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)10.167.238.0/25

network10.167.238.0/25

broadcast10.167.238.127

first host10.167.238.1

last host10.167.238.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.238.0/25

address00001010.10100111.11101110.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.11101110.00000000

broadcast00001010.10100111.11101110.01111111

green = network part, grey = host part

hex0x0aa7ee00

decimal178777600

reverse dns0.238.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:ee00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.238.0/32	10.167.238.0 – 10.167.238.0	10.167.238.0
2	10.167.238.1/32	10.167.238.1 – 10.167.238.1	10.167.238.1
3	10.167.238.2/32	10.167.238.2 – 10.167.238.2	10.167.238.2
4	10.167.238.3/32	10.167.238.3 – 10.167.238.3	10.167.238.3
5	10.167.238.4/32	10.167.238.4 – 10.167.238.4	10.167.238.4
6	10.167.238.5/32	10.167.238.5 – 10.167.238.5	10.167.238.5
7	10.167.238.6/32	10.167.238.6 – 10.167.238.6	10.167.238.6
8	10.167.238.7/32	10.167.238.7 – 10.167.238.7	10.167.238.7
9	10.167.238.8/32	10.167.238.8 – 10.167.238.8	10.167.238.8
10	10.167.238.9/32	10.167.238.9 – 10.167.238.9	10.167.238.9
11	10.167.238.10/32	10.167.238.10 – 10.167.238.10	10.167.238.10
12	10.167.238.11/32	10.167.238.11 – 10.167.238.11	10.167.238.11
13	10.167.238.12/32	10.167.238.12 – 10.167.238.12	10.167.238.12
14	10.167.238.13/32	10.167.238.13 – 10.167.238.13	10.167.238.13
15	10.167.238.14/32	10.167.238.14 – 10.167.238.14	10.167.238.14
16	10.167.238.15/32	10.167.238.15 – 10.167.238.15	10.167.238.15
17	10.167.238.16/32	10.167.238.16 – 10.167.238.16	10.167.238.16
18	10.167.238.17/32	10.167.238.17 – 10.167.238.17	10.167.238.17
19	10.167.238.18/32	10.167.238.18 – 10.167.238.18	10.167.238.18
20	10.167.238.19/32	10.167.238.19 – 10.167.238.19	10.167.238.19
21	10.167.238.20/32	10.167.238.20 – 10.167.238.20	10.167.238.20
22	10.167.238.21/32	10.167.238.21 – 10.167.238.21	10.167.238.21
23	10.167.238.22/32	10.167.238.22 – 10.167.238.22	10.167.238.22
24	10.167.238.23/32	10.167.238.23 – 10.167.238.23	10.167.238.23
25	10.167.238.24/32	10.167.238.24 – 10.167.238.24	10.167.238.24
26	10.167.238.25/32	10.167.238.25 – 10.167.238.25	10.167.238.25
27	10.167.238.26/32	10.167.238.26 – 10.167.238.26	10.167.238.26
28	10.167.238.27/32	10.167.238.27 – 10.167.238.27	10.167.238.27
29	10.167.238.28/32	10.167.238.28 – 10.167.238.28	10.167.238.28
30	10.167.238.29/32	10.167.238.29 – 10.167.238.29	10.167.238.29
31	10.167.238.30/32	10.167.238.30 – 10.167.238.30	10.167.238.30
32	10.167.238.31/32	10.167.238.31 – 10.167.238.31	10.167.238.31
33	10.167.238.32/32	10.167.238.32 – 10.167.238.32	10.167.238.32
34	10.167.238.33/32	10.167.238.33 – 10.167.238.33	10.167.238.33
35	10.167.238.34/32	10.167.238.34 – 10.167.238.34	10.167.238.34
36	10.167.238.35/32	10.167.238.35 – 10.167.238.35	10.167.238.35
37	10.167.238.36/32	10.167.238.36 – 10.167.238.36	10.167.238.36
38	10.167.238.37/32	10.167.238.37 – 10.167.238.37	10.167.238.37
