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)10.9.9.0/25

network10.9.9.0/25

broadcast10.9.9.127

first host10.9.9.1

last host10.9.9.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.9.9.0/25

address00001010.00001001.00001001.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00001001.00001001.00000000

broadcast00001010.00001001.00001001.01111111

green = network part, grey = host part

hex0x0a090900

decimal168364288

reverse dns0.9.9.10.in-addr.arpa

ipv4-mapped::ffff:a09:900

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.9.9.0/32	10.9.9.0 – 10.9.9.0	10.9.9.0
2	10.9.9.1/32	10.9.9.1 – 10.9.9.1	10.9.9.1
3	10.9.9.2/32	10.9.9.2 – 10.9.9.2	10.9.9.2
4	10.9.9.3/32	10.9.9.3 – 10.9.9.3	10.9.9.3
5	10.9.9.4/32	10.9.9.4 – 10.9.9.4	10.9.9.4
6	10.9.9.5/32	10.9.9.5 – 10.9.9.5	10.9.9.5
7	10.9.9.6/32	10.9.9.6 – 10.9.9.6	10.9.9.6
8	10.9.9.7/32	10.9.9.7 – 10.9.9.7	10.9.9.7
9	10.9.9.8/32	10.9.9.8 – 10.9.9.8	10.9.9.8
10	10.9.9.9/32	10.9.9.9 – 10.9.9.9	10.9.9.9
11	10.9.9.10/32	10.9.9.10 – 10.9.9.10	10.9.9.10
12	10.9.9.11/32	10.9.9.11 – 10.9.9.11	10.9.9.11
13	10.9.9.12/32	10.9.9.12 – 10.9.9.12	10.9.9.12
14	10.9.9.13/32	10.9.9.13 – 10.9.9.13	10.9.9.13
15	10.9.9.14/32	10.9.9.14 – 10.9.9.14	10.9.9.14
16	10.9.9.15/32	10.9.9.15 – 10.9.9.15	10.9.9.15
17	10.9.9.16/32	10.9.9.16 – 10.9.9.16	10.9.9.16
18	10.9.9.17/32	10.9.9.17 – 10.9.9.17	10.9.9.17
19	10.9.9.18/32	10.9.9.18 – 10.9.9.18	10.9.9.18
20	10.9.9.19/32	10.9.9.19 – 10.9.9.19	10.9.9.19
21	10.9.9.20/32	10.9.9.20 – 10.9.9.20	10.9.9.20
22	10.9.9.21/32	10.9.9.21 – 10.9.9.21	10.9.9.21
23	10.9.9.22/32	10.9.9.22 – 10.9.9.22	10.9.9.22
24	10.9.9.23/32	10.9.9.23 – 10.9.9.23	10.9.9.23
25	10.9.9.24/32	10.9.9.24 – 10.9.9.24	10.9.9.24
26	10.9.9.25/32	10.9.9.25 – 10.9.9.25	10.9.9.25
27	10.9.9.26/32	10.9.9.26 – 10.9.9.26	10.9.9.26
28	10.9.9.27/32	10.9.9.27 – 10.9.9.27	10.9.9.27
29	10.9.9.28/32	10.9.9.28 – 10.9.9.28	10.9.9.28
30	10.9.9.29/32	10.9.9.29 – 10.9.9.29	10.9.9.29
31	10.9.9.30/32	10.9.9.30 – 10.9.9.30	10.9.9.30
32	10.9.9.31/32	10.9.9.31 – 10.9.9.31	10.9.9.31
33	10.9.9.32/32	10.9.9.32 – 10.9.9.32	10.9.9.32
34	10.9.9.33/32	10.9.9.33 – 10.9.9.33	10.9.9.33
35	10.9.9.34/32	10.9.9.34 – 10.9.9.34	10.9.9.34
36	10.9.9.35/32	10.9.9.35 – 10.9.9.35	10.9.9.35
37	10.9.9.36/32	10.9.9.36 – 10.9.9.36	10.9.9.36
