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)172.16.12.0/26

network172.16.12.0/26

broadcast172.16.12.63

first host172.16.12.1

last host172.16.12.62

subnet mask255.255.255.192

wildcard0.0.0.63

addresses64

usable hosts62

classB

ipcalc 172.16.12.0/26

address10101100.00010000.00001100.00000000

subnet mask11111111.11111111.11111111.11000000

network10101100.00010000.00001100.00000000

broadcast10101100.00010000.00001100.00111111

green = network part, grey = host part

hex0xac100c00

decimal2886732800

reverse dns0.12.16.172.in-addr.arpa

ipv4-mapped::ffff:ac10:c00

/26 split into /32 · 64 subnets

close ×

#	network	host range	broadcast
1	172.16.12.0/32	172.16.12.0 – 172.16.12.0	172.16.12.0
2	172.16.12.1/32	172.16.12.1 – 172.16.12.1	172.16.12.1
3	172.16.12.2/32	172.16.12.2 – 172.16.12.2	172.16.12.2
4	172.16.12.3/32	172.16.12.3 – 172.16.12.3	172.16.12.3
5	172.16.12.4/32	172.16.12.4 – 172.16.12.4	172.16.12.4
6	172.16.12.5/32	172.16.12.5 – 172.16.12.5	172.16.12.5
7	172.16.12.6/32	172.16.12.6 – 172.16.12.6	172.16.12.6
8	172.16.12.7/32	172.16.12.7 – 172.16.12.7	172.16.12.7
9	172.16.12.8/32	172.16.12.8 – 172.16.12.8	172.16.12.8
10	172.16.12.9/32	172.16.12.9 – 172.16.12.9	172.16.12.9
11	172.16.12.10/32	172.16.12.10 – 172.16.12.10	172.16.12.10
12	172.16.12.11/32	172.16.12.11 – 172.16.12.11	172.16.12.11
13	172.16.12.12/32	172.16.12.12 – 172.16.12.12	172.16.12.12
14	172.16.12.13/32	172.16.12.13 – 172.16.12.13	172.16.12.13
15	172.16.12.14/32	172.16.12.14 – 172.16.12.14	172.16.12.14
16	172.16.12.15/32	172.16.12.15 – 172.16.12.15	172.16.12.15
17	172.16.12.16/32	172.16.12.16 – 172.16.12.16	172.16.12.16
18	172.16.12.17/32	172.16.12.17 – 172.16.12.17	172.16.12.17
19	172.16.12.18/32	172.16.12.18 – 172.16.12.18	172.16.12.18
20	172.16.12.19/32	172.16.12.19 – 172.16.12.19	172.16.12.19
21	172.16.12.20/32	172.16.12.20 – 172.16.12.20	172.16.12.20
22	172.16.12.21/32	172.16.12.21 – 172.16.12.21	172.16.12.21
23	172.16.12.22/32	172.16.12.22 – 172.16.12.22	172.16.12.22
24	172.16.12.23/32	172.16.12.23 – 172.16.12.23	172.16.12.23
25	172.16.12.24/32	172.16.12.24 – 172.16.12.24	172.16.12.24
26	172.16.12.25/32	172.16.12.25 – 172.16.12.25	172.16.12.25
27	172.16.12.26/32	172.16.12.26 – 172.16.12.26	172.16.12.26
28	172.16.12.27/32	172.16.12.27 – 172.16.12.27	172.16.12.27
29	172.16.12.28/32	172.16.12.28 – 172.16.12.28	172.16.12.28
30	172.16.12.29/32	172.16.12.29 – 172.16.12.29	172.16.12.29
31	172.16.12.30/32	172.16.12.30 – 172.16.12.30	172.16.12.30
32	172.16.12.31/32	172.16.12.31 – 172.16.12.31	172.16.12.31
33	172.16.12.32/32	172.16.12.32 – 172.16.12.32	172.16.12.32
34	172.16.12.33/32	172.16.12.33 – 172.16.12.33	172.16.12.33
35	172.16.12.34/32	172.16.12.34 – 172.16.12.34	172.16.12.34
36	172.16.12.35/32	172.16.12.35 – 172.16.12.35	172.16.12.35
37	172.16.12.36/32	172.16.12.36 – 172.16.12.36	172.16.12.36
38	172.16.12.37/32	172.16.12.37 – 172.16.12.37	172.16.12.37
39	172.16.12.38/32	172.16.12.38 – 172.16.12.38	172.16.12.38
40	172.16.12.39/32	172.16.12.39 – 172.16.12.39	172.16.12.39
41	172.16.12.40/32	172.16.12.40 – 172.16.12.40	172.16.12.40
42	172.16.12.41/32	172.16.12.41 – 172.16.12.41	172.16.12.41
43	172.16.12.42/32	172.16.12.42 – 172.16.12.42	172.16.12.42
44	172.16.12.43/32	172.16.12.43 – 172.16.12.43	172.16.12.43
45	172.16.12.44/32	172.16.12.44 – 172.16.12.44	172.16.12.44
46	172.16.12.45/32	172.16.12.45 – 172.16.12.45	172.16.12.45
47	172.16.12.46/32	172.16.12.46 – 172.16.12.46	172.16.12.46
48	172.16.12.47/32	172.16.12.47 – 172.16.12.47	172.16.12.47
49	172.16.12.48/32	172.16.12.48 – 172.16.12.48	172.16.12.48
50	172.16.12.49/32	172.16.12.49 – 172.16.12.49	172.16.12.49
51	172.16.12.50/32	172.16.12.50 – 172.16.12.50	172.16.12.50
52	172.16.12.51/32	172.16.12.51 – 172.16.12.51	172.16.12.51
53	172.16.12.52/32	172.16.12.52 – 172.16.12.52	172.16.12.52
54	172.16.12.53/32	172.16.12.53 – 172.16.12.53	172.16.12.53
55	172.16.12.54/32	172.16.12.54 – 172.16.12.54	172.16.12.54
56	172.16.12.55/32	172.16.12.55 – 172.16.12.55	172.16.12.55
57	172.16.12.56/32	172.16.12.56 – 172.16.12.56	172.16.12.56
58	172.16.12.57/32	172.16.12.57 – 172.16.12.57	172.16.12.57
59	172.16.12.58/32	172.16.12.58 – 172.16.12.58	172.16.12.58
60	172.16.12.59/32	172.16.12.59 – 172.16.12.59	172.16.12.59
61	172.16.12.60/32	172.16.12.60 – 172.16.12.60	172.16.12.60
62	172.16.12.61/32	172.16.12.61 – 172.16.12.61	172.16.12.61
63	172.16.12.62/32	172.16.12.62 – 172.16.12.62	172.16.12.62
64	172.16.12.63/32	172.16.12.63 – 172.16.12.63	172.16.12.63

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 /26
/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	-
/24	255.255.255.0	256	254	-
/25	255.255.255.128	128	126	-
/26	255.255.255.192	64	62	1
/27	255.255.255.224	32	30	2 split →
/28	255.255.255.240	16	14	4 split →
/29	255.255.255.248	8	6	8 split →
/30	255.255.255.252	4	2	16 split →
/31	255.255.255.254	2	2	32 split →
/32	255.255.255.255	1	1	64 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 →