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)10.167.209.0/25

network10.167.209.0/25

broadcast10.167.209.127

first host10.167.209.1

last host10.167.209.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.209.0/25

address00001010.10100111.11010001.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.11010001.00000000

broadcast00001010.10100111.11010001.01111111

green = network part, grey = host part

hex0x0aa7d100

decimal178770176

reverse dns0.209.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:d100

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.209.0/32	10.167.209.0 – 10.167.209.0	10.167.209.0
2	10.167.209.1/32	10.167.209.1 – 10.167.209.1	10.167.209.1
3	10.167.209.2/32	10.167.209.2 – 10.167.209.2	10.167.209.2
4	10.167.209.3/32	10.167.209.3 – 10.167.209.3	10.167.209.3
5	10.167.209.4/32	10.167.209.4 – 10.167.209.4	10.167.209.4
6	10.167.209.5/32	10.167.209.5 – 10.167.209.5	10.167.209.5
7	10.167.209.6/32	10.167.209.6 – 10.167.209.6	10.167.209.6
8	10.167.209.7/32	10.167.209.7 – 10.167.209.7	10.167.209.7
9	10.167.209.8/32	10.167.209.8 – 10.167.209.8	10.167.209.8
10	10.167.209.9/32	10.167.209.9 – 10.167.209.9	10.167.209.9
11	10.167.209.10/32	10.167.209.10 – 10.167.209.10	10.167.209.10
12	10.167.209.11/32	10.167.209.11 – 10.167.209.11	10.167.209.11
13	10.167.209.12/32	10.167.209.12 – 10.167.209.12	10.167.209.12
14	10.167.209.13/32	10.167.209.13 – 10.167.209.13	10.167.209.13
15	10.167.209.14/32	10.167.209.14 – 10.167.209.14	10.167.209.14
16	10.167.209.15/32	10.167.209.15 – 10.167.209.15	10.167.209.15
17	10.167.209.16/32	10.167.209.16 – 10.167.209.16	10.167.209.16
18	10.167.209.17/32	10.167.209.17 – 10.167.209.17	10.167.209.17
19	10.167.209.18/32	10.167.209.18 – 10.167.209.18	10.167.209.18
20	10.167.209.19/32	10.167.209.19 – 10.167.209.19	10.167.209.19
21	10.167.209.20/32	10.167.209.20 – 10.167.209.20	10.167.209.20
22	10.167.209.21/32	10.167.209.21 – 10.167.209.21	10.167.209.21
23	10.167.209.22/32	10.167.209.22 – 10.167.209.22	10.167.209.22
24	10.167.209.23/32	10.167.209.23 – 10.167.209.23	10.167.209.23
25	10.167.209.24/32	10.167.209.24 – 10.167.209.24	10.167.209.24
26	10.167.209.25/32	10.167.209.25 – 10.167.209.25	10.167.209.25
27	10.167.209.26/32	10.167.209.26 – 10.167.209.26	10.167.209.26
28	10.167.209.27/32	10.167.209.27 – 10.167.209.27	10.167.209.27
29	10.167.209.28/32	10.167.209.28 – 10.167.209.28	10.167.209.28
30	10.167.209.29/32	10.167.209.29 – 10.167.209.29	10.167.209.29
31	10.167.209.30/32	10.167.209.30 – 10.167.209.30	10.167.209.30
32	10.167.209.31/32	10.167.209.31 – 10.167.209.31	10.167.209.31
33	10.167.209.32/32	10.167.209.32 – 10.167.209.32	10.167.209.32
34	10.167.209.33/32	10.167.209.33 – 10.167.209.33	10.167.209.33
35	10.167.209.34/32	10.167.209.34 – 10.167.209.34	10.167.209.34
36	10.167.209.35/32	10.167.209.35 – 10.167.209.35	10.167.209.35
37	10.167.209.36/32	10.167.209.36 – 10.167.209.36	10.167.209.36
38	10.167.209.37/32	10.167.209.37 – 10.167.209.37	10.167.209.37
