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)10.2.124.0/25

network10.2.124.0/25

broadcast10.2.124.127

first host10.2.124.1

last host10.2.124.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.2.124.0/25

address00001010.00000010.01111100.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000010.01111100.00000000

broadcast00001010.00000010.01111100.01111111

green = network part, grey = host part

hex0x0a027c00

decimal167934976

reverse dns0.124.2.10.in-addr.arpa

ipv4-mapped::ffff:a02:7c00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.2.124.0/32	10.2.124.0 – 10.2.124.0	10.2.124.0
2	10.2.124.1/32	10.2.124.1 – 10.2.124.1	10.2.124.1
3	10.2.124.2/32	10.2.124.2 – 10.2.124.2	10.2.124.2
4	10.2.124.3/32	10.2.124.3 – 10.2.124.3	10.2.124.3
5	10.2.124.4/32	10.2.124.4 – 10.2.124.4	10.2.124.4
6	10.2.124.5/32	10.2.124.5 – 10.2.124.5	10.2.124.5
7	10.2.124.6/32	10.2.124.6 – 10.2.124.6	10.2.124.6
8	10.2.124.7/32	10.2.124.7 – 10.2.124.7	10.2.124.7
9	10.2.124.8/32	10.2.124.8 – 10.2.124.8	10.2.124.8
10	10.2.124.9/32	10.2.124.9 – 10.2.124.9	10.2.124.9
11	10.2.124.10/32	10.2.124.10 – 10.2.124.10	10.2.124.10
12	10.2.124.11/32	10.2.124.11 – 10.2.124.11	10.2.124.11
13	10.2.124.12/32	10.2.124.12 – 10.2.124.12	10.2.124.12
14	10.2.124.13/32	10.2.124.13 – 10.2.124.13	10.2.124.13
15	10.2.124.14/32	10.2.124.14 – 10.2.124.14	10.2.124.14
16	10.2.124.15/32	10.2.124.15 – 10.2.124.15	10.2.124.15
17	10.2.124.16/32	10.2.124.16 – 10.2.124.16	10.2.124.16
18	10.2.124.17/32	10.2.124.17 – 10.2.124.17	10.2.124.17
19	10.2.124.18/32	10.2.124.18 – 10.2.124.18	10.2.124.18
20	10.2.124.19/32	10.2.124.19 – 10.2.124.19	10.2.124.19
21	10.2.124.20/32	10.2.124.20 – 10.2.124.20	10.2.124.20
22	10.2.124.21/32	10.2.124.21 – 10.2.124.21	10.2.124.21
23	10.2.124.22/32	10.2.124.22 – 10.2.124.22	10.2.124.22
24	10.2.124.23/32	10.2.124.23 – 10.2.124.23	10.2.124.23
25	10.2.124.24/32	10.2.124.24 – 10.2.124.24	10.2.124.24
26	10.2.124.25/32	10.2.124.25 – 10.2.124.25	10.2.124.25
27	10.2.124.26/32	10.2.124.26 – 10.2.124.26	10.2.124.26
28	10.2.124.27/32	10.2.124.27 – 10.2.124.27	10.2.124.27
29	10.2.124.28/32	10.2.124.28 – 10.2.124.28	10.2.124.28
30	10.2.124.29/32	10.2.124.29 – 10.2.124.29	10.2.124.29
31	10.2.124.30/32	10.2.124.30 – 10.2.124.30	10.2.124.30
32	10.2.124.31/32	10.2.124.31 – 10.2.124.31	10.2.124.31
33	10.2.124.32/32	10.2.124.32 – 10.2.124.32	10.2.124.32
34	10.2.124.33/32	10.2.124.33 – 10.2.124.33	10.2.124.33
35	10.2.124.34/32	10.2.124.34 – 10.2.124.34	10.2.124.34
36	10.2.124.35/32	10.2.124.35 – 10.2.124.35	10.2.124.35
37	10.2.124.36/32	10.2.124.36 – 10.2.124.36	10.2.124.36
38	10.2.124.37/32	10.2.124.37 – 10.2.124.37	10.2.124.37
