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)10.167.208.0/25

network10.167.208.0/25

broadcast10.167.208.127

first host10.167.208.1

last host10.167.208.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.208.0/25

address00001010.10100111.11010000.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.11010000.00000000

broadcast00001010.10100111.11010000.01111111

green = network part, grey = host part

hex0x0aa7d000

decimal178769920

reverse dns0.208.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:d000

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.208.0/32	10.167.208.0 – 10.167.208.0	10.167.208.0
2	10.167.208.1/32	10.167.208.1 – 10.167.208.1	10.167.208.1
3	10.167.208.2/32	10.167.208.2 – 10.167.208.2	10.167.208.2
4	10.167.208.3/32	10.167.208.3 – 10.167.208.3	10.167.208.3
5	10.167.208.4/32	10.167.208.4 – 10.167.208.4	10.167.208.4
6	10.167.208.5/32	10.167.208.5 – 10.167.208.5	10.167.208.5
7	10.167.208.6/32	10.167.208.6 – 10.167.208.6	10.167.208.6
8	10.167.208.7/32	10.167.208.7 – 10.167.208.7	10.167.208.7
9	10.167.208.8/32	10.167.208.8 – 10.167.208.8	10.167.208.8
10	10.167.208.9/32	10.167.208.9 – 10.167.208.9	10.167.208.9
11	10.167.208.10/32	10.167.208.10 – 10.167.208.10	10.167.208.10
12	10.167.208.11/32	10.167.208.11 – 10.167.208.11	10.167.208.11
13	10.167.208.12/32	10.167.208.12 – 10.167.208.12	10.167.208.12
14	10.167.208.13/32	10.167.208.13 – 10.167.208.13	10.167.208.13
15	10.167.208.14/32	10.167.208.14 – 10.167.208.14	10.167.208.14
16	10.167.208.15/32	10.167.208.15 – 10.167.208.15	10.167.208.15
17	10.167.208.16/32	10.167.208.16 – 10.167.208.16	10.167.208.16
18	10.167.208.17/32	10.167.208.17 – 10.167.208.17	10.167.208.17
19	10.167.208.18/32	10.167.208.18 – 10.167.208.18	10.167.208.18
20	10.167.208.19/32	10.167.208.19 – 10.167.208.19	10.167.208.19
21	10.167.208.20/32	10.167.208.20 – 10.167.208.20	10.167.208.20
22	10.167.208.21/32	10.167.208.21 – 10.167.208.21	10.167.208.21
23	10.167.208.22/32	10.167.208.22 – 10.167.208.22	10.167.208.22
24	10.167.208.23/32	10.167.208.23 – 10.167.208.23	10.167.208.23
25	10.167.208.24/32	10.167.208.24 – 10.167.208.24	10.167.208.24
26	10.167.208.25/32	10.167.208.25 – 10.167.208.25	10.167.208.25
27	10.167.208.26/32	10.167.208.26 – 10.167.208.26	10.167.208.26
28	10.167.208.27/32	10.167.208.27 – 10.167.208.27	10.167.208.27
29	10.167.208.28/32	10.167.208.28 – 10.167.208.28	10.167.208.28
30	10.167.208.29/32	10.167.208.29 – 10.167.208.29	10.167.208.29
31	10.167.208.30/32	10.167.208.30 – 10.167.208.30	10.167.208.30
32	10.167.208.31/32	10.167.208.31 – 10.167.208.31	10.167.208.31
33	10.167.208.32/32	10.167.208.32 – 10.167.208.32	10.167.208.32
34	10.167.208.33/32	10.167.208.33 – 10.167.208.33	10.167.208.33
35	10.167.208.34/32	10.167.208.34 – 10.167.208.34	10.167.208.34
36	10.167.208.35/32	10.167.208.35 – 10.167.208.35	10.167.208.35
37	10.167.208.36/32	10.167.208.36 – 10.167.208.36	10.167.208.36
38	10.167.208.37/32	10.167.208.37 – 10.167.208.37	10.167.208.37
