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)10.38.192.0/18

network10.38.192.0/18

broadcast10.38.255.255

first host10.38.192.1

last host10.38.255.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.38.192.0/18

address00001010.00100110.11000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00100110.11000000.00000000

broadcast00001010.00100110.11111111.11111111

green = network part, grey = host part

hex0x0a26c000

decimal170311680

reverse dns0.192.38.10.in-addr.arpa

ipv4-mapped::ffff:a26:c000

/18 split into /25 · 128 subnets

close ×

#	network	host range	broadcast
1	10.38.192.0/25	10.38.192.1 – 10.38.192.126	10.38.192.127
2	10.38.192.128/25	10.38.192.129 – 10.38.192.254	10.38.192.255
3	10.38.193.0/25	10.38.193.1 – 10.38.193.126	10.38.193.127
4	10.38.193.128/25	10.38.193.129 – 10.38.193.254	10.38.193.255
5	10.38.194.0/25	10.38.194.1 – 10.38.194.126	10.38.194.127
6	10.38.194.128/25	10.38.194.129 – 10.38.194.254	10.38.194.255
7	10.38.195.0/25	10.38.195.1 – 10.38.195.126	10.38.195.127
8	10.38.195.128/25	10.38.195.129 – 10.38.195.254	10.38.195.255
9	10.38.196.0/25	10.38.196.1 – 10.38.196.126	10.38.196.127
10	10.38.196.128/25	10.38.196.129 – 10.38.196.254	10.38.196.255
11	10.38.197.0/25	10.38.197.1 – 10.38.197.126	10.38.197.127
12	10.38.197.128/25	10.38.197.129 – 10.38.197.254	10.38.197.255
13	10.38.198.0/25	10.38.198.1 – 10.38.198.126	10.38.198.127
14	10.38.198.128/25	10.38.198.129 – 10.38.198.254	10.38.198.255
15	10.38.199.0/25	10.38.199.1 – 10.38.199.126	10.38.199.127
16	10.38.199.128/25	10.38.199.129 – 10.38.199.254	10.38.199.255
17	10.38.200.0/25	10.38.200.1 – 10.38.200.126	10.38.200.127
18	10.38.200.128/25	10.38.200.129 – 10.38.200.254	10.38.200.255
19	10.38.201.0/25	10.38.201.1 – 10.38.201.126	10.38.201.127
20	10.38.201.128/25	10.38.201.129 – 10.38.201.254	10.38.201.255
21	10.38.202.0/25	10.38.202.1 – 10.38.202.126	10.38.202.127
22	10.38.202.128/25	10.38.202.129 – 10.38.202.254	10.38.202.255
23	10.38.203.0/25	10.38.203.1 – 10.38.203.126	10.38.203.127
24	10.38.203.128/25	10.38.203.129 – 10.38.203.254	10.38.203.255
25	10.38.204.0/25	10.38.204.1 – 10.38.204.126	10.38.204.127
26	10.38.204.128/25	10.38.204.129 – 10.38.204.254	10.38.204.255
27	10.38.205.0/25	10.38.205.1 – 10.38.205.126	10.38.205.127
28	10.38.205.128/25	10.38.205.129 – 10.38.205.254	10.38.205.255
29	10.38.206.0/25	10.38.206.1 – 10.38.206.126	10.38.206.127
30	10.38.206.128/25	10.38.206.129 – 10.38.206.254	10.38.206.255
31	10.38.207.0/25	10.38.207.1 – 10.38.207.126	10.38.207.127
32	10.38.207.128/25	10.38.207.129 – 10.38.207.254	10.38.207.255
33	10.38.208.0/25	10.38.208.1 – 10.38.208.126	10.38.208.127
34	10.38.208.128/25	10.38.208.129 – 10.38.208.254	10.38.208.255
35	10.38.209.0/25	10.38.209.1 – 10.38.209.126	10.38.209.127
36	10.38.209.128/25	10.38.209.129 – 10.38.209.254	10.38.209.255
37	10.38.210.0/25	10.38.210.1 – 10.38.210.126	10.38.210.127
38	10.38.210.128/25	10.38.210.129 – 10.38.210.254	10.38.210.255
39	10.38.211.0/25	10.38.211.1 – 10.38.211.126	10.38.211.127
40	10.38.211.128/25	10.38.211.129 – 10.38.211.254	10.38.211.255
