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)10.167.136.0/25

network10.167.136.0/25

broadcast10.167.136.127

first host10.167.136.1

last host10.167.136.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.136.0/25

address00001010.10100111.10001000.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.10001000.00000000

broadcast00001010.10100111.10001000.01111111

green = network part, grey = host part

hex0x0aa78800

decimal178751488

reverse dns0.136.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:8800

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.136.0/32	10.167.136.0 – 10.167.136.0	10.167.136.0
2	10.167.136.1/32	10.167.136.1 – 10.167.136.1	10.167.136.1
3	10.167.136.2/32	10.167.136.2 – 10.167.136.2	10.167.136.2
4	10.167.136.3/32	10.167.136.3 – 10.167.136.3	10.167.136.3
5	10.167.136.4/32	10.167.136.4 – 10.167.136.4	10.167.136.4
6	10.167.136.5/32	10.167.136.5 – 10.167.136.5	10.167.136.5
7	10.167.136.6/32	10.167.136.6 – 10.167.136.6	10.167.136.6
8	10.167.136.7/32	10.167.136.7 – 10.167.136.7	10.167.136.7
9	10.167.136.8/32	10.167.136.8 – 10.167.136.8	10.167.136.8
10	10.167.136.9/32	10.167.136.9 – 10.167.136.9	10.167.136.9
11	10.167.136.10/32	10.167.136.10 – 10.167.136.10	10.167.136.10
12	10.167.136.11/32	10.167.136.11 – 10.167.136.11	10.167.136.11
13	10.167.136.12/32	10.167.136.12 – 10.167.136.12	10.167.136.12
14	10.167.136.13/32	10.167.136.13 – 10.167.136.13	10.167.136.13
15	10.167.136.14/32	10.167.136.14 – 10.167.136.14	10.167.136.14
16	10.167.136.15/32	10.167.136.15 – 10.167.136.15	10.167.136.15
17	10.167.136.16/32	10.167.136.16 – 10.167.136.16	10.167.136.16
18	10.167.136.17/32	10.167.136.17 – 10.167.136.17	10.167.136.17
19	10.167.136.18/32	10.167.136.18 – 10.167.136.18	10.167.136.18
20	10.167.136.19/32	10.167.136.19 – 10.167.136.19	10.167.136.19
21	10.167.136.20/32	10.167.136.20 – 10.167.136.20	10.167.136.20
22	10.167.136.21/32	10.167.136.21 – 10.167.136.21	10.167.136.21
23	10.167.136.22/32	10.167.136.22 – 10.167.136.22	10.167.136.22
24	10.167.136.23/32	10.167.136.23 – 10.167.136.23	10.167.136.23
25	10.167.136.24/32	10.167.136.24 – 10.167.136.24	10.167.136.24
26	10.167.136.25/32	10.167.136.25 – 10.167.136.25	10.167.136.25
27	10.167.136.26/32	10.167.136.26 – 10.167.136.26	10.167.136.26
28	10.167.136.27/32	10.167.136.27 – 10.167.136.27	10.167.136.27
29	10.167.136.28/32	10.167.136.28 – 10.167.136.28	10.167.136.28
30	10.167.136.29/32	10.167.136.29 – 10.167.136.29	10.167.136.29
31	10.167.136.30/32	10.167.136.30 – 10.167.136.30	10.167.136.30
32	10.167.136.31/32	10.167.136.31 – 10.167.136.31	10.167.136.31
33	10.167.136.32/32	10.167.136.32 – 10.167.136.32	10.167.136.32
34	10.167.136.33/32	10.167.136.33 – 10.167.136.33	10.167.136.33
35	10.167.136.34/32	10.167.136.34 – 10.167.136.34	10.167.136.34
36	10.167.136.35/32	10.167.136.35 – 10.167.136.35	10.167.136.35
37	10.167.136.36/32	10.167.136.36 – 10.167.136.36	10.167.136.36
38	10.167.136.37/32	10.167.136.37 – 10.167.136.37	10.167.136.37
