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)10.76.121.0/25

network10.76.121.0/25

broadcast10.76.121.127

first host10.76.121.1

last host10.76.121.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.76.121.0/25

address00001010.01001100.01111001.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.01001100.01111001.00000000

broadcast00001010.01001100.01111001.01111111

green = network part, grey = host part

hex0x0a4c7900

decimal172783872

reverse dns0.121.76.10.in-addr.arpa

ipv4-mapped::ffff:a4c:7900

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.76.121.0/32	10.76.121.0 – 10.76.121.0	10.76.121.0
2	10.76.121.1/32	10.76.121.1 – 10.76.121.1	10.76.121.1
3	10.76.121.2/32	10.76.121.2 – 10.76.121.2	10.76.121.2
4	10.76.121.3/32	10.76.121.3 – 10.76.121.3	10.76.121.3
5	10.76.121.4/32	10.76.121.4 – 10.76.121.4	10.76.121.4
6	10.76.121.5/32	10.76.121.5 – 10.76.121.5	10.76.121.5
7	10.76.121.6/32	10.76.121.6 – 10.76.121.6	10.76.121.6
8	10.76.121.7/32	10.76.121.7 – 10.76.121.7	10.76.121.7
9	10.76.121.8/32	10.76.121.8 – 10.76.121.8	10.76.121.8
10	10.76.121.9/32	10.76.121.9 – 10.76.121.9	10.76.121.9
11	10.76.121.10/32	10.76.121.10 – 10.76.121.10	10.76.121.10
12	10.76.121.11/32	10.76.121.11 – 10.76.121.11	10.76.121.11
13	10.76.121.12/32	10.76.121.12 – 10.76.121.12	10.76.121.12
14	10.76.121.13/32	10.76.121.13 – 10.76.121.13	10.76.121.13
15	10.76.121.14/32	10.76.121.14 – 10.76.121.14	10.76.121.14
16	10.76.121.15/32	10.76.121.15 – 10.76.121.15	10.76.121.15
17	10.76.121.16/32	10.76.121.16 – 10.76.121.16	10.76.121.16
18	10.76.121.17/32	10.76.121.17 – 10.76.121.17	10.76.121.17
19	10.76.121.18/32	10.76.121.18 – 10.76.121.18	10.76.121.18
20	10.76.121.19/32	10.76.121.19 – 10.76.121.19	10.76.121.19
21	10.76.121.20/32	10.76.121.20 – 10.76.121.20	10.76.121.20
22	10.76.121.21/32	10.76.121.21 – 10.76.121.21	10.76.121.21
23	10.76.121.22/32	10.76.121.22 – 10.76.121.22	10.76.121.22
24	10.76.121.23/32	10.76.121.23 – 10.76.121.23	10.76.121.23
25	10.76.121.24/32	10.76.121.24 – 10.76.121.24	10.76.121.24
26	10.76.121.25/32	10.76.121.25 – 10.76.121.25	10.76.121.25
27	10.76.121.26/32	10.76.121.26 – 10.76.121.26	10.76.121.26
28	10.76.121.27/32	10.76.121.27 – 10.76.121.27	10.76.121.27
29	10.76.121.28/32	10.76.121.28 – 10.76.121.28	10.76.121.28
30	10.76.121.29/32	10.76.121.29 – 10.76.121.29	10.76.121.29
31	10.76.121.30/32	10.76.121.30 – 10.76.121.30	10.76.121.30
32	10.76.121.31/32	10.76.121.31 – 10.76.121.31	10.76.121.31
33	10.76.121.32/32	10.76.121.32 – 10.76.121.32	10.76.121.32
34	10.76.121.33/32	10.76.121.33 – 10.76.121.33	10.76.121.33
35	10.76.121.34/32	10.76.121.34 – 10.76.121.34	10.76.121.34
36	10.76.121.35/32	10.76.121.35 – 10.76.121.35	10.76.121.35
37	10.76.121.36/32	10.76.121.36 – 10.76.121.36	10.76.121.36
