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)10.167.77.0/25

network10.167.77.0/25

broadcast10.167.77.127

first host10.167.77.1

last host10.167.77.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.167.77.0/25

address00001010.10100111.01001101.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.10100111.01001101.00000000

broadcast00001010.10100111.01001101.01111111

green = network part, grey = host part

hex0x0aa74d00

decimal178736384

reverse dns0.77.167.10.in-addr.arpa

ipv4-mapped::ffff:aa7:4d00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.167.77.0/32	10.167.77.0 – 10.167.77.0	10.167.77.0
2	10.167.77.1/32	10.167.77.1 – 10.167.77.1	10.167.77.1
3	10.167.77.2/32	10.167.77.2 – 10.167.77.2	10.167.77.2
4	10.167.77.3/32	10.167.77.3 – 10.167.77.3	10.167.77.3
5	10.167.77.4/32	10.167.77.4 – 10.167.77.4	10.167.77.4
6	10.167.77.5/32	10.167.77.5 – 10.167.77.5	10.167.77.5
7	10.167.77.6/32	10.167.77.6 – 10.167.77.6	10.167.77.6
8	10.167.77.7/32	10.167.77.7 – 10.167.77.7	10.167.77.7
9	10.167.77.8/32	10.167.77.8 – 10.167.77.8	10.167.77.8
10	10.167.77.9/32	10.167.77.9 – 10.167.77.9	10.167.77.9
11	10.167.77.10/32	10.167.77.10 – 10.167.77.10	10.167.77.10
12	10.167.77.11/32	10.167.77.11 – 10.167.77.11	10.167.77.11
13	10.167.77.12/32	10.167.77.12 – 10.167.77.12	10.167.77.12
14	10.167.77.13/32	10.167.77.13 – 10.167.77.13	10.167.77.13
15	10.167.77.14/32	10.167.77.14 – 10.167.77.14	10.167.77.14
16	10.167.77.15/32	10.167.77.15 – 10.167.77.15	10.167.77.15
17	10.167.77.16/32	10.167.77.16 – 10.167.77.16	10.167.77.16
18	10.167.77.17/32	10.167.77.17 – 10.167.77.17	10.167.77.17
19	10.167.77.18/32	10.167.77.18 – 10.167.77.18	10.167.77.18
20	10.167.77.19/32	10.167.77.19 – 10.167.77.19	10.167.77.19
21	10.167.77.20/32	10.167.77.20 – 10.167.77.20	10.167.77.20
22	10.167.77.21/32	10.167.77.21 – 10.167.77.21	10.167.77.21
23	10.167.77.22/32	10.167.77.22 – 10.167.77.22	10.167.77.22
24	10.167.77.23/32	10.167.77.23 – 10.167.77.23	10.167.77.23
25	10.167.77.24/32	10.167.77.24 – 10.167.77.24	10.167.77.24
26	10.167.77.25/32	10.167.77.25 – 10.167.77.25	10.167.77.25
27	10.167.77.26/32	10.167.77.26 – 10.167.77.26	10.167.77.26
28	10.167.77.27/32	10.167.77.27 – 10.167.77.27	10.167.77.27
29	10.167.77.28/32	10.167.77.28 – 10.167.77.28	10.167.77.28
30	10.167.77.29/32	10.167.77.29 – 10.167.77.29	10.167.77.29
31	10.167.77.30/32	10.167.77.30 – 10.167.77.30	10.167.77.30
32	10.167.77.31/32	10.167.77.31 – 10.167.77.31	10.167.77.31
33	10.167.77.32/32	10.167.77.32 – 10.167.77.32	10.167.77.32
34	10.167.77.33/32	10.167.77.33 – 10.167.77.33	10.167.77.33
35	10.167.77.34/32	10.167.77.34 – 10.167.77.34	10.167.77.34
36	10.167.77.35/32	10.167.77.35 – 10.167.77.35	10.167.77.35
37	10.167.77.36/32	10.167.77.36 – 10.167.77.36	10.167.77.36
38	10.167.77.37/32	10.167.77.37 – 10.167.77.37	10.167.77.37