39	10.167.209.38/32	10.167.209.38 – 10.167.209.38	10.167.209.38
40	10.167.209.39/32	10.167.209.39 – 10.167.209.39	10.167.209.39
41	10.167.209.40/32	10.167.209.40 – 10.167.209.40	10.167.209.40
42	10.167.209.41/32	10.167.209.41 – 10.167.209.41	10.167.209.41
43	10.167.209.42/32	10.167.209.42 – 10.167.209.42	10.167.209.42
44	10.167.209.43/32	10.167.209.43 – 10.167.209.43	10.167.209.43
45	10.167.209.44/32	10.167.209.44 – 10.167.209.44	10.167.209.44
46	10.167.209.45/32	10.167.209.45 – 10.167.209.45	10.167.209.45
47	10.167.209.46/32	10.167.209.46 – 10.167.209.46	10.167.209.46
48	10.167.209.47/32	10.167.209.47 – 10.167.209.47	10.167.209.47
49	10.167.209.48/32	10.167.209.48 – 10.167.209.48	10.167.209.48
50	10.167.209.49/32	10.167.209.49 – 10.167.209.49	10.167.209.49
51	10.167.209.50/32	10.167.209.50 – 10.167.209.50	10.167.209.50
52	10.167.209.51/32	10.167.209.51 – 10.167.209.51	10.167.209.51
53	10.167.209.52/32	10.167.209.52 – 10.167.209.52	10.167.209.52
54	10.167.209.53/32	10.167.209.53 – 10.167.209.53	10.167.209.53
55	10.167.209.54/32	10.167.209.54 – 10.167.209.54	10.167.209.54
56	10.167.209.55/32	10.167.209.55 – 10.167.209.55	10.167.209.55
57	10.167.209.56/32	10.167.209.56 – 10.167.209.56	10.167.209.56
58	10.167.209.57/32	10.167.209.57 – 10.167.209.57	10.167.209.57
59	10.167.209.58/32	10.167.209.58 – 10.167.209.58	10.167.209.58
60	10.167.209.59/32	10.167.209.59 – 10.167.209.59	10.167.209.59
61	10.167.209.60/32	10.167.209.60 – 10.167.209.60	10.167.209.60
62	10.167.209.61/32	10.167.209.61 – 10.167.209.61	10.167.209.61
63	10.167.209.62/32	10.167.209.62 – 10.167.209.62	10.167.209.62
64	10.167.209.63/32	10.167.209.63 – 10.167.209.63	10.167.209.63
65	10.167.209.64/32	10.167.209.64 – 10.167.209.64	10.167.209.64
66	10.167.209.65/32	10.167.209.65 – 10.167.209.65	10.167.209.65
67	10.167.209.66/32	10.167.209.66 – 10.167.209.66	10.167.209.66
68	10.167.209.67/32	10.167.209.67 – 10.167.209.67	10.167.209.67
69	10.167.209.68/32	10.167.209.68 – 10.167.209.68	10.167.209.68
70	10.167.209.69/32	10.167.209.69 – 10.167.209.69	10.167.209.69
71	10.167.209.70/32	10.167.209.70 – 10.167.209.70	10.167.209.70
72	10.167.209.71/32	10.167.209.71 – 10.167.209.71	10.167.209.71
73	10.167.209.72/32	10.167.209.72 – 10.167.209.72	10.167.209.72
74	10.167.209.73/32	10.167.209.73 – 10.167.209.73	10.167.209.73
75	10.167.209.74/32	10.167.209.74 – 10.167.209.74	10.167.209.74
76	10.167.209.75/32	10.167.209.75 – 10.167.209.75	10.167.209.75
77	10.167.209.76/32	10.167.209.76 – 10.167.209.76	10.167.209.76
78	10.167.209.77/32	10.167.209.77 – 10.167.209.77	10.167.209.77
79	10.167.209.78/32	10.167.209.78 – 10.167.209.78	10.167.209.78
80	10.167.209.79/32	10.167.209.79 – 10.167.209.79	10.167.209.79
81	10.167.209.80/32	10.167.209.80 – 10.167.209.80	10.167.209.80
82	10.167.209.81/32	10.167.209.81 – 10.167.209.81	10.167.209.81
83	10.167.209.82/32	10.167.209.82 – 10.167.209.82	10.167.209.82
84	10.167.209.83/32	10.167.209.83 – 10.167.209.83	10.167.209.83
85	10.167.209.84/32	10.167.209.84 – 10.167.209.84	10.167.209.84