38	10.9.9.37/32	10.9.9.37 – 10.9.9.37	10.9.9.37
39	10.9.9.38/32	10.9.9.38 – 10.9.9.38	10.9.9.38
40	10.9.9.39/32	10.9.9.39 – 10.9.9.39	10.9.9.39
41	10.9.9.40/32	10.9.9.40 – 10.9.9.40	10.9.9.40
42	10.9.9.41/32	10.9.9.41 – 10.9.9.41	10.9.9.41
43	10.9.9.42/32	10.9.9.42 – 10.9.9.42	10.9.9.42
44	10.9.9.43/32	10.9.9.43 – 10.9.9.43	10.9.9.43
45	10.9.9.44/32	10.9.9.44 – 10.9.9.44	10.9.9.44
46	10.9.9.45/32	10.9.9.45 – 10.9.9.45	10.9.9.45
47	10.9.9.46/32	10.9.9.46 – 10.9.9.46	10.9.9.46
48	10.9.9.47/32	10.9.9.47 – 10.9.9.47	10.9.9.47
49	10.9.9.48/32	10.9.9.48 – 10.9.9.48	10.9.9.48
50	10.9.9.49/32	10.9.9.49 – 10.9.9.49	10.9.9.49
51	10.9.9.50/32	10.9.9.50 – 10.9.9.50	10.9.9.50
52	10.9.9.51/32	10.9.9.51 – 10.9.9.51	10.9.9.51
53	10.9.9.52/32	10.9.9.52 – 10.9.9.52	10.9.9.52
54	10.9.9.53/32	10.9.9.53 – 10.9.9.53	10.9.9.53
55	10.9.9.54/32	10.9.9.54 – 10.9.9.54	10.9.9.54
56	10.9.9.55/32	10.9.9.55 – 10.9.9.55	10.9.9.55
57	10.9.9.56/32	10.9.9.56 – 10.9.9.56	10.9.9.56
58	10.9.9.57/32	10.9.9.57 – 10.9.9.57	10.9.9.57
59	10.9.9.58/32	10.9.9.58 – 10.9.9.58	10.9.9.58
60	10.9.9.59/32	10.9.9.59 – 10.9.9.59	10.9.9.59
61	10.9.9.60/32	10.9.9.60 – 10.9.9.60	10.9.9.60
62	10.9.9.61/32	10.9.9.61 – 10.9.9.61	10.9.9.61
63	10.9.9.62/32	10.9.9.62 – 10.9.9.62	10.9.9.62
64	10.9.9.63/32	10.9.9.63 – 10.9.9.63	10.9.9.63
65	10.9.9.64/32	10.9.9.64 – 10.9.9.64	10.9.9.64
66	10.9.9.65/32	10.9.9.65 – 10.9.9.65	10.9.9.65
67	10.9.9.66/32	10.9.9.66 – 10.9.9.66	10.9.9.66
68	10.9.9.67/32	10.9.9.67 – 10.9.9.67	10.9.9.67
69	10.9.9.68/32	10.9.9.68 – 10.9.9.68	10.9.9.68
70	10.9.9.69/32	10.9.9.69 – 10.9.9.69	10.9.9.69
71	10.9.9.70/32	10.9.9.70 – 10.9.9.70	10.9.9.70
72	10.9.9.71/32	10.9.9.71 – 10.9.9.71	10.9.9.71
73	10.9.9.72/32	10.9.9.72 – 10.9.9.72	10.9.9.72
74	10.9.9.73/32	10.9.9.73 – 10.9.9.73	10.9.9.73
75	10.9.9.74/32	10.9.9.74 – 10.9.9.74	10.9.9.74
76	10.9.9.75/32	10.9.9.75 – 10.9.9.75	10.9.9.75
77	10.9.9.76/32	10.9.9.76 – 10.9.9.76	10.9.9.76
78	10.9.9.77/32	10.9.9.77 – 10.9.9.77	10.9.9.77
79	10.9.9.78/32	10.9.9.78 – 10.9.9.78	10.9.9.78
80	10.9.9.79/32	10.9.9.79 – 10.9.9.79	10.9.9.79
81	10.9.9.80/32	10.9.9.80 – 10.9.9.80	10.9.9.80
82	10.9.9.81/32	10.9.9.81 – 10.9.9.81	10.9.9.81
83	10.9.9.82/32	10.9.9.82 – 10.9.9.82	10.9.9.82
84	10.9.9.83/32	10.9.9.83 – 10.9.9.83	10.9.9.83
85	10.9.9.84/32	10.9.9.84 – 10.9.9.84	10.9.9.84