39	10.167.77.38/32	10.167.77.38 – 10.167.77.38	10.167.77.38
40	10.167.77.39/32	10.167.77.39 – 10.167.77.39	10.167.77.39
41	10.167.77.40/32	10.167.77.40 – 10.167.77.40	10.167.77.40
42	10.167.77.41/32	10.167.77.41 – 10.167.77.41	10.167.77.41
43	10.167.77.42/32	10.167.77.42 – 10.167.77.42	10.167.77.42
44	10.167.77.43/32	10.167.77.43 – 10.167.77.43	10.167.77.43
45	10.167.77.44/32	10.167.77.44 – 10.167.77.44	10.167.77.44
46	10.167.77.45/32	10.167.77.45 – 10.167.77.45	10.167.77.45
47	10.167.77.46/32	10.167.77.46 – 10.167.77.46	10.167.77.46
48	10.167.77.47/32	10.167.77.47 – 10.167.77.47	10.167.77.47
49	10.167.77.48/32	10.167.77.48 – 10.167.77.48	10.167.77.48
50	10.167.77.49/32	10.167.77.49 – 10.167.77.49	10.167.77.49
51	10.167.77.50/32	10.167.77.50 – 10.167.77.50	10.167.77.50
52	10.167.77.51/32	10.167.77.51 – 10.167.77.51	10.167.77.51
53	10.167.77.52/32	10.167.77.52 – 10.167.77.52	10.167.77.52
54	10.167.77.53/32	10.167.77.53 – 10.167.77.53	10.167.77.53
55	10.167.77.54/32	10.167.77.54 – 10.167.77.54	10.167.77.54
56	10.167.77.55/32	10.167.77.55 – 10.167.77.55	10.167.77.55
57	10.167.77.56/32	10.167.77.56 – 10.167.77.56	10.167.77.56
58	10.167.77.57/32	10.167.77.57 – 10.167.77.57	10.167.77.57
59	10.167.77.58/32	10.167.77.58 – 10.167.77.58	10.167.77.58
60	10.167.77.59/32	10.167.77.59 – 10.167.77.59	10.167.77.59
61	10.167.77.60/32	10.167.77.60 – 10.167.77.60	10.167.77.60
62	10.167.77.61/32	10.167.77.61 – 10.167.77.61	10.167.77.61
63	10.167.77.62/32	10.167.77.62 – 10.167.77.62	10.167.77.62
64	10.167.77.63/32	10.167.77.63 – 10.167.77.63	10.167.77.63
65	10.167.77.64/32	10.167.77.64 – 10.167.77.64	10.167.77.64
66	10.167.77.65/32	10.167.77.65 – 10.167.77.65	10.167.77.65
67	10.167.77.66/32	10.167.77.66 – 10.167.77.66	10.167.77.66
68	10.167.77.67/32	10.167.77.67 – 10.167.77.67	10.167.77.67
69	10.167.77.68/32	10.167.77.68 – 10.167.77.68	10.167.77.68
70	10.167.77.69/32	10.167.77.69 – 10.167.77.69	10.167.77.69
71	10.167.77.70/32	10.167.77.70 – 10.167.77.70	10.167.77.70
72	10.167.77.71/32	10.167.77.71 – 10.167.77.71	10.167.77.71
73	10.167.77.72/32	10.167.77.72 – 10.167.77.72	10.167.77.72
74	10.167.77.73/32	10.167.77.73 – 10.167.77.73	10.167.77.73
75	10.167.77.74/32	10.167.77.74 – 10.167.77.74	10.167.77.74
76	10.167.77.75/32	10.167.77.75 – 10.167.77.75	10.167.77.75
77	10.167.77.76/32	10.167.77.76 – 10.167.77.76	10.167.77.76
78	10.167.77.77/32	10.167.77.77 – 10.167.77.77	10.167.77.77
79	10.167.77.78/32	10.167.77.78 – 10.167.77.78	10.167.77.78
80	10.167.77.79/32	10.167.77.79 – 10.167.77.79	10.167.77.79
81	10.167.77.80/32	10.167.77.80 – 10.167.77.80	10.167.77.80
82	10.167.77.81/32	10.167.77.81 – 10.167.77.81	10.167.77.81
83	10.167.77.82/32	10.167.77.82 – 10.167.77.82	10.167.77.82
84	10.167.77.83/32	10.167.77.83 – 10.167.77.83	10.167.77.83
85	10.167.77.84/32	10.167.77.84 – 10.167.77.84	10.167.77.84
