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)10.4.69.0/25

network10.4.69.0/25

broadcast10.4.69.127

first host10.4.69.1

last host10.4.69.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.4.69.0/25

address00001010.00000100.01000101.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000100.01000101.00000000

broadcast00001010.00000100.01000101.01111111

green = network part, grey = host part

hex0x0a044500

decimal168051968

reverse dns0.69.4.10.in-addr.arpa

ipv4-mapped::ffff:a04:4500

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.4.69.0/31	10.4.69.0 – 10.4.69.1	10.4.69.1
2	10.4.69.2/31	10.4.69.2 – 10.4.69.3	10.4.69.3
3	10.4.69.4/31	10.4.69.4 – 10.4.69.5	10.4.69.5
4	10.4.69.6/31	10.4.69.6 – 10.4.69.7	10.4.69.7
5	10.4.69.8/31	10.4.69.8 – 10.4.69.9	10.4.69.9
6	10.4.69.10/31	10.4.69.10 – 10.4.69.11	10.4.69.11
7	10.4.69.12/31	10.4.69.12 – 10.4.69.13	10.4.69.13
8	10.4.69.14/31	10.4.69.14 – 10.4.69.15	10.4.69.15
9	10.4.69.16/31	10.4.69.16 – 10.4.69.17	10.4.69.17
10	10.4.69.18/31	10.4.69.18 – 10.4.69.19	10.4.69.19
11	10.4.69.20/31	10.4.69.20 – 10.4.69.21	10.4.69.21
12	10.4.69.22/31	10.4.69.22 – 10.4.69.23	10.4.69.23
13	10.4.69.24/31	10.4.69.24 – 10.4.69.25	10.4.69.25
14	10.4.69.26/31	10.4.69.26 – 10.4.69.27	10.4.69.27
15	10.4.69.28/31	10.4.69.28 – 10.4.69.29	10.4.69.29
16	10.4.69.30/31	10.4.69.30 – 10.4.69.31	10.4.69.31
17	10.4.69.32/31	10.4.69.32 – 10.4.69.33	10.4.69.33
18	10.4.69.34/31	10.4.69.34 – 10.4.69.35	10.4.69.35
19	10.4.69.36/31	10.4.69.36 – 10.4.69.37	10.4.69.37
20	10.4.69.38/31	10.4.69.38 – 10.4.69.39	10.4.69.39
21	10.4.69.40/31	10.4.69.40 – 10.4.69.41	10.4.69.41
22	10.4.69.42/31	10.4.69.42 – 10.4.69.43	10.4.69.43
23	10.4.69.44/31	10.4.69.44 – 10.4.69.45	10.4.69.45
24	10.4.69.46/31	10.4.69.46 – 10.4.69.47	10.4.69.47
25	10.4.69.48/31	10.4.69.48 – 10.4.69.49	10.4.69.49
26	10.4.69.50/31	10.4.69.50 – 10.4.69.51	10.4.69.51
27	10.4.69.52/31	10.4.69.52 – 10.4.69.53	10.4.69.53
28	10.4.69.54/31	10.4.69.54 – 10.4.69.55	10.4.69.55
29	10.4.69.56/31	10.4.69.56 – 10.4.69.57	10.4.69.57
30	10.4.69.58/31	10.4.69.58 – 10.4.69.59	10.4.69.59
31	10.4.69.60/31	10.4.69.60 – 10.4.69.61	10.4.69.61
32	10.4.69.62/31	10.4.69.62 – 10.4.69.63	10.4.69.63
33	10.4.69.64/31	10.4.69.64 – 10.4.69.65	10.4.69.65
34	10.4.69.66/31	10.4.69.66 – 10.4.69.67	10.4.69.67
35	10.4.69.68/31	10.4.69.68 – 10.4.69.69	10.4.69.69
36	10.4.69.70/31	10.4.69.70 – 10.4.69.71	10.4.69.71
37	10.4.69.72/31	10.4.69.72 – 10.4.69.73	10.4.69.73
38	10.4.69.74/31	10.4.69.74 – 10.4.69.75	10.4.69.75
39	10.4.69.76/31	10.4.69.76 – 10.4.69.77	10.4.69.77
40	10.4.69.78/31	10.4.69.78 – 10.4.69.79	10.4.69.79
41	10.4.69.80/31	10.4.69.80 – 10.4.69.81	10.4.69.81
42	10.4.69.82/31	10.4.69.82 – 10.4.69.83	10.4.69.83
43	10.4.69.84/31	10.4.69.84 – 10.4.69.85	10.4.69.85
44	10.4.69.86/31	10.4.69.86 – 10.4.69.87	10.4.69.87
45	10.4.69.88/31	10.4.69.88 – 10.4.69.89	10.4.69.89
46	10.4.69.90/31	10.4.69.90 – 10.4.69.91	10.4.69.91
47	10.4.69.92/31	10.4.69.92 – 10.4.69.93	10.4.69.93
48	10.4.69.94/31	10.4.69.94 – 10.4.69.95	10.4.69.95
49	10.4.69.96/31	10.4.69.96 – 10.4.69.97	10.4.69.97
50	10.4.69.98/31	10.4.69.98 – 10.4.69.99	10.4.69.99
51	10.4.69.100/31	10.4.69.100 – 10.4.69.101	10.4.69.101
52	10.4.69.102/31	10.4.69.102 – 10.4.69.103	10.4.69.103
53	10.4.69.104/31	10.4.69.104 – 10.4.69.105	10.4.69.105
54	10.4.69.106/31	10.4.69.106 – 10.4.69.107	10.4.69.107
55	10.4.69.108/31	10.4.69.108 – 10.4.69.109	10.4.69.109
56	10.4.69.110/31	10.4.69.110 – 10.4.69.111	10.4.69.111
57	10.4.69.112/31	10.4.69.112 – 10.4.69.113	10.4.69.113
58	10.4.69.114/31	10.4.69.114 – 10.4.69.115	10.4.69.115
59	10.4.69.116/31	10.4.69.116 – 10.4.69.117	10.4.69.117
60	10.4.69.118/31	10.4.69.118 – 10.4.69.119	10.4.69.119
61	10.4.69.120/31	10.4.69.120 – 10.4.69.121	10.4.69.121
62	10.4.69.122/31	10.4.69.122 – 10.4.69.123	10.4.69.123
63	10.4.69.124/31	10.4.69.124 – 10.4.69.125	10.4.69.125
64	10.4.69.126/31	10.4.69.126 – 10.4.69.127	10.4.69.127

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 →