38	10.76.121.37/32	10.76.121.37 – 10.76.121.37	10.76.121.37
39	10.76.121.38/32	10.76.121.38 – 10.76.121.38	10.76.121.38
40	10.76.121.39/32	10.76.121.39 – 10.76.121.39	10.76.121.39
41	10.76.121.40/32	10.76.121.40 – 10.76.121.40	10.76.121.40
42	10.76.121.41/32	10.76.121.41 – 10.76.121.41	10.76.121.41
43	10.76.121.42/32	10.76.121.42 – 10.76.121.42	10.76.121.42
44	10.76.121.43/32	10.76.121.43 – 10.76.121.43	10.76.121.43
45	10.76.121.44/32	10.76.121.44 – 10.76.121.44	10.76.121.44
46	10.76.121.45/32	10.76.121.45 – 10.76.121.45	10.76.121.45
47	10.76.121.46/32	10.76.121.46 – 10.76.121.46	10.76.121.46
48	10.76.121.47/32	10.76.121.47 – 10.76.121.47	10.76.121.47
49	10.76.121.48/32	10.76.121.48 – 10.76.121.48	10.76.121.48
50	10.76.121.49/32	10.76.121.49 – 10.76.121.49	10.76.121.49
51	10.76.121.50/32	10.76.121.50 – 10.76.121.50	10.76.121.50
52	10.76.121.51/32	10.76.121.51 – 10.76.121.51	10.76.121.51
53	10.76.121.52/32	10.76.121.52 – 10.76.121.52	10.76.121.52
54	10.76.121.53/32	10.76.121.53 – 10.76.121.53	10.76.121.53
55	10.76.121.54/32	10.76.121.54 – 10.76.121.54	10.76.121.54
56	10.76.121.55/32	10.76.121.55 – 10.76.121.55	10.76.121.55
57	10.76.121.56/32	10.76.121.56 – 10.76.121.56	10.76.121.56
58	10.76.121.57/32	10.76.121.57 – 10.76.121.57	10.76.121.57
59	10.76.121.58/32	10.76.121.58 – 10.76.121.58	10.76.121.58
60	10.76.121.59/32	10.76.121.59 – 10.76.121.59	10.76.121.59
61	10.76.121.60/32	10.76.121.60 – 10.76.121.60	10.76.121.60
62	10.76.121.61/32	10.76.121.61 – 10.76.121.61	10.76.121.61
63	10.76.121.62/32	10.76.121.62 – 10.76.121.62	10.76.121.62
64	10.76.121.63/32	10.76.121.63 – 10.76.121.63	10.76.121.63
65	10.76.121.64/32	10.76.121.64 – 10.76.121.64	10.76.121.64
66	10.76.121.65/32	10.76.121.65 – 10.76.121.65	10.76.121.65
67	10.76.121.66/32	10.76.121.66 – 10.76.121.66	10.76.121.66
68	10.76.121.67/32	10.76.121.67 – 10.76.121.67	10.76.121.67
69	10.76.121.68/32	10.76.121.68 – 10.76.121.68	10.76.121.68
70	10.76.121.69/32	10.76.121.69 – 10.76.121.69	10.76.121.69
71	10.76.121.70/32	10.76.121.70 – 10.76.121.70	10.76.121.70
72	10.76.121.71/32	10.76.121.71 – 10.76.121.71	10.76.121.71
73	10.76.121.72/32	10.76.121.72 – 10.76.121.72	10.76.121.72
74	10.76.121.73/32	10.76.121.73 – 10.76.121.73	10.76.121.73
75	10.76.121.74/32	10.76.121.74 – 10.76.121.74	10.76.121.74
76	10.76.121.75/32	10.76.121.75 – 10.76.121.75	10.76.121.75
77	10.76.121.76/32	10.76.121.76 – 10.76.121.76	10.76.121.76
78	10.76.121.77/32	10.76.121.77 – 10.76.121.77	10.76.121.77
79	10.76.121.78/32	10.76.121.78 – 10.76.121.78	10.76.121.78
80	10.76.121.79/32	10.76.121.79 – 10.76.121.79	10.76.121.79
81	10.76.121.80/32	10.76.121.80 – 10.76.121.80	10.76.121.80
82	10.76.121.81/32	10.76.121.81 – 10.76.121.81	10.76.121.81
83	10.76.121.82/32	10.76.121.82 – 10.76.121.82	10.76.121.82
