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)10.167.101.0/25

network10.167.101.0/25

broadcast10.167.101.127

first host10.167.101.1

last host10.167.101.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.101.0/25

address00001010.10100111.01100101.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.01100101.00000000

broadcast00001010.10100111.01100101.01111111

green = network part, grey = host part

hex0x0aa76500

decimal178742528

reverse dns0.101.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:6500

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.101.0/32	10.167.101.0 – 10.167.101.0	10.167.101.0
2	10.167.101.1/32	10.167.101.1 – 10.167.101.1	10.167.101.1
3	10.167.101.2/32	10.167.101.2 – 10.167.101.2	10.167.101.2
4	10.167.101.3/32	10.167.101.3 – 10.167.101.3	10.167.101.3
5	10.167.101.4/32	10.167.101.4 – 10.167.101.4	10.167.101.4
6	10.167.101.5/32	10.167.101.5 – 10.167.101.5	10.167.101.5
7	10.167.101.6/32	10.167.101.6 – 10.167.101.6	10.167.101.6
8	10.167.101.7/32	10.167.101.7 – 10.167.101.7	10.167.101.7
9	10.167.101.8/32	10.167.101.8 – 10.167.101.8	10.167.101.8
10	10.167.101.9/32	10.167.101.9 – 10.167.101.9	10.167.101.9
11	10.167.101.10/32	10.167.101.10 – 10.167.101.10	10.167.101.10
12	10.167.101.11/32	10.167.101.11 – 10.167.101.11	10.167.101.11
13	10.167.101.12/32	10.167.101.12 – 10.167.101.12	10.167.101.12
14	10.167.101.13/32	10.167.101.13 – 10.167.101.13	10.167.101.13
15	10.167.101.14/32	10.167.101.14 – 10.167.101.14	10.167.101.14
16	10.167.101.15/32	10.167.101.15 – 10.167.101.15	10.167.101.15
17	10.167.101.16/32	10.167.101.16 – 10.167.101.16	10.167.101.16
18	10.167.101.17/32	10.167.101.17 – 10.167.101.17	10.167.101.17
19	10.167.101.18/32	10.167.101.18 – 10.167.101.18	10.167.101.18
20	10.167.101.19/32	10.167.101.19 – 10.167.101.19	10.167.101.19
21	10.167.101.20/32	10.167.101.20 – 10.167.101.20	10.167.101.20
22	10.167.101.21/32	10.167.101.21 – 10.167.101.21	10.167.101.21
23	10.167.101.22/32	10.167.101.22 – 10.167.101.22	10.167.101.22
24	10.167.101.23/32	10.167.101.23 – 10.167.101.23	10.167.101.23
25	10.167.101.24/32	10.167.101.24 – 10.167.101.24	10.167.101.24
26	10.167.101.25/32	10.167.101.25 – 10.167.101.25	10.167.101.25
27	10.167.101.26/32	10.167.101.26 – 10.167.101.26	10.167.101.26
28	10.167.101.27/32	10.167.101.27 – 10.167.101.27	10.167.101.27
29	10.167.101.28/32	10.167.101.28 – 10.167.101.28	10.167.101.28
30	10.167.101.29/32	10.167.101.29 – 10.167.101.29	10.167.101.29
31	10.167.101.30/32	10.167.101.30 – 10.167.101.30	10.167.101.30
32	10.167.101.31/32	10.167.101.31 – 10.167.101.31	10.167.101.31
33	10.167.101.32/32	10.167.101.32 – 10.167.101.32	10.167.101.32
34	10.167.101.33/32	10.167.101.33 – 10.167.101.33	10.167.101.33
35	10.167.101.34/32	10.167.101.34 – 10.167.101.34	10.167.101.34
36	10.167.101.35/32	10.167.101.35 – 10.167.101.35	10.167.101.35
37	10.167.101.36/32	10.167.101.36 – 10.167.101.36	10.167.101.36
38	10.167.101.37/32	10.167.101.37 – 10.167.101.37	10.167.101.37