39	10.167.238.38/32	10.167.238.38 – 10.167.238.38	10.167.238.38
40	10.167.238.39/32	10.167.238.39 – 10.167.238.39	10.167.238.39
41	10.167.238.40/32	10.167.238.40 – 10.167.238.40	10.167.238.40
42	10.167.238.41/32	10.167.238.41 – 10.167.238.41	10.167.238.41
43	10.167.238.42/32	10.167.238.42 – 10.167.238.42	10.167.238.42
44	10.167.238.43/32	10.167.238.43 – 10.167.238.43	10.167.238.43
45	10.167.238.44/32	10.167.238.44 – 10.167.238.44	10.167.238.44
46	10.167.238.45/32	10.167.238.45 – 10.167.238.45	10.167.238.45
47	10.167.238.46/32	10.167.238.46 – 10.167.238.46	10.167.238.46
48	10.167.238.47/32	10.167.238.47 – 10.167.238.47	10.167.238.47
49	10.167.238.48/32	10.167.238.48 – 10.167.238.48	10.167.238.48
50	10.167.238.49/32	10.167.238.49 – 10.167.238.49	10.167.238.49
51	10.167.238.50/32	10.167.238.50 – 10.167.238.50	10.167.238.50
52	10.167.238.51/32	10.167.238.51 – 10.167.238.51	10.167.238.51
53	10.167.238.52/32	10.167.238.52 – 10.167.238.52	10.167.238.52
54	10.167.238.53/32	10.167.238.53 – 10.167.238.53	10.167.238.53
55	10.167.238.54/32	10.167.238.54 – 10.167.238.54	10.167.238.54
56	10.167.238.55/32	10.167.238.55 – 10.167.238.55	10.167.238.55
57	10.167.238.56/32	10.167.238.56 – 10.167.238.56	10.167.238.56
58	10.167.238.57/32	10.167.238.57 – 10.167.238.57	10.167.238.57
59	10.167.238.58/32	10.167.238.58 – 10.167.238.58	10.167.238.58
60	10.167.238.59/32	10.167.238.59 – 10.167.238.59	10.167.238.59
61	10.167.238.60/32	10.167.238.60 – 10.167.238.60	10.167.238.60
62	10.167.238.61/32	10.167.238.61 – 10.167.238.61	10.167.238.61
63	10.167.238.62/32	10.167.238.62 – 10.167.238.62	10.167.238.62
64	10.167.238.63/32	10.167.238.63 – 10.167.238.63	10.167.238.63
65	10.167.238.64/32	10.167.238.64 – 10.167.238.64	10.167.238.64
66	10.167.238.65/32	10.167.238.65 – 10.167.238.65	10.167.238.65
67	10.167.238.66/32	10.167.238.66 – 10.167.238.66	10.167.238.66
68	10.167.238.67/32	10.167.238.67 – 10.167.238.67	10.167.238.67
69	10.167.238.68/32	10.167.238.68 – 10.167.238.68	10.167.238.68
70	10.167.238.69/32	10.167.238.69 – 10.167.238.69	10.167.238.69
71	10.167.238.70/32	10.167.238.70 – 10.167.238.70	10.167.238.70
72	10.167.238.71/32	10.167.238.71 – 10.167.238.71	10.167.238.71
73	10.167.238.72/32	10.167.238.72 – 10.167.238.72	10.167.238.72
74	10.167.238.73/32	10.167.238.73 – 10.167.238.73	10.167.238.73
75	10.167.238.74/32	10.167.238.74 – 10.167.238.74	10.167.238.74
76	10.167.238.75/32	10.167.238.75 – 10.167.238.75	10.167.238.75
77	10.167.238.76/32	10.167.238.76 – 10.167.238.76	10.167.238.76
78	10.167.238.77/32	10.167.238.77 – 10.167.238.77	10.167.238.77
79	10.167.238.78/32	10.167.238.78 – 10.167.238.78	10.167.238.78
80	10.167.238.79/32	10.167.238.79 – 10.167.238.79	10.167.238.79
81	10.167.238.80/32	10.167.238.80 – 10.167.238.80	10.167.238.80
82	10.167.238.81/32	10.167.238.81 – 10.167.238.81	10.167.238.81
83	10.167.238.82/32	10.167.238.82 – 10.167.238.82	10.167.238.82
84	10.167.238.83/32	10.167.238.83 – 10.167.238.83	10.167.238.83
85	10.167.238.84/32	10.167.238.84 – 10.167.238.84	10.167.238.84