39	10.167.208.38/32	10.167.208.38 – 10.167.208.38	10.167.208.38
40	10.167.208.39/32	10.167.208.39 – 10.167.208.39	10.167.208.39
41	10.167.208.40/32	10.167.208.40 – 10.167.208.40	10.167.208.40
42	10.167.208.41/32	10.167.208.41 – 10.167.208.41	10.167.208.41
43	10.167.208.42/32	10.167.208.42 – 10.167.208.42	10.167.208.42
44	10.167.208.43/32	10.167.208.43 – 10.167.208.43	10.167.208.43
45	10.167.208.44/32	10.167.208.44 – 10.167.208.44	10.167.208.44
46	10.167.208.45/32	10.167.208.45 – 10.167.208.45	10.167.208.45
47	10.167.208.46/32	10.167.208.46 – 10.167.208.46	10.167.208.46
48	10.167.208.47/32	10.167.208.47 – 10.167.208.47	10.167.208.47
49	10.167.208.48/32	10.167.208.48 – 10.167.208.48	10.167.208.48
50	10.167.208.49/32	10.167.208.49 – 10.167.208.49	10.167.208.49
51	10.167.208.50/32	10.167.208.50 – 10.167.208.50	10.167.208.50
52	10.167.208.51/32	10.167.208.51 – 10.167.208.51	10.167.208.51
53	10.167.208.52/32	10.167.208.52 – 10.167.208.52	10.167.208.52
54	10.167.208.53/32	10.167.208.53 – 10.167.208.53	10.167.208.53
55	10.167.208.54/32	10.167.208.54 – 10.167.208.54	10.167.208.54
56	10.167.208.55/32	10.167.208.55 – 10.167.208.55	10.167.208.55
57	10.167.208.56/32	10.167.208.56 – 10.167.208.56	10.167.208.56
58	10.167.208.57/32	10.167.208.57 – 10.167.208.57	10.167.208.57
59	10.167.208.58/32	10.167.208.58 – 10.167.208.58	10.167.208.58
60	10.167.208.59/32	10.167.208.59 – 10.167.208.59	10.167.208.59
61	10.167.208.60/32	10.167.208.60 – 10.167.208.60	10.167.208.60
62	10.167.208.61/32	10.167.208.61 – 10.167.208.61	10.167.208.61
63	10.167.208.62/32	10.167.208.62 – 10.167.208.62	10.167.208.62
64	10.167.208.63/32	10.167.208.63 – 10.167.208.63	10.167.208.63
65	10.167.208.64/32	10.167.208.64 – 10.167.208.64	10.167.208.64
66	10.167.208.65/32	10.167.208.65 – 10.167.208.65	10.167.208.65
67	10.167.208.66/32	10.167.208.66 – 10.167.208.66	10.167.208.66
68	10.167.208.67/32	10.167.208.67 – 10.167.208.67	10.167.208.67
69	10.167.208.68/32	10.167.208.68 – 10.167.208.68	10.167.208.68
70	10.167.208.69/32	10.167.208.69 – 10.167.208.69	10.167.208.69
71	10.167.208.70/32	10.167.208.70 – 10.167.208.70	10.167.208.70
72	10.167.208.71/32	10.167.208.71 – 10.167.208.71	10.167.208.71
73	10.167.208.72/32	10.167.208.72 – 10.167.208.72	10.167.208.72
74	10.167.208.73/32	10.167.208.73 – 10.167.208.73	10.167.208.73
75	10.167.208.74/32	10.167.208.74 – 10.167.208.74	10.167.208.74
76	10.167.208.75/32	10.167.208.75 – 10.167.208.75	10.167.208.75
77	10.167.208.76/32	10.167.208.76 – 10.167.208.76	10.167.208.76
78	10.167.208.77/32	10.167.208.77 – 10.167.208.77	10.167.208.77
79	10.167.208.78/32	10.167.208.78 – 10.167.208.78	10.167.208.78
80	10.167.208.79/32	10.167.208.79 – 10.167.208.79	10.167.208.79
81	10.167.208.80/32	10.167.208.80 – 10.167.208.80	10.167.208.80
82	10.167.208.81/32	10.167.208.81 – 10.167.208.81	10.167.208.81
83	10.167.208.82/32	10.167.208.82 – 10.167.208.82	10.167.208.82
84	10.167.208.83/32	10.167.208.83 – 10.167.208.83	10.167.208.83
85	10.167.208.84/32	10.167.208.84 – 10.167.208.84	10.167.208.84