41	10.38.212.0/25	10.38.212.1 – 10.38.212.126	10.38.212.127
42	10.38.212.128/25	10.38.212.129 – 10.38.212.254	10.38.212.255
43	10.38.213.0/25	10.38.213.1 – 10.38.213.126	10.38.213.127
44	10.38.213.128/25	10.38.213.129 – 10.38.213.254	10.38.213.255
45	10.38.214.0/25	10.38.214.1 – 10.38.214.126	10.38.214.127
46	10.38.214.128/25	10.38.214.129 – 10.38.214.254	10.38.214.255
47	10.38.215.0/25	10.38.215.1 – 10.38.215.126	10.38.215.127
48	10.38.215.128/25	10.38.215.129 – 10.38.215.254	10.38.215.255
49	10.38.216.0/25	10.38.216.1 – 10.38.216.126	10.38.216.127
50	10.38.216.128/25	10.38.216.129 – 10.38.216.254	10.38.216.255
51	10.38.217.0/25	10.38.217.1 – 10.38.217.126	10.38.217.127
52	10.38.217.128/25	10.38.217.129 – 10.38.217.254	10.38.217.255
53	10.38.218.0/25	10.38.218.1 – 10.38.218.126	10.38.218.127
54	10.38.218.128/25	10.38.218.129 – 10.38.218.254	10.38.218.255
55	10.38.219.0/25	10.38.219.1 – 10.38.219.126	10.38.219.127
56	10.38.219.128/25	10.38.219.129 – 10.38.219.254	10.38.219.255
57	10.38.220.0/25	10.38.220.1 – 10.38.220.126	10.38.220.127
58	10.38.220.128/25	10.38.220.129 – 10.38.220.254	10.38.220.255
59	10.38.221.0/25	10.38.221.1 – 10.38.221.126	10.38.221.127
60	10.38.221.128/25	10.38.221.129 – 10.38.221.254	10.38.221.255
61	10.38.222.0/25	10.38.222.1 – 10.38.222.126	10.38.222.127
62	10.38.222.128/25	10.38.222.129 – 10.38.222.254	10.38.222.255
63	10.38.223.0/25	10.38.223.1 – 10.38.223.126	10.38.223.127
64	10.38.223.128/25	10.38.223.129 – 10.38.223.254	10.38.223.255
65	10.38.224.0/25	10.38.224.1 – 10.38.224.126	10.38.224.127
66	10.38.224.128/25	10.38.224.129 – 10.38.224.254	10.38.224.255
67	10.38.225.0/25	10.38.225.1 – 10.38.225.126	10.38.225.127
68	10.38.225.128/25	10.38.225.129 – 10.38.225.254	10.38.225.255
69	10.38.226.0/25	10.38.226.1 – 10.38.226.126	10.38.226.127
70	10.38.226.128/25	10.38.226.129 – 10.38.226.254	10.38.226.255
71	10.38.227.0/25	10.38.227.1 – 10.38.227.126	10.38.227.127
72	10.38.227.128/25	10.38.227.129 – 10.38.227.254	10.38.227.255
73	10.38.228.0/25	10.38.228.1 – 10.38.228.126	10.38.228.127
74	10.38.228.128/25	10.38.228.129 – 10.38.228.254	10.38.228.255
75	10.38.229.0/25	10.38.229.1 – 10.38.229.126	10.38.229.127
76	10.38.229.128/25	10.38.229.129 – 10.38.229.254	10.38.229.255
77	10.38.230.0/25	10.38.230.1 – 10.38.230.126	10.38.230.127
78	10.38.230.128/25	10.38.230.129 – 10.38.230.254	10.38.230.255
79	10.38.231.0/25	10.38.231.1 – 10.38.231.126	10.38.231.127
80	10.38.231.128/25	10.38.231.129 – 10.38.231.254	10.38.231.255
81	10.38.232.0/25	10.38.232.1 – 10.38.232.126	10.38.232.127
82	10.38.232.128/25	10.38.232.129 – 10.38.232.254	10.38.232.255
83	10.38.233.0/25	10.38.233.1 – 10.38.233.126	10.38.233.127
84	10.38.233.128/25	10.38.233.129 – 10.38.233.254	10.38.233.255
85	10.38.234.0/25	10.38.234.1 – 10.38.234.126	10.38.234.127
86	10.38.234.128/25	10.38.234.129 – 10.38.234.254	10.38.234.255
87	10.38.235.0/25	10.38.235.1 – 10.38.235.126	10.38.235.127
88	10.38.235.128/25	10.38.235.129 – 10.38.235.254	10.38.235.255
89	10.38.236.0/25	10.38.236.1 – 10.38.236.126	10.38.236.127
90	10.38.236.128/25	10.38.236.129 – 10.38.236.254	10.38.236.255