39	10.2.124.38/32	10.2.124.38 – 10.2.124.38	10.2.124.38
40	10.2.124.39/32	10.2.124.39 – 10.2.124.39	10.2.124.39
41	10.2.124.40/32	10.2.124.40 – 10.2.124.40	10.2.124.40
42	10.2.124.41/32	10.2.124.41 – 10.2.124.41	10.2.124.41
43	10.2.124.42/32	10.2.124.42 – 10.2.124.42	10.2.124.42
44	10.2.124.43/32	10.2.124.43 – 10.2.124.43	10.2.124.43
45	10.2.124.44/32	10.2.124.44 – 10.2.124.44	10.2.124.44
46	10.2.124.45/32	10.2.124.45 – 10.2.124.45	10.2.124.45
47	10.2.124.46/32	10.2.124.46 – 10.2.124.46	10.2.124.46
48	10.2.124.47/32	10.2.124.47 – 10.2.124.47	10.2.124.47
49	10.2.124.48/32	10.2.124.48 – 10.2.124.48	10.2.124.48
50	10.2.124.49/32	10.2.124.49 – 10.2.124.49	10.2.124.49
51	10.2.124.50/32	10.2.124.50 – 10.2.124.50	10.2.124.50
52	10.2.124.51/32	10.2.124.51 – 10.2.124.51	10.2.124.51
53	10.2.124.52/32	10.2.124.52 – 10.2.124.52	10.2.124.52
54	10.2.124.53/32	10.2.124.53 – 10.2.124.53	10.2.124.53
55	10.2.124.54/32	10.2.124.54 – 10.2.124.54	10.2.124.54
56	10.2.124.55/32	10.2.124.55 – 10.2.124.55	10.2.124.55
57	10.2.124.56/32	10.2.124.56 – 10.2.124.56	10.2.124.56
58	10.2.124.57/32	10.2.124.57 – 10.2.124.57	10.2.124.57
59	10.2.124.58/32	10.2.124.58 – 10.2.124.58	10.2.124.58
60	10.2.124.59/32	10.2.124.59 – 10.2.124.59	10.2.124.59
61	10.2.124.60/32	10.2.124.60 – 10.2.124.60	10.2.124.60
62	10.2.124.61/32	10.2.124.61 – 10.2.124.61	10.2.124.61
63	10.2.124.62/32	10.2.124.62 – 10.2.124.62	10.2.124.62
64	10.2.124.63/32	10.2.124.63 – 10.2.124.63	10.2.124.63
65	10.2.124.64/32	10.2.124.64 – 10.2.124.64	10.2.124.64
66	10.2.124.65/32	10.2.124.65 – 10.2.124.65	10.2.124.65
67	10.2.124.66/32	10.2.124.66 – 10.2.124.66	10.2.124.66
68	10.2.124.67/32	10.2.124.67 – 10.2.124.67	10.2.124.67
69	10.2.124.68/32	10.2.124.68 – 10.2.124.68	10.2.124.68
70	10.2.124.69/32	10.2.124.69 – 10.2.124.69	10.2.124.69
71	10.2.124.70/32	10.2.124.70 – 10.2.124.70	10.2.124.70
72	10.2.124.71/32	10.2.124.71 – 10.2.124.71	10.2.124.71
73	10.2.124.72/32	10.2.124.72 – 10.2.124.72	10.2.124.72
74	10.2.124.73/32	10.2.124.73 – 10.2.124.73	10.2.124.73
75	10.2.124.74/32	10.2.124.74 – 10.2.124.74	10.2.124.74
76	10.2.124.75/32	10.2.124.75 – 10.2.124.75	10.2.124.75
77	10.2.124.76/32	10.2.124.76 – 10.2.124.76	10.2.124.76
78	10.2.124.77/32	10.2.124.77 – 10.2.124.77	10.2.124.77
79	10.2.124.78/32	10.2.124.78 – 10.2.124.78	10.2.124.78
80	10.2.124.79/32	10.2.124.79 – 10.2.124.79	10.2.124.79
81	10.2.124.80/32	10.2.124.80 – 10.2.124.80	10.2.124.80
82	10.2.124.81/32	10.2.124.81 – 10.2.124.81	10.2.124.81
83	10.2.124.82/32	10.2.124.82 – 10.2.124.82	10.2.124.82
84	10.2.124.83/32	10.2.124.83 – 10.2.124.83	10.2.124.83
85	10.2.124.84/32	10.2.124.84 – 10.2.124.84	10.2.124.84