39	10.167.101.38/32	10.167.101.38 – 10.167.101.38	10.167.101.38
40	10.167.101.39/32	10.167.101.39 – 10.167.101.39	10.167.101.39
41	10.167.101.40/32	10.167.101.40 – 10.167.101.40	10.167.101.40
42	10.167.101.41/32	10.167.101.41 – 10.167.101.41	10.167.101.41
43	10.167.101.42/32	10.167.101.42 – 10.167.101.42	10.167.101.42
44	10.167.101.43/32	10.167.101.43 – 10.167.101.43	10.167.101.43
45	10.167.101.44/32	10.167.101.44 – 10.167.101.44	10.167.101.44
46	10.167.101.45/32	10.167.101.45 – 10.167.101.45	10.167.101.45
47	10.167.101.46/32	10.167.101.46 – 10.167.101.46	10.167.101.46
48	10.167.101.47/32	10.167.101.47 – 10.167.101.47	10.167.101.47
49	10.167.101.48/32	10.167.101.48 – 10.167.101.48	10.167.101.48
50	10.167.101.49/32	10.167.101.49 – 10.167.101.49	10.167.101.49
51	10.167.101.50/32	10.167.101.50 – 10.167.101.50	10.167.101.50
52	10.167.101.51/32	10.167.101.51 – 10.167.101.51	10.167.101.51
53	10.167.101.52/32	10.167.101.52 – 10.167.101.52	10.167.101.52
54	10.167.101.53/32	10.167.101.53 – 10.167.101.53	10.167.101.53
55	10.167.101.54/32	10.167.101.54 – 10.167.101.54	10.167.101.54
56	10.167.101.55/32	10.167.101.55 – 10.167.101.55	10.167.101.55
57	10.167.101.56/32	10.167.101.56 – 10.167.101.56	10.167.101.56
58	10.167.101.57/32	10.167.101.57 – 10.167.101.57	10.167.101.57
59	10.167.101.58/32	10.167.101.58 – 10.167.101.58	10.167.101.58
60	10.167.101.59/32	10.167.101.59 – 10.167.101.59	10.167.101.59
61	10.167.101.60/32	10.167.101.60 – 10.167.101.60	10.167.101.60
62	10.167.101.61/32	10.167.101.61 – 10.167.101.61	10.167.101.61
63	10.167.101.62/32	10.167.101.62 – 10.167.101.62	10.167.101.62
64	10.167.101.63/32	10.167.101.63 – 10.167.101.63	10.167.101.63
65	10.167.101.64/32	10.167.101.64 – 10.167.101.64	10.167.101.64
66	10.167.101.65/32	10.167.101.65 – 10.167.101.65	10.167.101.65
67	10.167.101.66/32	10.167.101.66 – 10.167.101.66	10.167.101.66
68	10.167.101.67/32	10.167.101.67 – 10.167.101.67	10.167.101.67
69	10.167.101.68/32	10.167.101.68 – 10.167.101.68	10.167.101.68
70	10.167.101.69/32	10.167.101.69 – 10.167.101.69	10.167.101.69
71	10.167.101.70/32	10.167.101.70 – 10.167.101.70	10.167.101.70
72	10.167.101.71/32	10.167.101.71 – 10.167.101.71	10.167.101.71
73	10.167.101.72/32	10.167.101.72 – 10.167.101.72	10.167.101.72
74	10.167.101.73/32	10.167.101.73 – 10.167.101.73	10.167.101.73
75	10.167.101.74/32	10.167.101.74 – 10.167.101.74	10.167.101.74
76	10.167.101.75/32	10.167.101.75 – 10.167.101.75	10.167.101.75
77	10.167.101.76/32	10.167.101.76 – 10.167.101.76	10.167.101.76
78	10.167.101.77/32	10.167.101.77 – 10.167.101.77	10.167.101.77
79	10.167.101.78/32	10.167.101.78 – 10.167.101.78	10.167.101.78
80	10.167.101.79/32	10.167.101.79 – 10.167.101.79	10.167.101.79
81	10.167.101.80/32	10.167.101.80 – 10.167.101.80	10.167.101.80
82	10.167.101.81/32	10.167.101.81 – 10.167.101.81	10.167.101.81
83	10.167.101.82/32	10.167.101.82 – 10.167.101.82	10.167.101.82
84	10.167.101.83/32	10.167.101.83 – 10.167.101.83	10.167.101.83
85	10.167.101.84/32	10.167.101.84 – 10.167.101.84	10.167.101.84