86	10.9.9.85/32	10.9.9.85 – 10.9.9.85	10.9.9.85
87	10.9.9.86/32	10.9.9.86 – 10.9.9.86	10.9.9.86
88	10.9.9.87/32	10.9.9.87 – 10.9.9.87	10.9.9.87
89	10.9.9.88/32	10.9.9.88 – 10.9.9.88	10.9.9.88
90	10.9.9.89/32	10.9.9.89 – 10.9.9.89	10.9.9.89
91	10.9.9.90/32	10.9.9.90 – 10.9.9.90	10.9.9.90
92	10.9.9.91/32	10.9.9.91 – 10.9.9.91	10.9.9.91
93	10.9.9.92/32	10.9.9.92 – 10.9.9.92	10.9.9.92
94	10.9.9.93/32	10.9.9.93 – 10.9.9.93	10.9.9.93
95	10.9.9.94/32	10.9.9.94 – 10.9.9.94	10.9.9.94
96	10.9.9.95/32	10.9.9.95 – 10.9.9.95	10.9.9.95
97	10.9.9.96/32	10.9.9.96 – 10.9.9.96	10.9.9.96
98	10.9.9.97/32	10.9.9.97 – 10.9.9.97	10.9.9.97
99	10.9.9.98/32	10.9.9.98 – 10.9.9.98	10.9.9.98
100	10.9.9.99/32	10.9.9.99 – 10.9.9.99	10.9.9.99
101	10.9.9.100/32	10.9.9.100 – 10.9.9.100	10.9.9.100
102	10.9.9.101/32	10.9.9.101 – 10.9.9.101	10.9.9.101
103	10.9.9.102/32	10.9.9.102 – 10.9.9.102	10.9.9.102
104	10.9.9.103/32	10.9.9.103 – 10.9.9.103	10.9.9.103
105	10.9.9.104/32	10.9.9.104 – 10.9.9.104	10.9.9.104
106	10.9.9.105/32	10.9.9.105 – 10.9.9.105	10.9.9.105
107	10.9.9.106/32	10.9.9.106 – 10.9.9.106	10.9.9.106
108	10.9.9.107/32	10.9.9.107 – 10.9.9.107	10.9.9.107
109	10.9.9.108/32	10.9.9.108 – 10.9.9.108	10.9.9.108
110	10.9.9.109/32	10.9.9.109 – 10.9.9.109	10.9.9.109
111	10.9.9.110/32	10.9.9.110 – 10.9.9.110	10.9.9.110
112	10.9.9.111/32	10.9.9.111 – 10.9.9.111	10.9.9.111
113	10.9.9.112/32	10.9.9.112 – 10.9.9.112	10.9.9.112
114	10.9.9.113/32	10.9.9.113 – 10.9.9.113	10.9.9.113
115	10.9.9.114/32	10.9.9.114 – 10.9.9.114	10.9.9.114
116	10.9.9.115/32	10.9.9.115 – 10.9.9.115	10.9.9.115
117	10.9.9.116/32	10.9.9.116 – 10.9.9.116	10.9.9.116
118	10.9.9.117/32	10.9.9.117 – 10.9.9.117	10.9.9.117
119	10.9.9.118/32	10.9.9.118 – 10.9.9.118	10.9.9.118
120	10.9.9.119/32	10.9.9.119 – 10.9.9.119	10.9.9.119
121	10.9.9.120/32	10.9.9.120 – 10.9.9.120	10.9.9.120
122	10.9.9.121/32	10.9.9.121 – 10.9.9.121	10.9.9.121
123	10.9.9.122/32	10.9.9.122 – 10.9.9.122	10.9.9.122
124	10.9.9.123/32	10.9.9.123 – 10.9.9.123	10.9.9.123
125	10.9.9.124/32	10.9.9.124 – 10.9.9.124	10.9.9.124
126	10.9.9.125/32	10.9.9.125 – 10.9.9.125	10.9.9.125
127	10.9.9.126/32	10.9.9.126 – 10.9.9.126	10.9.9.126
128	10.9.9.127/32	10.9.9.127 – 10.9.9.127	10.9.9.127

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 →