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)10.167.41.0/25

network10.167.41.0/25

broadcast10.167.41.127

first host10.167.41.1

last host10.167.41.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.41.0/25

address00001010.10100111.00101001.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.00101001.00000000

broadcast00001010.10100111.00101001.01111111

green = network part, grey = host part

hex0x0aa72900

decimal178727168

reverse dns0.41.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:2900

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.167.41.0/31	10.167.41.0 – 10.167.41.1	10.167.41.1
2	10.167.41.2/31	10.167.41.2 – 10.167.41.3	10.167.41.3
3	10.167.41.4/31	10.167.41.4 – 10.167.41.5	10.167.41.5
4	10.167.41.6/31	10.167.41.6 – 10.167.41.7	10.167.41.7
5	10.167.41.8/31	10.167.41.8 – 10.167.41.9	10.167.41.9
6	10.167.41.10/31	10.167.41.10 – 10.167.41.11	10.167.41.11
7	10.167.41.12/31	10.167.41.12 – 10.167.41.13	10.167.41.13
8	10.167.41.14/31	10.167.41.14 – 10.167.41.15	10.167.41.15
9	10.167.41.16/31	10.167.41.16 – 10.167.41.17	10.167.41.17
10	10.167.41.18/31	10.167.41.18 – 10.167.41.19	10.167.41.19
11	10.167.41.20/31	10.167.41.20 – 10.167.41.21	10.167.41.21
12	10.167.41.22/31	10.167.41.22 – 10.167.41.23	10.167.41.23
13	10.167.41.24/31	10.167.41.24 – 10.167.41.25	10.167.41.25
14	10.167.41.26/31	10.167.41.26 – 10.167.41.27	10.167.41.27
15	10.167.41.28/31	10.167.41.28 – 10.167.41.29	10.167.41.29
16	10.167.41.30/31	10.167.41.30 – 10.167.41.31	10.167.41.31
17	10.167.41.32/31	10.167.41.32 – 10.167.41.33	10.167.41.33
18	10.167.41.34/31	10.167.41.34 – 10.167.41.35	10.167.41.35
19	10.167.41.36/31	10.167.41.36 – 10.167.41.37	10.167.41.37
20	10.167.41.38/31	10.167.41.38 – 10.167.41.39	10.167.41.39
21	10.167.41.40/31	10.167.41.40 – 10.167.41.41	10.167.41.41
22	10.167.41.42/31	10.167.41.42 – 10.167.41.43	10.167.41.43
23	10.167.41.44/31	10.167.41.44 – 10.167.41.45	10.167.41.45
24	10.167.41.46/31	10.167.41.46 – 10.167.41.47	10.167.41.47
25	10.167.41.48/31	10.167.41.48 – 10.167.41.49	10.167.41.49
26	10.167.41.50/31	10.167.41.50 – 10.167.41.51	10.167.41.51
27	10.167.41.52/31	10.167.41.52 – 10.167.41.53	10.167.41.53
28	10.167.41.54/31	10.167.41.54 – 10.167.41.55	10.167.41.55
29	10.167.41.56/31	10.167.41.56 – 10.167.41.57	10.167.41.57
30	10.167.41.58/31	10.167.41.58 – 10.167.41.59	10.167.41.59
31	10.167.41.60/31	10.167.41.60 – 10.167.41.61	10.167.41.61
32	10.167.41.62/31	10.167.41.62 – 10.167.41.63	10.167.41.63
33	10.167.41.64/31	10.167.41.64 – 10.167.41.65	10.167.41.65
34	10.167.41.66/31	10.167.41.66 – 10.167.41.67	10.167.41.67
35	10.167.41.68/31	10.167.41.68 – 10.167.41.69	10.167.41.69
36	10.167.41.70/31	10.167.41.70 – 10.167.41.71	10.167.41.71
37	10.167.41.72/31	10.167.41.72 – 10.167.41.73	10.167.41.73
38	10.167.41.74/31	10.167.41.74 – 10.167.41.75	10.167.41.75
39	10.167.41.76/31	10.167.41.76 – 10.167.41.77	10.167.41.77
40	10.167.41.78/31	10.167.41.78 – 10.167.41.79	10.167.41.79
41	10.167.41.80/31	10.167.41.80 – 10.167.41.81	10.167.41.81
42	10.167.41.82/31	10.167.41.82 – 10.167.41.83	10.167.41.83
43	10.167.41.84/31	10.167.41.84 – 10.167.41.85	10.167.41.85
44	10.167.41.86/31	10.167.41.86 – 10.167.41.87	10.167.41.87
45	10.167.41.88/31	10.167.41.88 – 10.167.41.89	10.167.41.89
46	10.167.41.90/31	10.167.41.90 – 10.167.41.91	10.167.41.91
47	10.167.41.92/31	10.167.41.92 – 10.167.41.93	10.167.41.93
48	10.167.41.94/31	10.167.41.94 – 10.167.41.95	10.167.41.95
49	10.167.41.96/31	10.167.41.96 – 10.167.41.97	10.167.41.97
50	10.167.41.98/31	10.167.41.98 – 10.167.41.99	10.167.41.99
51	10.167.41.100/31	10.167.41.100 – 10.167.41.101	10.167.41.101
52	10.167.41.102/31	10.167.41.102 – 10.167.41.103	10.167.41.103
53	10.167.41.104/31	10.167.41.104 – 10.167.41.105	10.167.41.105
54	10.167.41.106/31	10.167.41.106 – 10.167.41.107	10.167.41.107
55	10.167.41.108/31	10.167.41.108 – 10.167.41.109	10.167.41.109
56	10.167.41.110/31	10.167.41.110 – 10.167.41.111	10.167.41.111
57	10.167.41.112/31	10.167.41.112 – 10.167.41.113	10.167.41.113
58	10.167.41.114/31	10.167.41.114 – 10.167.41.115	10.167.41.115
59	10.167.41.116/31	10.167.41.116 – 10.167.41.117	10.167.41.117
60	10.167.41.118/31	10.167.41.118 – 10.167.41.119	10.167.41.119
61	10.167.41.120/31	10.167.41.120 – 10.167.41.121	10.167.41.121
62	10.167.41.122/31	10.167.41.122 – 10.167.41.123	10.167.41.123
63	10.167.41.124/31	10.167.41.124 – 10.167.41.125	10.167.41.125
64	10.167.41.126/31	10.167.41.126 – 10.167.41.127	10.167.41.127

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 →