86	10.167.238.85/32	10.167.238.85 – 10.167.238.85	10.167.238.85
87	10.167.238.86/32	10.167.238.86 – 10.167.238.86	10.167.238.86
88	10.167.238.87/32	10.167.238.87 – 10.167.238.87	10.167.238.87
89	10.167.238.88/32	10.167.238.88 – 10.167.238.88	10.167.238.88
90	10.167.238.89/32	10.167.238.89 – 10.167.238.89	10.167.238.89
91	10.167.238.90/32	10.167.238.90 – 10.167.238.90	10.167.238.90
92	10.167.238.91/32	10.167.238.91 – 10.167.238.91	10.167.238.91
93	10.167.238.92/32	10.167.238.92 – 10.167.238.92	10.167.238.92
94	10.167.238.93/32	10.167.238.93 – 10.167.238.93	10.167.238.93
95	10.167.238.94/32	10.167.238.94 – 10.167.238.94	10.167.238.94
96	10.167.238.95/32	10.167.238.95 – 10.167.238.95	10.167.238.95
97	10.167.238.96/32	10.167.238.96 – 10.167.238.96	10.167.238.96
98	10.167.238.97/32	10.167.238.97 – 10.167.238.97	10.167.238.97
99	10.167.238.98/32	10.167.238.98 – 10.167.238.98	10.167.238.98
100	10.167.238.99/32	10.167.238.99 – 10.167.238.99	10.167.238.99
101	10.167.238.100/32	10.167.238.100 – 10.167.238.100	10.167.238.100
102	10.167.238.101/32	10.167.238.101 – 10.167.238.101	10.167.238.101
103	10.167.238.102/32	10.167.238.102 – 10.167.238.102	10.167.238.102
104	10.167.238.103/32	10.167.238.103 – 10.167.238.103	10.167.238.103
105	10.167.238.104/32	10.167.238.104 – 10.167.238.104	10.167.238.104
106	10.167.238.105/32	10.167.238.105 – 10.167.238.105	10.167.238.105
107	10.167.238.106/32	10.167.238.106 – 10.167.238.106	10.167.238.106
108	10.167.238.107/32	10.167.238.107 – 10.167.238.107	10.167.238.107
109	10.167.238.108/32	10.167.238.108 – 10.167.238.108	10.167.238.108
110	10.167.238.109/32	10.167.238.109 – 10.167.238.109	10.167.238.109
111	10.167.238.110/32	10.167.238.110 – 10.167.238.110	10.167.238.110
112	10.167.238.111/32	10.167.238.111 – 10.167.238.111	10.167.238.111
113	10.167.238.112/32	10.167.238.112 – 10.167.238.112	10.167.238.112
114	10.167.238.113/32	10.167.238.113 – 10.167.238.113	10.167.238.113
115	10.167.238.114/32	10.167.238.114 – 10.167.238.114	10.167.238.114
116	10.167.238.115/32	10.167.238.115 – 10.167.238.115	10.167.238.115
117	10.167.238.116/32	10.167.238.116 – 10.167.238.116	10.167.238.116
118	10.167.238.117/32	10.167.238.117 – 10.167.238.117	10.167.238.117
119	10.167.238.118/32	10.167.238.118 – 10.167.238.118	10.167.238.118
120	10.167.238.119/32	10.167.238.119 – 10.167.238.119	10.167.238.119
121	10.167.238.120/32	10.167.238.120 – 10.167.238.120	10.167.238.120
122	10.167.238.121/32	10.167.238.121 – 10.167.238.121	10.167.238.121
123	10.167.238.122/32	10.167.238.122 – 10.167.238.122	10.167.238.122
124	10.167.238.123/32	10.167.238.123 – 10.167.238.123	10.167.238.123
125	10.167.238.124/32	10.167.238.124 – 10.167.238.124	10.167.238.124
126	10.167.238.125/32	10.167.238.125 – 10.167.238.125	10.167.238.125
127	10.167.238.126/32	10.167.238.126 – 10.167.238.126	10.167.238.126
128	10.167.238.127/32	10.167.238.127 – 10.167.238.127	10.167.238.127

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 →