86	10.2.124.85/32	10.2.124.85 – 10.2.124.85	10.2.124.85
87	10.2.124.86/32	10.2.124.86 – 10.2.124.86	10.2.124.86
88	10.2.124.87/32	10.2.124.87 – 10.2.124.87	10.2.124.87
89	10.2.124.88/32	10.2.124.88 – 10.2.124.88	10.2.124.88
90	10.2.124.89/32	10.2.124.89 – 10.2.124.89	10.2.124.89
91	10.2.124.90/32	10.2.124.90 – 10.2.124.90	10.2.124.90
92	10.2.124.91/32	10.2.124.91 – 10.2.124.91	10.2.124.91
93	10.2.124.92/32	10.2.124.92 – 10.2.124.92	10.2.124.92
94	10.2.124.93/32	10.2.124.93 – 10.2.124.93	10.2.124.93
95	10.2.124.94/32	10.2.124.94 – 10.2.124.94	10.2.124.94
96	10.2.124.95/32	10.2.124.95 – 10.2.124.95	10.2.124.95
97	10.2.124.96/32	10.2.124.96 – 10.2.124.96	10.2.124.96
98	10.2.124.97/32	10.2.124.97 – 10.2.124.97	10.2.124.97
99	10.2.124.98/32	10.2.124.98 – 10.2.124.98	10.2.124.98
100	10.2.124.99/32	10.2.124.99 – 10.2.124.99	10.2.124.99
101	10.2.124.100/32	10.2.124.100 – 10.2.124.100	10.2.124.100
102	10.2.124.101/32	10.2.124.101 – 10.2.124.101	10.2.124.101
103	10.2.124.102/32	10.2.124.102 – 10.2.124.102	10.2.124.102
104	10.2.124.103/32	10.2.124.103 – 10.2.124.103	10.2.124.103
105	10.2.124.104/32	10.2.124.104 – 10.2.124.104	10.2.124.104
106	10.2.124.105/32	10.2.124.105 – 10.2.124.105	10.2.124.105
107	10.2.124.106/32	10.2.124.106 – 10.2.124.106	10.2.124.106
108	10.2.124.107/32	10.2.124.107 – 10.2.124.107	10.2.124.107
109	10.2.124.108/32	10.2.124.108 – 10.2.124.108	10.2.124.108
110	10.2.124.109/32	10.2.124.109 – 10.2.124.109	10.2.124.109
111	10.2.124.110/32	10.2.124.110 – 10.2.124.110	10.2.124.110
112	10.2.124.111/32	10.2.124.111 – 10.2.124.111	10.2.124.111
113	10.2.124.112/32	10.2.124.112 – 10.2.124.112	10.2.124.112
114	10.2.124.113/32	10.2.124.113 – 10.2.124.113	10.2.124.113
115	10.2.124.114/32	10.2.124.114 – 10.2.124.114	10.2.124.114
116	10.2.124.115/32	10.2.124.115 – 10.2.124.115	10.2.124.115
117	10.2.124.116/32	10.2.124.116 – 10.2.124.116	10.2.124.116
118	10.2.124.117/32	10.2.124.117 – 10.2.124.117	10.2.124.117
119	10.2.124.118/32	10.2.124.118 – 10.2.124.118	10.2.124.118
120	10.2.124.119/32	10.2.124.119 – 10.2.124.119	10.2.124.119
121	10.2.124.120/32	10.2.124.120 – 10.2.124.120	10.2.124.120
122	10.2.124.121/32	10.2.124.121 – 10.2.124.121	10.2.124.121
123	10.2.124.122/32	10.2.124.122 – 10.2.124.122	10.2.124.122
124	10.2.124.123/32	10.2.124.123 – 10.2.124.123	10.2.124.123
125	10.2.124.124/32	10.2.124.124 – 10.2.124.124	10.2.124.124
126	10.2.124.125/32	10.2.124.125 – 10.2.124.125	10.2.124.125
127	10.2.124.126/32	10.2.124.126 – 10.2.124.126	10.2.124.126
128	10.2.124.127/32	10.2.124.127 – 10.2.124.127	10.2.124.127

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 →