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)10.4.52.0/25

network10.4.52.0/25

broadcast10.4.52.127

first host10.4.52.1

last host10.4.52.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.4.52.0/25

address00001010.00000100.00110100.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000100.00110100.00000000

broadcast00001010.00000100.00110100.01111111

green = network part, grey = host part

hex0x0a043400

decimal168047616

reverse dns0.52.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:3400

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.4.52.0/31	10.4.52.0 – 10.4.52.1	10.4.52.1
2	10.4.52.2/31	10.4.52.2 – 10.4.52.3	10.4.52.3
3	10.4.52.4/31	10.4.52.4 – 10.4.52.5	10.4.52.5
4	10.4.52.6/31	10.4.52.6 – 10.4.52.7	10.4.52.7
5	10.4.52.8/31	10.4.52.8 – 10.4.52.9	10.4.52.9
6	10.4.52.10/31	10.4.52.10 – 10.4.52.11	10.4.52.11
7	10.4.52.12/31	10.4.52.12 – 10.4.52.13	10.4.52.13
8	10.4.52.14/31	10.4.52.14 – 10.4.52.15	10.4.52.15
9	10.4.52.16/31	10.4.52.16 – 10.4.52.17	10.4.52.17
10	10.4.52.18/31	10.4.52.18 – 10.4.52.19	10.4.52.19
11	10.4.52.20/31	10.4.52.20 – 10.4.52.21	10.4.52.21
12	10.4.52.22/31	10.4.52.22 – 10.4.52.23	10.4.52.23
13	10.4.52.24/31	10.4.52.24 – 10.4.52.25	10.4.52.25
14	10.4.52.26/31	10.4.52.26 – 10.4.52.27	10.4.52.27
15	10.4.52.28/31	10.4.52.28 – 10.4.52.29	10.4.52.29
16	10.4.52.30/31	10.4.52.30 – 10.4.52.31	10.4.52.31
17	10.4.52.32/31	10.4.52.32 – 10.4.52.33	10.4.52.33
18	10.4.52.34/31	10.4.52.34 – 10.4.52.35	10.4.52.35
19	10.4.52.36/31	10.4.52.36 – 10.4.52.37	10.4.52.37
20	10.4.52.38/31	10.4.52.38 – 10.4.52.39	10.4.52.39
21	10.4.52.40/31	10.4.52.40 – 10.4.52.41	10.4.52.41
22	10.4.52.42/31	10.4.52.42 – 10.4.52.43	10.4.52.43
23	10.4.52.44/31	10.4.52.44 – 10.4.52.45	10.4.52.45
24	10.4.52.46/31	10.4.52.46 – 10.4.52.47	10.4.52.47
25	10.4.52.48/31	10.4.52.48 – 10.4.52.49	10.4.52.49
26	10.4.52.50/31	10.4.52.50 – 10.4.52.51	10.4.52.51
27	10.4.52.52/31	10.4.52.52 – 10.4.52.53	10.4.52.53
28	10.4.52.54/31	10.4.52.54 – 10.4.52.55	10.4.52.55
29	10.4.52.56/31	10.4.52.56 – 10.4.52.57	10.4.52.57
30	10.4.52.58/31	10.4.52.58 – 10.4.52.59	10.4.52.59
31	10.4.52.60/31	10.4.52.60 – 10.4.52.61	10.4.52.61
32	10.4.52.62/31	10.4.52.62 – 10.4.52.63	10.4.52.63
33	10.4.52.64/31	10.4.52.64 – 10.4.52.65	10.4.52.65
34	10.4.52.66/31	10.4.52.66 – 10.4.52.67	10.4.52.67
35	10.4.52.68/31	10.4.52.68 – 10.4.52.69	10.4.52.69
36	10.4.52.70/31	10.4.52.70 – 10.4.52.71	10.4.52.71
37	10.4.52.72/31	10.4.52.72 – 10.4.52.73	10.4.52.73
38	10.4.52.74/31	10.4.52.74 – 10.4.52.75	10.4.52.75
39	10.4.52.76/31	10.4.52.76 – 10.4.52.77	10.4.52.77
40	10.4.52.78/31	10.4.52.78 – 10.4.52.79	10.4.52.79
41	10.4.52.80/31	10.4.52.80 – 10.4.52.81	10.4.52.81
42	10.4.52.82/31	10.4.52.82 – 10.4.52.83	10.4.52.83
43	10.4.52.84/31	10.4.52.84 – 10.4.52.85	10.4.52.85
44	10.4.52.86/31	10.4.52.86 – 10.4.52.87	10.4.52.87
45	10.4.52.88/31	10.4.52.88 – 10.4.52.89	10.4.52.89
46	10.4.52.90/31	10.4.52.90 – 10.4.52.91	10.4.52.91
47	10.4.52.92/31	10.4.52.92 – 10.4.52.93	10.4.52.93
48	10.4.52.94/31	10.4.52.94 – 10.4.52.95	10.4.52.95
49	10.4.52.96/31	10.4.52.96 – 10.4.52.97	10.4.52.97
50	10.4.52.98/31	10.4.52.98 – 10.4.52.99	10.4.52.99
51	10.4.52.100/31	10.4.52.100 – 10.4.52.101	10.4.52.101
52	10.4.52.102/31	10.4.52.102 – 10.4.52.103	10.4.52.103
53	10.4.52.104/31	10.4.52.104 – 10.4.52.105	10.4.52.105
54	10.4.52.106/31	10.4.52.106 – 10.4.52.107	10.4.52.107
55	10.4.52.108/31	10.4.52.108 – 10.4.52.109	10.4.52.109
56	10.4.52.110/31	10.4.52.110 – 10.4.52.111	10.4.52.111
57	10.4.52.112/31	10.4.52.112 – 10.4.52.113	10.4.52.113
58	10.4.52.114/31	10.4.52.114 – 10.4.52.115	10.4.52.115
59	10.4.52.116/31	10.4.52.116 – 10.4.52.117	10.4.52.117
60	10.4.52.118/31	10.4.52.118 – 10.4.52.119	10.4.52.119
61	10.4.52.120/31	10.4.52.120 – 10.4.52.121	10.4.52.121
62	10.4.52.122/31	10.4.52.122 – 10.4.52.123	10.4.52.123
63	10.4.52.124/31	10.4.52.124 – 10.4.52.125	10.4.52.125
64	10.4.52.126/31	10.4.52.126 – 10.4.52.127	10.4.52.127

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