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)10.28.64.0/18

network10.28.64.0/18

broadcast10.28.127.255

first host10.28.64.1

last host10.28.127.254

subnet mask255.255.192.0

wildcard0.0.63.255

addresses16,384

usable hosts16,382

classA

ipcalc 10.28.64.0/18

address00001010.00011100.01000000.00000000

subnet mask11111111.11111111.11000000.00000000

network00001010.00011100.01000000.00000000

broadcast00001010.00011100.01111111.11111111

green = network part, grey = host part

hex0x0a1c4000

decimal169623552

reverse dns0.64.28.10.in-addr.arpa

ipv4-mapped::ffff:a1c:4000

/18 split into /24 · 64 subnets

close ×

#	network	host range	broadcast
1	10.28.64.0/24	10.28.64.1 – 10.28.64.254	10.28.64.255
2	10.28.65.0/24	10.28.65.1 – 10.28.65.254	10.28.65.255
3	10.28.66.0/24	10.28.66.1 – 10.28.66.254	10.28.66.255
4	10.28.67.0/24	10.28.67.1 – 10.28.67.254	10.28.67.255
5	10.28.68.0/24	10.28.68.1 – 10.28.68.254	10.28.68.255
6	10.28.69.0/24	10.28.69.1 – 10.28.69.254	10.28.69.255
7	10.28.70.0/24	10.28.70.1 – 10.28.70.254	10.28.70.255
8	10.28.71.0/24	10.28.71.1 – 10.28.71.254	10.28.71.255
9	10.28.72.0/24	10.28.72.1 – 10.28.72.254	10.28.72.255
10	10.28.73.0/24	10.28.73.1 – 10.28.73.254	10.28.73.255
11	10.28.74.0/24	10.28.74.1 – 10.28.74.254	10.28.74.255
12	10.28.75.0/24	10.28.75.1 – 10.28.75.254	10.28.75.255
13	10.28.76.0/24	10.28.76.1 – 10.28.76.254	10.28.76.255
14	10.28.77.0/24	10.28.77.1 – 10.28.77.254	10.28.77.255
15	10.28.78.0/24	10.28.78.1 – 10.28.78.254	10.28.78.255
16	10.28.79.0/24	10.28.79.1 – 10.28.79.254	10.28.79.255
17	10.28.80.0/24	10.28.80.1 – 10.28.80.254	10.28.80.255
18	10.28.81.0/24	10.28.81.1 – 10.28.81.254	10.28.81.255
19	10.28.82.0/24	10.28.82.1 – 10.28.82.254	10.28.82.255
20	10.28.83.0/24	10.28.83.1 – 10.28.83.254	10.28.83.255
21	10.28.84.0/24	10.28.84.1 – 10.28.84.254	10.28.84.255
22	10.28.85.0/24	10.28.85.1 – 10.28.85.254	10.28.85.255
23	10.28.86.0/24	10.28.86.1 – 10.28.86.254	10.28.86.255
24	10.28.87.0/24	10.28.87.1 – 10.28.87.254	10.28.87.255
25	10.28.88.0/24	10.28.88.1 – 10.28.88.254	10.28.88.255
26	10.28.89.0/24	10.28.89.1 – 10.28.89.254	10.28.89.255
27	10.28.90.0/24	10.28.90.1 – 10.28.90.254	10.28.90.255
28	10.28.91.0/24	10.28.91.1 – 10.28.91.254	10.28.91.255
29	10.28.92.0/24	10.28.92.1 – 10.28.92.254	10.28.92.255
30	10.28.93.0/24	10.28.93.1 – 10.28.93.254	10.28.93.255
31	10.28.94.0/24	10.28.94.1 – 10.28.94.254	10.28.94.255
32	10.28.95.0/24	10.28.95.1 – 10.28.95.254	10.28.95.255
33	10.28.96.0/24	10.28.96.1 – 10.28.96.254	10.28.96.255
34	10.28.97.0/24	10.28.97.1 – 10.28.97.254	10.28.97.255
35	10.28.98.0/24	10.28.98.1 – 10.28.98.254	10.28.98.255
36	10.28.99.0/24	10.28.99.1 – 10.28.99.254	10.28.99.255
37	10.28.100.0/24	10.28.100.1 – 10.28.100.254	10.28.100.255
38	10.28.101.0/24	10.28.101.1 – 10.28.101.254	10.28.101.255
39	10.28.102.0/24	10.28.102.1 – 10.28.102.254	10.28.102.255
40	10.28.103.0/24	10.28.103.1 – 10.28.103.254	10.28.103.255
41	10.28.104.0/24	10.28.104.1 – 10.28.104.254	10.28.104.255
42	10.28.105.0/24	10.28.105.1 – 10.28.105.254	10.28.105.255
43	10.28.106.0/24	10.28.106.1 – 10.28.106.254	10.28.106.255
44	10.28.107.0/24	10.28.107.1 – 10.28.107.254	10.28.107.255
45	10.28.108.0/24	10.28.108.1 – 10.28.108.254	10.28.108.255
46	10.28.109.0/24	10.28.109.1 – 10.28.109.254	10.28.109.255
47	10.28.110.0/24	10.28.110.1 – 10.28.110.254	10.28.110.255
48	10.28.111.0/24	10.28.111.1 – 10.28.111.254	10.28.111.255
49	10.28.112.0/24	10.28.112.1 – 10.28.112.254	10.28.112.255
50	10.28.113.0/24	10.28.113.1 – 10.28.113.254	10.28.113.255
51	10.28.114.0/24	10.28.114.1 – 10.28.114.254	10.28.114.255
52	10.28.115.0/24	10.28.115.1 – 10.28.115.254	10.28.115.255
53	10.28.116.0/24	10.28.116.1 – 10.28.116.254	10.28.116.255
54	10.28.117.0/24	10.28.117.1 – 10.28.117.254	10.28.117.255
55	10.28.118.0/24	10.28.118.1 – 10.28.118.254	10.28.118.255
56	10.28.119.0/24	10.28.119.1 – 10.28.119.254	10.28.119.255
57	10.28.120.0/24	10.28.120.1 – 10.28.120.254	10.28.120.255
58	10.28.121.0/24	10.28.121.1 – 10.28.121.254	10.28.121.255
59	10.28.122.0/24	10.28.122.1 – 10.28.122.254	10.28.122.255
60	10.28.123.0/24	10.28.123.1 – 10.28.123.254	10.28.123.255
61	10.28.124.0/24	10.28.124.1 – 10.28.124.254	10.28.124.255
62	10.28.125.0/24	10.28.125.1 – 10.28.125.254	10.28.125.255
63	10.28.126.0/24	10.28.126.1 – 10.28.126.254	10.28.126.255
64	10.28.127.0/24	10.28.127.1 – 10.28.127.254	10.28.127.255

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 →