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)10.167.172.0/25

network10.167.172.0/25

broadcast10.167.172.127

first host10.167.172.1

last host10.167.172.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.172.0/25

address00001010.10100111.10101100.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.10101100.00000000

broadcast00001010.10100111.10101100.01111111

green = network part, grey = host part

hex0x0aa7ac00

decimal178760704

reverse dns0.172.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:ac00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.172.0/32	10.167.172.0 – 10.167.172.0	10.167.172.0
2	10.167.172.1/32	10.167.172.1 – 10.167.172.1	10.167.172.1
3	10.167.172.2/32	10.167.172.2 – 10.167.172.2	10.167.172.2
4	10.167.172.3/32	10.167.172.3 – 10.167.172.3	10.167.172.3
5	10.167.172.4/32	10.167.172.4 – 10.167.172.4	10.167.172.4
6	10.167.172.5/32	10.167.172.5 – 10.167.172.5	10.167.172.5
7	10.167.172.6/32	10.167.172.6 – 10.167.172.6	10.167.172.6
8	10.167.172.7/32	10.167.172.7 – 10.167.172.7	10.167.172.7
9	10.167.172.8/32	10.167.172.8 – 10.167.172.8	10.167.172.8
10	10.167.172.9/32	10.167.172.9 – 10.167.172.9	10.167.172.9
11	10.167.172.10/32	10.167.172.10 – 10.167.172.10	10.167.172.10
12	10.167.172.11/32	10.167.172.11 – 10.167.172.11	10.167.172.11
13	10.167.172.12/32	10.167.172.12 – 10.167.172.12	10.167.172.12
14	10.167.172.13/32	10.167.172.13 – 10.167.172.13	10.167.172.13
15	10.167.172.14/32	10.167.172.14 – 10.167.172.14	10.167.172.14
16	10.167.172.15/32	10.167.172.15 – 10.167.172.15	10.167.172.15
17	10.167.172.16/32	10.167.172.16 – 10.167.172.16	10.167.172.16
18	10.167.172.17/32	10.167.172.17 – 10.167.172.17	10.167.172.17
19	10.167.172.18/32	10.167.172.18 – 10.167.172.18	10.167.172.18
20	10.167.172.19/32	10.167.172.19 – 10.167.172.19	10.167.172.19
21	10.167.172.20/32	10.167.172.20 – 10.167.172.20	10.167.172.20
22	10.167.172.21/32	10.167.172.21 – 10.167.172.21	10.167.172.21
23	10.167.172.22/32	10.167.172.22 – 10.167.172.22	10.167.172.22
24	10.167.172.23/32	10.167.172.23 – 10.167.172.23	10.167.172.23
25	10.167.172.24/32	10.167.172.24 – 10.167.172.24	10.167.172.24
26	10.167.172.25/32	10.167.172.25 – 10.167.172.25	10.167.172.25
27	10.167.172.26/32	10.167.172.26 – 10.167.172.26	10.167.172.26
28	10.167.172.27/32	10.167.172.27 – 10.167.172.27	10.167.172.27
29	10.167.172.28/32	10.167.172.28 – 10.167.172.28	10.167.172.28
30	10.167.172.29/32	10.167.172.29 – 10.167.172.29	10.167.172.29
31	10.167.172.30/32	10.167.172.30 – 10.167.172.30	10.167.172.30
32	10.167.172.31/32	10.167.172.31 – 10.167.172.31	10.167.172.31
33	10.167.172.32/32	10.167.172.32 – 10.167.172.32	10.167.172.32
34	10.167.172.33/32	10.167.172.33 – 10.167.172.33	10.167.172.33
35	10.167.172.34/32	10.167.172.34 – 10.167.172.34	10.167.172.34
36	10.167.172.35/32	10.167.172.35 – 10.167.172.35	10.167.172.35
37	10.167.172.36/32	10.167.172.36 – 10.167.172.36	10.167.172.36
38	10.167.172.37/32	10.167.172.37 – 10.167.172.37	10.167.172.37