39	10.167.136.38/32	10.167.136.38 – 10.167.136.38	10.167.136.38
40	10.167.136.39/32	10.167.136.39 – 10.167.136.39	10.167.136.39
41	10.167.136.40/32	10.167.136.40 – 10.167.136.40	10.167.136.40
42	10.167.136.41/32	10.167.136.41 – 10.167.136.41	10.167.136.41
43	10.167.136.42/32	10.167.136.42 – 10.167.136.42	10.167.136.42
44	10.167.136.43/32	10.167.136.43 – 10.167.136.43	10.167.136.43
45	10.167.136.44/32	10.167.136.44 – 10.167.136.44	10.167.136.44
46	10.167.136.45/32	10.167.136.45 – 10.167.136.45	10.167.136.45
47	10.167.136.46/32	10.167.136.46 – 10.167.136.46	10.167.136.46
48	10.167.136.47/32	10.167.136.47 – 10.167.136.47	10.167.136.47
49	10.167.136.48/32	10.167.136.48 – 10.167.136.48	10.167.136.48
50	10.167.136.49/32	10.167.136.49 – 10.167.136.49	10.167.136.49
51	10.167.136.50/32	10.167.136.50 – 10.167.136.50	10.167.136.50
52	10.167.136.51/32	10.167.136.51 – 10.167.136.51	10.167.136.51
53	10.167.136.52/32	10.167.136.52 – 10.167.136.52	10.167.136.52
54	10.167.136.53/32	10.167.136.53 – 10.167.136.53	10.167.136.53
55	10.167.136.54/32	10.167.136.54 – 10.167.136.54	10.167.136.54
56	10.167.136.55/32	10.167.136.55 – 10.167.136.55	10.167.136.55
57	10.167.136.56/32	10.167.136.56 – 10.167.136.56	10.167.136.56
58	10.167.136.57/32	10.167.136.57 – 10.167.136.57	10.167.136.57
59	10.167.136.58/32	10.167.136.58 – 10.167.136.58	10.167.136.58
60	10.167.136.59/32	10.167.136.59 – 10.167.136.59	10.167.136.59
61	10.167.136.60/32	10.167.136.60 – 10.167.136.60	10.167.136.60
62	10.167.136.61/32	10.167.136.61 – 10.167.136.61	10.167.136.61
63	10.167.136.62/32	10.167.136.62 – 10.167.136.62	10.167.136.62
64	10.167.136.63/32	10.167.136.63 – 10.167.136.63	10.167.136.63
65	10.167.136.64/32	10.167.136.64 – 10.167.136.64	10.167.136.64
66	10.167.136.65/32	10.167.136.65 – 10.167.136.65	10.167.136.65
67	10.167.136.66/32	10.167.136.66 – 10.167.136.66	10.167.136.66
68	10.167.136.67/32	10.167.136.67 – 10.167.136.67	10.167.136.67
69	10.167.136.68/32	10.167.136.68 – 10.167.136.68	10.167.136.68
70	10.167.136.69/32	10.167.136.69 – 10.167.136.69	10.167.136.69
71	10.167.136.70/32	10.167.136.70 – 10.167.136.70	10.167.136.70
72	10.167.136.71/32	10.167.136.71 – 10.167.136.71	10.167.136.71
73	10.167.136.72/32	10.167.136.72 – 10.167.136.72	10.167.136.72
74	10.167.136.73/32	10.167.136.73 – 10.167.136.73	10.167.136.73
75	10.167.136.74/32	10.167.136.74 – 10.167.136.74	10.167.136.74
76	10.167.136.75/32	10.167.136.75 – 10.167.136.75	10.167.136.75
77	10.167.136.76/32	10.167.136.76 – 10.167.136.76	10.167.136.76
78	10.167.136.77/32	10.167.136.77 – 10.167.136.77	10.167.136.77
79	10.167.136.78/32	10.167.136.78 – 10.167.136.78	10.167.136.78
80	10.167.136.79/32	10.167.136.79 – 10.167.136.79	10.167.136.79
81	10.167.136.80/32	10.167.136.80 – 10.167.136.80	10.167.136.80
82	10.167.136.81/32	10.167.136.81 – 10.167.136.81	10.167.136.81
83	10.167.136.82/32	10.167.136.82 – 10.167.136.82	10.167.136.82
84	10.167.136.83/32	10.167.136.83 – 10.167.136.83	10.167.136.83
85	10.167.136.84/32	10.167.136.84 – 10.167.136.84	10.167.136.84