86	10.167.77.85/32	10.167.77.85 – 10.167.77.85	10.167.77.85
87	10.167.77.86/32	10.167.77.86 – 10.167.77.86	10.167.77.86
88	10.167.77.87/32	10.167.77.87 – 10.167.77.87	10.167.77.87
89	10.167.77.88/32	10.167.77.88 – 10.167.77.88	10.167.77.88
90	10.167.77.89/32	10.167.77.89 – 10.167.77.89	10.167.77.89
91	10.167.77.90/32	10.167.77.90 – 10.167.77.90	10.167.77.90
92	10.167.77.91/32	10.167.77.91 – 10.167.77.91	10.167.77.91
93	10.167.77.92/32	10.167.77.92 – 10.167.77.92	10.167.77.92
94	10.167.77.93/32	10.167.77.93 – 10.167.77.93	10.167.77.93
95	10.167.77.94/32	10.167.77.94 – 10.167.77.94	10.167.77.94
96	10.167.77.95/32	10.167.77.95 – 10.167.77.95	10.167.77.95
97	10.167.77.96/32	10.167.77.96 – 10.167.77.96	10.167.77.96
98	10.167.77.97/32	10.167.77.97 – 10.167.77.97	10.167.77.97
99	10.167.77.98/32	10.167.77.98 – 10.167.77.98	10.167.77.98
100	10.167.77.99/32	10.167.77.99 – 10.167.77.99	10.167.77.99
101	10.167.77.100/32	10.167.77.100 – 10.167.77.100	10.167.77.100
102	10.167.77.101/32	10.167.77.101 – 10.167.77.101	10.167.77.101
103	10.167.77.102/32	10.167.77.102 – 10.167.77.102	10.167.77.102
104	10.167.77.103/32	10.167.77.103 – 10.167.77.103	10.167.77.103
105	10.167.77.104/32	10.167.77.104 – 10.167.77.104	10.167.77.104
106	10.167.77.105/32	10.167.77.105 – 10.167.77.105	10.167.77.105
107	10.167.77.106/32	10.167.77.106 – 10.167.77.106	10.167.77.106
108	10.167.77.107/32	10.167.77.107 – 10.167.77.107	10.167.77.107
109	10.167.77.108/32	10.167.77.108 – 10.167.77.108	10.167.77.108
110	10.167.77.109/32	10.167.77.109 – 10.167.77.109	10.167.77.109
111	10.167.77.110/32	10.167.77.110 – 10.167.77.110	10.167.77.110
112	10.167.77.111/32	10.167.77.111 – 10.167.77.111	10.167.77.111
113	10.167.77.112/32	10.167.77.112 – 10.167.77.112	10.167.77.112
114	10.167.77.113/32	10.167.77.113 – 10.167.77.113	10.167.77.113
115	10.167.77.114/32	10.167.77.114 – 10.167.77.114	10.167.77.114
116	10.167.77.115/32	10.167.77.115 – 10.167.77.115	10.167.77.115
117	10.167.77.116/32	10.167.77.116 – 10.167.77.116	10.167.77.116
118	10.167.77.117/32	10.167.77.117 – 10.167.77.117	10.167.77.117
119	10.167.77.118/32	10.167.77.118 – 10.167.77.118	10.167.77.118
120	10.167.77.119/32	10.167.77.119 – 10.167.77.119	10.167.77.119
121	10.167.77.120/32	10.167.77.120 – 10.167.77.120	10.167.77.120
122	10.167.77.121/32	10.167.77.121 – 10.167.77.121	10.167.77.121
123	10.167.77.122/32	10.167.77.122 – 10.167.77.122	10.167.77.122
124	10.167.77.123/32	10.167.77.123 – 10.167.77.123	10.167.77.123
125	10.167.77.124/32	10.167.77.124 – 10.167.77.124	10.167.77.124
126	10.167.77.125/32	10.167.77.125 – 10.167.77.125	10.167.77.125
127	10.167.77.126/32	10.167.77.126 – 10.167.77.126	10.167.77.126
128	10.167.77.127/32	10.167.77.127 – 10.167.77.127	10.167.77.127

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 →