10.167.39.107
92	10.167.39.108/30	10.167.39.109 – 10.167.39.110	10.167.39.111
93	10.167.39.112/30	10.167.39.113 – 10.167.39.114	10.167.39.115
94	10.167.39.116/30	10.167.39.117 – 10.167.39.118	10.167.39.119
95	10.167.39.120/30	10.167.39.121 – 10.167.39.122	10.167.39.123
96	10.167.39.124/30	10.167.39.125 – 10.167.39.126	10.167.39.127
97	10.167.39.128/30	10.167.39.129 – 10.167.39.130	10.167.39.131
98	10.167.39.132/30	10.167.39.133 – 10.167.39.134	10.167.39.135
99	10.167.39.136/30	10.167.39.137 – 10.167.39.138	10.167.39.139
100	10.167.39.140/30	10.167.39.141 – 10.167.39.142	10.167.39.143
101	10.167.39.144/30	10.167.39.145 – 10.167.39.146	10.167.39.147
102	10.167.39.148/30	10.167.39.149 – 10.167.39.150	10.167.39.151
103	10.167.39.152/30	10.167.39.153 – 10.167.39.154	10.167.39.155
104	10.167.39.156/30	10.167.39.157 – 10.167.39.158	10.167.39.159
105	10.167.39.160/30	10.167.39.161 – 10.167.39.162	10.167.39.163
106	10.167.39.164/30	10.167.39.165 – 10.167.39.166	10.167.39.167
107	10.167.39.168/30	10.167.39.169 – 10.167.39.170	10.167.39.171
108	10.167.39.172/30	10.167.39.173 – 10.167.39.174	10.167.39.175
109	10.167.39.176/30	10.167.39.177 – 10.167.39.178	10.167.39.179
110	10.167.39.180/30	10.167.39.181 – 10.167.39.182	10.167.39.183
111	10.167.39.184/30	10.167.39.185 – 10.167.39.186	10.167.39.187
112	10.167.39.188/30	10.167.39.189 – 10.167.39.190	10.167.39.191
113	10.167.39.192/30	10.167.39.193 – 10.167.39.194	10.167.39.195
114	10.167.39.196/30	10.167.39.197 – 10.167.39.198	10.167.39.199
115	10.167.39.200/30	10.167.39.201 – 10.167.39.202	10.167.39.203
116	10.167.39.204/30	10.167.39.205 – 10.167.39.206	10.167.39.207
117	10.167.39.208/30	10.167.39.209 – 10.167.39.210	10.167.39.211
118	10.167.39.212/30	10.167.39.213 – 10.167.39.214	10.167.39.215
119	10.167.39.216/30	10.167.39.217 – 10.167.39.218	10.167.39.219
120	10.167.39.220/30	10.167.39.221 – 10.167.39.222	10.167.39.223
121	10.167.39.224/30	10.167.39.225 – 10.167.39.226	10.167.39.227
122	10.167.39.228/30	10.167.39.229 – 10.167.39.230	10.167.39.231
123	10.167.39.232/30	10.167.39.233 – 10.167.39.234	10.167.39.235
124	10.167.39.236/30	10.167.39.237 – 10.167.39.238	10.167.39.239
125	10.167.39.240/30	10.167.39.241 – 10.167.39.242	10.167.39.243
126	10.167.39.244/30	10.167.39.245 – 10.167.39.246	10.167.39.247
127	10.167.39.248/30	10.167.39.249 – 10.167.39.250	10.167.39.251
128	10.167.39.252/30	10.167.39.253 – 10.167.39.254	10.167.39.255

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 →