86	10.167.209.85/32	10.167.209.85 – 10.167.209.85	10.167.209.85
87	10.167.209.86/32	10.167.209.86 – 10.167.209.86	10.167.209.86
88	10.167.209.87/32	10.167.209.87 – 10.167.209.87	10.167.209.87
89	10.167.209.88/32	10.167.209.88 – 10.167.209.88	10.167.209.88
90	10.167.209.89/32	10.167.209.89 – 10.167.209.89	10.167.209.89
91	10.167.209.90/32	10.167.209.90 – 10.167.209.90	10.167.209.90
92	10.167.209.91/32	10.167.209.91 – 10.167.209.91	10.167.209.91
93	10.167.209.92/32	10.167.209.92 – 10.167.209.92	10.167.209.92
94	10.167.209.93/32	10.167.209.93 – 10.167.209.93	10.167.209.93
95	10.167.209.94/32	10.167.209.94 – 10.167.209.94	10.167.209.94
96	10.167.209.95/32	10.167.209.95 – 10.167.209.95	10.167.209.95
97	10.167.209.96/32	10.167.209.96 – 10.167.209.96	10.167.209.96
98	10.167.209.97/32	10.167.209.97 – 10.167.209.97	10.167.209.97
99	10.167.209.98/32	10.167.209.98 – 10.167.209.98	10.167.209.98
100	10.167.209.99/32	10.167.209.99 – 10.167.209.99	10.167.209.99
101	10.167.209.100/32	10.167.209.100 – 10.167.209.100	10.167.209.100
102	10.167.209.101/32	10.167.209.101 – 10.167.209.101	10.167.209.101
103	10.167.209.102/32	10.167.209.102 – 10.167.209.102	10.167.209.102
104	10.167.209.103/32	10.167.209.103 – 10.167.209.103	10.167.209.103
105	10.167.209.104/32	10.167.209.104 – 10.167.209.104	10.167.209.104
106	10.167.209.105/32	10.167.209.105 – 10.167.209.105	10.167.209.105
107	10.167.209.106/32	10.167.209.106 – 10.167.209.106	10.167.209.106
108	10.167.209.107/32	10.167.209.107 – 10.167.209.107	10.167.209.107
109	10.167.209.108/32	10.167.209.108 – 10.167.209.108	10.167.209.108
110	10.167.209.109/32	10.167.209.109 – 10.167.209.109	10.167.209.109
111	10.167.209.110/32	10.167.209.110 – 10.167.209.110	10.167.209.110
112	10.167.209.111/32	10.167.209.111 – 10.167.209.111	10.167.209.111
113	10.167.209.112/32	10.167.209.112 – 10.167.209.112	10.167.209.112
114	10.167.209.113/32	10.167.209.113 – 10.167.209.113	10.167.209.113
115	10.167.209.114/32	10.167.209.114 – 10.167.209.114	10.167.209.114
116	10.167.209.115/32	10.167.209.115 – 10.167.209.115	10.167.209.115
117	10.167.209.116/32	10.167.209.116 – 10.167.209.116	10.167.209.116
118	10.167.209.117/32	10.167.209.117 – 10.167.209.117	10.167.209.117
119	10.167.209.118/32	10.167.209.118 – 10.167.209.118	10.167.209.118
120	10.167.209.119/32	10.167.209.119 – 10.167.209.119	10.167.209.119
121	10.167.209.120/32	10.167.209.120 – 10.167.209.120	10.167.209.120
122	10.167.209.121/32	10.167.209.121 – 10.167.209.121	10.167.209.121
123	10.167.209.122/32	10.167.209.122 – 10.167.209.122	10.167.209.122
124	10.167.209.123/32	10.167.209.123 – 10.167.209.123	10.167.209.123
125	10.167.209.124/32	10.167.209.124 – 10.167.209.124	10.167.209.124
126	10.167.209.125/32	10.167.209.125 – 10.167.209.125	10.167.209.125
127	10.167.209.126/32	10.167.209.126 – 10.167.209.126	10.167.209.126
128	10.167.209.127/32	10.167.209.127 – 10.167.209.127	10.167.209.127

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 →