39	10.167.172.38/32	10.167.172.38 – 10.167.172.38	10.167.172.38
40	10.167.172.39/32	10.167.172.39 – 10.167.172.39	10.167.172.39
41	10.167.172.40/32	10.167.172.40 – 10.167.172.40	10.167.172.40
42	10.167.172.41/32	10.167.172.41 – 10.167.172.41	10.167.172.41
43	10.167.172.42/32	10.167.172.42 – 10.167.172.42	10.167.172.42
44	10.167.172.43/32	10.167.172.43 – 10.167.172.43	10.167.172.43
45	10.167.172.44/32	10.167.172.44 – 10.167.172.44	10.167.172.44
46	10.167.172.45/32	10.167.172.45 – 10.167.172.45	10.167.172.45
47	10.167.172.46/32	10.167.172.46 – 10.167.172.46	10.167.172.46
48	10.167.172.47/32	10.167.172.47 – 10.167.172.47	10.167.172.47
49	10.167.172.48/32	10.167.172.48 – 10.167.172.48	10.167.172.48
50	10.167.172.49/32	10.167.172.49 – 10.167.172.49	10.167.172.49
51	10.167.172.50/32	10.167.172.50 – 10.167.172.50	10.167.172.50
52	10.167.172.51/32	10.167.172.51 – 10.167.172.51	10.167.172.51
53	10.167.172.52/32	10.167.172.52 – 10.167.172.52	10.167.172.52
54	10.167.172.53/32	10.167.172.53 – 10.167.172.53	10.167.172.53
55	10.167.172.54/32	10.167.172.54 – 10.167.172.54	10.167.172.54
56	10.167.172.55/32	10.167.172.55 – 10.167.172.55	10.167.172.55
57	10.167.172.56/32	10.167.172.56 – 10.167.172.56	10.167.172.56
58	10.167.172.57/32	10.167.172.57 – 10.167.172.57	10.167.172.57
59	10.167.172.58/32	10.167.172.58 – 10.167.172.58	10.167.172.58
60	10.167.172.59/32	10.167.172.59 – 10.167.172.59	10.167.172.59
61	10.167.172.60/32	10.167.172.60 – 10.167.172.60	10.167.172.60
62	10.167.172.61/32	10.167.172.61 – 10.167.172.61	10.167.172.61
63	10.167.172.62/32	10.167.172.62 – 10.167.172.62	10.167.172.62
64	10.167.172.63/32	10.167.172.63 – 10.167.172.63	10.167.172.63
65	10.167.172.64/32	10.167.172.64 – 10.167.172.64	10.167.172.64
66	10.167.172.65/32	10.167.172.65 – 10.167.172.65	10.167.172.65
67	10.167.172.66/32	10.167.172.66 – 10.167.172.66	10.167.172.66
68	10.167.172.67/32	10.167.172.67 – 10.167.172.67	10.167.172.67
69	10.167.172.68/32	10.167.172.68 – 10.167.172.68	10.167.172.68
70	10.167.172.69/32	10.167.172.69 – 10.167.172.69	10.167.172.69
71	10.167.172.70/32	10.167.172.70 – 10.167.172.70	10.167.172.70
72	10.167.172.71/32	10.167.172.71 – 10.167.172.71	10.167.172.71
73	10.167.172.72/32	10.167.172.72 – 10.167.172.72	10.167.172.72
74	10.167.172.73/32	10.167.172.73 – 10.167.172.73	10.167.172.73
75	10.167.172.74/32	10.167.172.74 – 10.167.172.74	10.167.172.74
76	10.167.172.75/32	10.167.172.75 – 10.167.172.75	10.167.172.75
77	10.167.172.76/32	10.167.172.76 – 10.167.172.76	10.167.172.76
78	10.167.172.77/32	10.167.172.77 – 10.167.172.77	10.167.172.77
79	10.167.172.78/32	10.167.172.78 – 10.167.172.78	10.167.172.78
80	10.167.172.79/32	10.167.172.79 – 10.167.172.79	10.167.172.79
81	10.167.172.80/32	10.167.172.80 – 10.167.172.80	10.167.172.80
82	10.167.172.81/32	10.167.172.81 – 10.167.172.81	10.167.172.81
83	10.167.172.82/32	10.167.172.82 – 10.167.172.82	10.167.172.82
84	10.167.172.83/32	10.167.172.83 – 10.167.172.83	10.167.172.83
85	10.167.172.84/32	10.167.172.84 – 10.167.172.84	10.167.172.84