91	10.38.237.0/25	10.38.237.1 – 10.38.237.126	10.38.237.127
92	10.38.237.128/25	10.38.237.129 – 10.38.237.254	10.38.237.255
93	10.38.238.0/25	10.38.238.1 – 10.38.238.126	10.38.238.127
94	10.38.238.128/25	10.38.238.129 – 10.38.238.254	10.38.238.255
95	10.38.239.0/25	10.38.239.1 – 10.38.239.126	10.38.239.127
96	10.38.239.128/25	10.38.239.129 – 10.38.239.254	10.38.239.255
97	10.38.240.0/25	10.38.240.1 – 10.38.240.126	10.38.240.127
98	10.38.240.128/25	10.38.240.129 – 10.38.240.254	10.38.240.255
99	10.38.241.0/25	10.38.241.1 – 10.38.241.126	10.38.241.127
100	10.38.241.128/25	10.38.241.129 – 10.38.241.254	10.38.241.255
101	10.38.242.0/25	10.38.242.1 – 10.38.242.126	10.38.242.127
102	10.38.242.128/25	10.38.242.129 – 10.38.242.254	10.38.242.255
103	10.38.243.0/25	10.38.243.1 – 10.38.243.126	10.38.243.127
104	10.38.243.128/25	10.38.243.129 – 10.38.243.254	10.38.243.255
105	10.38.244.0/25	10.38.244.1 – 10.38.244.126	10.38.244.127
106	10.38.244.128/25	10.38.244.129 – 10.38.244.254	10.38.244.255
107	10.38.245.0/25	10.38.245.1 – 10.38.245.126	10.38.245.127
108	10.38.245.128/25	10.38.245.129 – 10.38.245.254	10.38.245.255
109	10.38.246.0/25	10.38.246.1 – 10.38.246.126	10.38.246.127
110	10.38.246.128/25	10.38.246.129 – 10.38.246.254	10.38.246.255
111	10.38.247.0/25	10.38.247.1 – 10.38.247.126	10.38.247.127
112	10.38.247.128/25	10.38.247.129 – 10.38.247.254	10.38.247.255
113	10.38.248.0/25	10.38.248.1 – 10.38.248.126	10.38.248.127
114	10.38.248.128/25	10.38.248.129 – 10.38.248.254	10.38.248.255
115	10.38.249.0/25	10.38.249.1 – 10.38.249.126	10.38.249.127
116	10.38.249.128/25	10.38.249.129 – 10.38.249.254	10.38.249.255
117	10.38.250.0/25	10.38.250.1 – 10.38.250.126	10.38.250.127
118	10.38.250.128/25	10.38.250.129 – 10.38.250.254	10.38.250.255
119	10.38.251.0/25	10.38.251.1 – 10.38.251.126	10.38.251.127
120	10.38.251.128/25	10.38.251.129 – 10.38.251.254	10.38.251.255
121	10.38.252.0/25	10.38.252.1 – 10.38.252.126	10.38.252.127
122	10.38.252.128/25	10.38.252.129 – 10.38.252.254	10.38.252.255
123	10.38.253.0/25	10.38.253.1 – 10.38.253.126	10.38.253.127
124	10.38.253.128/25	10.38.253.129 – 10.38.253.254	10.38.253.255
125	10.38.254.0/25	10.38.254.1 – 10.38.254.126	10.38.254.127
126	10.38.254.128/25	10.38.254.129 – 10.38.254.254	10.38.254.255
127	10.38.255.0/25	10.38.255.1 – 10.38.255.126	10.38.255.127
128	10.38.255.128/25	10.38.255.129 – 10.38.255.254	10.38.255.255

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 /18
/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	1
/19	255.255.224.0	8,192	8,190	2 split →
/20	255.255.240.0	4,096	4,094	4 split →
/21	255.255.248.0	2,048	2,046	8 split →
/22	255.255.252.0	1,024	1,022	16 split →
/23	255.255.254.0	512	510	32 split →
/24	255.255.255.0	256	254	64 split →
/25	255.255.255.128	128	126	128 split →
/26	255.255.255.192	64	62	256 split →
/27	255.255.255.224	32	30	512 split →
/28	255.255.255.240	16	14	1,024 split →
/29	255.255.255.248	8	6	2,048 split →
/30	255.255.255.252	4	2	4,096 split →
/31	255.255.255.254	2	2	8,192 split →
/32	255.255.255.255	1	1	16,384 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 →