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)10.149.30.0/25

network10.149.30.0/25

broadcast10.149.30.127

first host10.149.30.1

last host10.149.30.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.149.30.0/25

address00001010.10010101.00011110.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10010101.00011110.00000000

broadcast00001010.10010101.00011110.01111111

green = network part, grey = host part

hex0x0a951e00

decimal177544704

reverse dns0.30.149.10.in-addr.arpa

ipv4-mapped::ffff:a95:1e00

/25 split into /31 · 64 subnets

close ×

#	network	host range	broadcast
1	10.149.30.0/31	10.149.30.0 – 10.149.30.1	10.149.30.1
2	10.149.30.2/31	10.149.30.2 – 10.149.30.3	10.149.30.3
3	10.149.30.4/31	10.149.30.4 – 10.149.30.5	10.149.30.5
4	10.149.30.6/31	10.149.30.6 – 10.149.30.7	10.149.30.7
5	10.149.30.8/31	10.149.30.8 – 10.149.30.9	10.149.30.9
6	10.149.30.10/31	10.149.30.10 – 10.149.30.11	10.149.30.11
7	10.149.30.12/31	10.149.30.12 – 10.149.30.13	10.149.30.13
8	10.149.30.14/31	10.149.30.14 – 10.149.30.15	10.149.30.15
9	10.149.30.16/31	10.149.30.16 – 10.149.30.17	10.149.30.17
10	10.149.30.18/31	10.149.30.18 – 10.149.30.19	10.149.30.19
11	10.149.30.20/31	10.149.30.20 – 10.149.30.21	10.149.30.21
12	10.149.30.22/31	10.149.30.22 – 10.149.30.23	10.149.30.23
13	10.149.30.24/31	10.149.30.24 – 10.149.30.25	10.149.30.25
14	10.149.30.26/31	10.149.30.26 – 10.149.30.27	10.149.30.27
15	10.149.30.28/31	10.149.30.28 – 10.149.30.29	10.149.30.29
16	10.149.30.30/31	10.149.30.30 – 10.149.30.31	10.149.30.31
17	10.149.30.32/31	10.149.30.32 – 10.149.30.33	10.149.30.33
18	10.149.30.34/31	10.149.30.34 – 10.149.30.35	10.149.30.35
19	10.149.30.36/31	10.149.30.36 – 10.149.30.37	10.149.30.37
20	10.149.30.38/31	10.149.30.38 – 10.149.30.39	10.149.30.39
21	10.149.30.40/31	10.149.30.40 – 10.149.30.41	10.149.30.41
22	10.149.30.42/31	10.149.30.42 – 10.149.30.43	10.149.30.43
23	10.149.30.44/31	10.149.30.44 – 10.149.30.45	10.149.30.45
24	10.149.30.46/31	10.149.30.46 – 10.149.30.47	10.149.30.47
25	10.149.30.48/31	10.149.30.48 – 10.149.30.49	10.149.30.49
26	10.149.30.50/31	10.149.30.50 – 10.149.30.51	10.149.30.51
27	10.149.30.52/31	10.149.30.52 – 10.149.30.53	10.149.30.53
28	10.149.30.54/31	10.149.30.54 – 10.149.30.55	10.149.30.55
29	10.149.30.56/31	10.149.30.56 – 10.149.30.57	10.149.30.57
30	10.149.30.58/31	10.149.30.58 – 10.149.30.59	10.149.30.59
31	10.149.30.60/31	10.149.30.60 – 10.149.30.61	10.149.30.61
32	10.149.30.62/31	10.149.30.62 – 10.149.30.63	10.149.30.63
33	10.149.30.64/31	10.149.30.64 – 10.149.30.65	10.149.30.65
34	10.149.30.66/31	10.149.30.66 – 10.149.30.67	10.149.30.67
35	10.149.30.68/31	10.149.30.68 – 10.149.30.69	10.149.30.69
36	10.149.30.70/31	10.149.30.70 – 10.149.30.71	10.149.30.71
37	10.149.30.72/31	10.149.30.72 – 10.149.30.73	10.149.30.73
38	10.149.30.74/31	10.149.30.74 – 10.149.30.75	10.149.30.75
39	10.149.30.76/31	10.149.30.76 – 10.149.30.77	10.149.30.77
40	10.149.30.78/31	10.149.30.78 – 10.149.30.79	10.149.30.79
41	10.149.30.80/31	10.149.30.80 – 10.149.30.81	10.149.30.81
42	10.149.30.82/31	10.149.30.82 – 10.149.30.83	10.149.30.83
43	10.149.30.84/31	10.149.30.84 – 10.149.30.85	10.149.30.85
44	10.149.30.86/31	10.149.30.86 – 10.149.30.87	10.149.30.87
45	10.149.30.88/31	10.149.30.88 – 10.149.30.89	10.149.30.89
46	10.149.30.90/31	10.149.30.90 – 10.149.30.91	10.149.30.91
47	10.149.30.92/31	10.149.30.92 – 10.149.30.93	10.149.30.93
48	10.149.30.94/31	10.149.30.94 – 10.149.30.95	10.149.30.95
49	10.149.30.96/31	10.149.30.96 – 10.149.30.97	10.149.30.97
50	10.149.30.98/31	10.149.30.98 – 10.149.30.99	10.149.30.99
51	10.149.30.100/31	10.149.30.100 – 10.149.30.101	10.149.30.101
52	10.149.30.102/31	10.149.30.102 – 10.149.30.103	10.149.30.103
53	10.149.30.104/31	10.149.30.104 – 10.149.30.105	10.149.30.105
54	10.149.30.106/31	10.149.30.106 – 10.149.30.107	10.149.30.107
55	10.149.30.108/31	10.149.30.108 – 10.149.30.109	10.149.30.109
56	10.149.30.110/31	10.149.30.110 – 10.149.30.111	10.149.30.111
57	10.149.30.112/31	10.149.30.112 – 10.149.30.113	10.149.30.113
58	10.149.30.114/31	10.149.30.114 – 10.149.30.115	10.149.30.115
59	10.149.30.116/31	10.149.30.116 – 10.149.30.117	10.149.30.117
60	10.149.30.118/31	10.149.30.118 – 10.149.30.119	10.149.30.119
61	10.149.30.120/31	10.149.30.120 – 10.149.30.121	10.149.30.121
62	10.149.30.122/31	10.149.30.122 – 10.149.30.123	10.149.30.123
63	10.149.30.124/31	10.149.30.124 – 10.149.30.125	10.149.30.125
64	10.149.30.126/31	10.149.30.126 – 10.149.30.127	10.149.30.127

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 →