86	10.167.208.85/32	10.167.208.85 – 10.167.208.85	10.167.208.85
87	10.167.208.86/32	10.167.208.86 – 10.167.208.86	10.167.208.86
88	10.167.208.87/32	10.167.208.87 – 10.167.208.87	10.167.208.87
89	10.167.208.88/32	10.167.208.88 – 10.167.208.88	10.167.208.88
90	10.167.208.89/32	10.167.208.89 – 10.167.208.89	10.167.208.89
91	10.167.208.90/32	10.167.208.90 – 10.167.208.90	10.167.208.90
92	10.167.208.91/32	10.167.208.91 – 10.167.208.91	10.167.208.91
93	10.167.208.92/32	10.167.208.92 – 10.167.208.92	10.167.208.92
94	10.167.208.93/32	10.167.208.93 – 10.167.208.93	10.167.208.93
95	10.167.208.94/32	10.167.208.94 – 10.167.208.94	10.167.208.94
96	10.167.208.95/32	10.167.208.95 – 10.167.208.95	10.167.208.95
97	10.167.208.96/32	10.167.208.96 – 10.167.208.96	10.167.208.96
98	10.167.208.97/32	10.167.208.97 – 10.167.208.97	10.167.208.97
99	10.167.208.98/32	10.167.208.98 – 10.167.208.98	10.167.208.98
100	10.167.208.99/32	10.167.208.99 – 10.167.208.99	10.167.208.99
101	10.167.208.100/32	10.167.208.100 – 10.167.208.100	10.167.208.100
102	10.167.208.101/32	10.167.208.101 – 10.167.208.101	10.167.208.101
103	10.167.208.102/32	10.167.208.102 – 10.167.208.102	10.167.208.102
104	10.167.208.103/32	10.167.208.103 – 10.167.208.103	10.167.208.103
105	10.167.208.104/32	10.167.208.104 – 10.167.208.104	10.167.208.104
106	10.167.208.105/32	10.167.208.105 – 10.167.208.105	10.167.208.105
107	10.167.208.106/32	10.167.208.106 – 10.167.208.106	10.167.208.106
108	10.167.208.107/32	10.167.208.107 – 10.167.208.107	10.167.208.107
109	10.167.208.108/32	10.167.208.108 – 10.167.208.108	10.167.208.108
110	10.167.208.109/32	10.167.208.109 – 10.167.208.109	10.167.208.109
111	10.167.208.110/32	10.167.208.110 – 10.167.208.110	10.167.208.110
112	10.167.208.111/32	10.167.208.111 – 10.167.208.111	10.167.208.111
113	10.167.208.112/32	10.167.208.112 – 10.167.208.112	10.167.208.112
114	10.167.208.113/32	10.167.208.113 – 10.167.208.113	10.167.208.113
115	10.167.208.114/32	10.167.208.114 – 10.167.208.114	10.167.208.114
116	10.167.208.115/32	10.167.208.115 – 10.167.208.115	10.167.208.115
117	10.167.208.116/32	10.167.208.116 – 10.167.208.116	10.167.208.116
118	10.167.208.117/32	10.167.208.117 – 10.167.208.117	10.167.208.117
119	10.167.208.118/32	10.167.208.118 – 10.167.208.118	10.167.208.118
120	10.167.208.119/32	10.167.208.119 – 10.167.208.119	10.167.208.119
121	10.167.208.120/32	10.167.208.120 – 10.167.208.120	10.167.208.120
122	10.167.208.121/32	10.167.208.121 – 10.167.208.121	10.167.208.121
123	10.167.208.122/32	10.167.208.122 – 10.167.208.122	10.167.208.122
124	10.167.208.123/32	10.167.208.123 – 10.167.208.123	10.167.208.123
125	10.167.208.124/32	10.167.208.124 – 10.167.208.124	10.167.208.124
126	10.167.208.125/32	10.167.208.125 – 10.167.208.125	10.167.208.125
127	10.167.208.126/32	10.167.208.126 – 10.167.208.126	10.167.208.126
128	10.167.208.127/32	10.167.208.127 – 10.167.208.127	10.167.208.127

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 →