86	10.167.101.85/32	10.167.101.85 – 10.167.101.85	10.167.101.85
87	10.167.101.86/32	10.167.101.86 – 10.167.101.86	10.167.101.86
88	10.167.101.87/32	10.167.101.87 – 10.167.101.87	10.167.101.87
89	10.167.101.88/32	10.167.101.88 – 10.167.101.88	10.167.101.88
90	10.167.101.89/32	10.167.101.89 – 10.167.101.89	10.167.101.89
91	10.167.101.90/32	10.167.101.90 – 10.167.101.90	10.167.101.90
92	10.167.101.91/32	10.167.101.91 – 10.167.101.91	10.167.101.91
93	10.167.101.92/32	10.167.101.92 – 10.167.101.92	10.167.101.92
94	10.167.101.93/32	10.167.101.93 – 10.167.101.93	10.167.101.93
95	10.167.101.94/32	10.167.101.94 – 10.167.101.94	10.167.101.94
96	10.167.101.95/32	10.167.101.95 – 10.167.101.95	10.167.101.95
97	10.167.101.96/32	10.167.101.96 – 10.167.101.96	10.167.101.96
98	10.167.101.97/32	10.167.101.97 – 10.167.101.97	10.167.101.97
99	10.167.101.98/32	10.167.101.98 – 10.167.101.98	10.167.101.98
100	10.167.101.99/32	10.167.101.99 – 10.167.101.99	10.167.101.99
101	10.167.101.100/32	10.167.101.100 – 10.167.101.100	10.167.101.100
102	10.167.101.101/32	10.167.101.101 – 10.167.101.101	10.167.101.101
103	10.167.101.102/32	10.167.101.102 – 10.167.101.102	10.167.101.102
104	10.167.101.103/32	10.167.101.103 – 10.167.101.103	10.167.101.103
105	10.167.101.104/32	10.167.101.104 – 10.167.101.104	10.167.101.104
106	10.167.101.105/32	10.167.101.105 – 10.167.101.105	10.167.101.105
107	10.167.101.106/32	10.167.101.106 – 10.167.101.106	10.167.101.106
108	10.167.101.107/32	10.167.101.107 – 10.167.101.107	10.167.101.107
109	10.167.101.108/32	10.167.101.108 – 10.167.101.108	10.167.101.108
110	10.167.101.109/32	10.167.101.109 – 10.167.101.109	10.167.101.109
111	10.167.101.110/32	10.167.101.110 – 10.167.101.110	10.167.101.110
112	10.167.101.111/32	10.167.101.111 – 10.167.101.111	10.167.101.111
113	10.167.101.112/32	10.167.101.112 – 10.167.101.112	10.167.101.112
114	10.167.101.113/32	10.167.101.113 – 10.167.101.113	10.167.101.113
115	10.167.101.114/32	10.167.101.114 – 10.167.101.114	10.167.101.114
116	10.167.101.115/32	10.167.101.115 – 10.167.101.115	10.167.101.115
117	10.167.101.116/32	10.167.101.116 – 10.167.101.116	10.167.101.116
118	10.167.101.117/32	10.167.101.117 – 10.167.101.117	10.167.101.117
119	10.167.101.118/32	10.167.101.118 – 10.167.101.118	10.167.101.118
120	10.167.101.119/32	10.167.101.119 – 10.167.101.119	10.167.101.119
121	10.167.101.120/32	10.167.101.120 – 10.167.101.120	10.167.101.120
122	10.167.101.121/32	10.167.101.121 – 10.167.101.121	10.167.101.121
123	10.167.101.122/32	10.167.101.122 – 10.167.101.122	10.167.101.122
124	10.167.101.123/32	10.167.101.123 – 10.167.101.123	10.167.101.123
125	10.167.101.124/32	10.167.101.124 – 10.167.101.124	10.167.101.124
126	10.167.101.125/32	10.167.101.125 – 10.167.101.125	10.167.101.125
127	10.167.101.126/32	10.167.101.126 – 10.167.101.126	10.167.101.126
128	10.167.101.127/32	10.167.101.127 – 10.167.101.127	10.167.101.127

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 →