86	10.167.136.85/32	10.167.136.85 – 10.167.136.85	10.167.136.85
87	10.167.136.86/32	10.167.136.86 – 10.167.136.86	10.167.136.86
88	10.167.136.87/32	10.167.136.87 – 10.167.136.87	10.167.136.87
89	10.167.136.88/32	10.167.136.88 – 10.167.136.88	10.167.136.88
90	10.167.136.89/32	10.167.136.89 – 10.167.136.89	10.167.136.89
91	10.167.136.90/32	10.167.136.90 – 10.167.136.90	10.167.136.90
92	10.167.136.91/32	10.167.136.91 – 10.167.136.91	10.167.136.91
93	10.167.136.92/32	10.167.136.92 – 10.167.136.92	10.167.136.92
94	10.167.136.93/32	10.167.136.93 – 10.167.136.93	10.167.136.93
95	10.167.136.94/32	10.167.136.94 – 10.167.136.94	10.167.136.94
96	10.167.136.95/32	10.167.136.95 – 10.167.136.95	10.167.136.95
97	10.167.136.96/32	10.167.136.96 – 10.167.136.96	10.167.136.96
98	10.167.136.97/32	10.167.136.97 – 10.167.136.97	10.167.136.97
99	10.167.136.98/32	10.167.136.98 – 10.167.136.98	10.167.136.98
100	10.167.136.99/32	10.167.136.99 – 10.167.136.99	10.167.136.99
101	10.167.136.100/32	10.167.136.100 – 10.167.136.100	10.167.136.100
102	10.167.136.101/32	10.167.136.101 – 10.167.136.101	10.167.136.101
103	10.167.136.102/32	10.167.136.102 – 10.167.136.102	10.167.136.102
104	10.167.136.103/32	10.167.136.103 – 10.167.136.103	10.167.136.103
105	10.167.136.104/32	10.167.136.104 – 10.167.136.104	10.167.136.104
106	10.167.136.105/32	10.167.136.105 – 10.167.136.105	10.167.136.105
107	10.167.136.106/32	10.167.136.106 – 10.167.136.106	10.167.136.106
108	10.167.136.107/32	10.167.136.107 – 10.167.136.107	10.167.136.107
109	10.167.136.108/32	10.167.136.108 – 10.167.136.108	10.167.136.108
110	10.167.136.109/32	10.167.136.109 – 10.167.136.109	10.167.136.109
111	10.167.136.110/32	10.167.136.110 – 10.167.136.110	10.167.136.110
112	10.167.136.111/32	10.167.136.111 – 10.167.136.111	10.167.136.111
113	10.167.136.112/32	10.167.136.112 – 10.167.136.112	10.167.136.112
114	10.167.136.113/32	10.167.136.113 – 10.167.136.113	10.167.136.113
115	10.167.136.114/32	10.167.136.114 – 10.167.136.114	10.167.136.114
116	10.167.136.115/32	10.167.136.115 – 10.167.136.115	10.167.136.115
117	10.167.136.116/32	10.167.136.116 – 10.167.136.116	10.167.136.116
118	10.167.136.117/32	10.167.136.117 – 10.167.136.117	10.167.136.117
119	10.167.136.118/32	10.167.136.118 – 10.167.136.118	10.167.136.118
120	10.167.136.119/32	10.167.136.119 – 10.167.136.119	10.167.136.119
121	10.167.136.120/32	10.167.136.120 – 10.167.136.120	10.167.136.120
122	10.167.136.121/32	10.167.136.121 – 10.167.136.121	10.167.136.121
123	10.167.136.122/32	10.167.136.122 – 10.167.136.122	10.167.136.122
124	10.167.136.123/32	10.167.136.123 – 10.167.136.123	10.167.136.123
125	10.167.136.124/32	10.167.136.124 – 10.167.136.124	10.167.136.124
126	10.167.136.125/32	10.167.136.125 – 10.167.136.125	10.167.136.125
127	10.167.136.126/32	10.167.136.126 – 10.167.136.126	10.167.136.126
128	10.167.136.127/32	10.167.136.127 – 10.167.136.127	10.167.136.127

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 →