86	10.167.172.85/32	10.167.172.85 – 10.167.172.85	10.167.172.85
87	10.167.172.86/32	10.167.172.86 – 10.167.172.86	10.167.172.86
88	10.167.172.87/32	10.167.172.87 – 10.167.172.87	10.167.172.87
89	10.167.172.88/32	10.167.172.88 – 10.167.172.88	10.167.172.88
90	10.167.172.89/32	10.167.172.89 – 10.167.172.89	10.167.172.89
91	10.167.172.90/32	10.167.172.90 – 10.167.172.90	10.167.172.90
92	10.167.172.91/32	10.167.172.91 – 10.167.172.91	10.167.172.91
93	10.167.172.92/32	10.167.172.92 – 10.167.172.92	10.167.172.92
94	10.167.172.93/32	10.167.172.93 – 10.167.172.93	10.167.172.93
95	10.167.172.94/32	10.167.172.94 – 10.167.172.94	10.167.172.94
96	10.167.172.95/32	10.167.172.95 – 10.167.172.95	10.167.172.95
97	10.167.172.96/32	10.167.172.96 – 10.167.172.96	10.167.172.96
98	10.167.172.97/32	10.167.172.97 – 10.167.172.97	10.167.172.97
99	10.167.172.98/32	10.167.172.98 – 10.167.172.98	10.167.172.98
100	10.167.172.99/32	10.167.172.99 – 10.167.172.99	10.167.172.99
101	10.167.172.100/32	10.167.172.100 – 10.167.172.100	10.167.172.100
102	10.167.172.101/32	10.167.172.101 – 10.167.172.101	10.167.172.101
103	10.167.172.102/32	10.167.172.102 – 10.167.172.102	10.167.172.102
104	10.167.172.103/32	10.167.172.103 – 10.167.172.103	10.167.172.103
105	10.167.172.104/32	10.167.172.104 – 10.167.172.104	10.167.172.104
106	10.167.172.105/32	10.167.172.105 – 10.167.172.105	10.167.172.105
107	10.167.172.106/32	10.167.172.106 – 10.167.172.106	10.167.172.106
108	10.167.172.107/32	10.167.172.107 – 10.167.172.107	10.167.172.107
109	10.167.172.108/32	10.167.172.108 – 10.167.172.108	10.167.172.108
110	10.167.172.109/32	10.167.172.109 – 10.167.172.109	10.167.172.109
111	10.167.172.110/32	10.167.172.110 – 10.167.172.110	10.167.172.110
112	10.167.172.111/32	10.167.172.111 – 10.167.172.111	10.167.172.111
113	10.167.172.112/32	10.167.172.112 – 10.167.172.112	10.167.172.112
114	10.167.172.113/32	10.167.172.113 – 10.167.172.113	10.167.172.113
115	10.167.172.114/32	10.167.172.114 – 10.167.172.114	10.167.172.114
116	10.167.172.115/32	10.167.172.115 – 10.167.172.115	10.167.172.115
117	10.167.172.116/32	10.167.172.116 – 10.167.172.116	10.167.172.116
118	10.167.172.117/32	10.167.172.117 – 10.167.172.117	10.167.172.117
119	10.167.172.118/32	10.167.172.118 – 10.167.172.118	10.167.172.118
120	10.167.172.119/32	10.167.172.119 – 10.167.172.119	10.167.172.119
121	10.167.172.120/32	10.167.172.120 – 10.167.172.120	10.167.172.120
122	10.167.172.121/32	10.167.172.121 – 10.167.172.121	10.167.172.121
123	10.167.172.122/32	10.167.172.122 – 10.167.172.122	10.167.172.122
124	10.167.172.123/32	10.167.172.123 – 10.167.172.123	10.167.172.123
125	10.167.172.124/32	10.167.172.124 – 10.167.172.124	10.167.172.124
126	10.167.172.125/32	10.167.172.125 – 10.167.172.125	10.167.172.125
127	10.167.172.126/32	10.167.172.126 – 10.167.172.126	10.167.172.126
128	10.167.172.127/32	10.167.172.127 – 10.167.172.127	10.167.172.127

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 →