84	10.76.121.83/32	10.76.121.83 – 10.76.121.83	10.76.121.83
85	10.76.121.84/32	10.76.121.84 – 10.76.121.84	10.76.121.84
86	10.76.121.85/32	10.76.121.85 – 10.76.121.85	10.76.121.85
87	10.76.121.86/32	10.76.121.86 – 10.76.121.86	10.76.121.86
88	10.76.121.87/32	10.76.121.87 – 10.76.121.87	10.76.121.87
89	10.76.121.88/32	10.76.121.88 – 10.76.121.88	10.76.121.88
90	10.76.121.89/32	10.76.121.89 – 10.76.121.89	10.76.121.89
91	10.76.121.90/32	10.76.121.90 – 10.76.121.90	10.76.121.90
92	10.76.121.91/32	10.76.121.91 – 10.76.121.91	10.76.121.91
93	10.76.121.92/32	10.76.121.92 – 10.76.121.92	10.76.121.92
94	10.76.121.93/32	10.76.121.93 – 10.76.121.93	10.76.121.93
95	10.76.121.94/32	10.76.121.94 – 10.76.121.94	10.76.121.94
96	10.76.121.95/32	10.76.121.95 – 10.76.121.95	10.76.121.95
97	10.76.121.96/32	10.76.121.96 – 10.76.121.96	10.76.121.96
98	10.76.121.97/32	10.76.121.97 – 10.76.121.97	10.76.121.97
99	10.76.121.98/32	10.76.121.98 – 10.76.121.98	10.76.121.98
100	10.76.121.99/32	10.76.121.99 – 10.76.121.99	10.76.121.99
101	10.76.121.100/32	10.76.121.100 – 10.76.121.100	10.76.121.100
102	10.76.121.101/32	10.76.121.101 – 10.76.121.101	10.76.121.101
103	10.76.121.102/32	10.76.121.102 – 10.76.121.102	10.76.121.102
104	10.76.121.103/32	10.76.121.103 – 10.76.121.103	10.76.121.103
105	10.76.121.104/32	10.76.121.104 – 10.76.121.104	10.76.121.104
106	10.76.121.105/32	10.76.121.105 – 10.76.121.105	10.76.121.105
107	10.76.121.106/32	10.76.121.106 – 10.76.121.106	10.76.121.106
108	10.76.121.107/32	10.76.121.107 – 10.76.121.107	10.76.121.107
109	10.76.121.108/32	10.76.121.108 – 10.76.121.108	10.76.121.108
110	10.76.121.109/32	10.76.121.109 – 10.76.121.109	10.76.121.109
111	10.76.121.110/32	10.76.121.110 – 10.76.121.110	10.76.121.110
112	10.76.121.111/32	10.76.121.111 – 10.76.121.111	10.76.121.111
113	10.76.121.112/32	10.76.121.112 – 10.76.121.112	10.76.121.112
114	10.76.121.113/32	10.76.121.113 – 10.76.121.113	10.76.121.113
115	10.76.121.114/32	10.76.121.114 – 10.76.121.114	10.76.121.114
116	10.76.121.115/32	10.76.121.115 – 10.76.121.115	10.76.121.115
117	10.76.121.116/32	10.76.121.116 – 10.76.121.116	10.76.121.116
118	10.76.121.117/32	10.76.121.117 – 10.76.121.117	10.76.121.117
119	10.76.121.118/32	10.76.121.118 – 10.76.121.118	10.76.121.118
120	10.76.121.119/32	10.76.121.119 – 10.76.121.119	10.76.121.119
121	10.76.121.120/32	10.76.121.120 – 10.76.121.120	10.76.121.120
122	10.76.121.121/32	10.76.121.121 – 10.76.121.121	10.76.121.121
123	10.76.121.122/32	10.76.121.122 – 10.76.121.122	10.76.121.122
124	10.76.121.123/32	10.76.121.123 – 10.76.121.123	10.76.121.123
125	10.76.121.124/32	10.76.121.124 – 10.76.121.124	10.76.121.124
126	10.76.121.125/32	10.76.121.125 – 10.76.121.125	10.76.121.125
127	10.76.121.126/32	10.76.121.126 – 10.76.121.126	10.76.121.126
128	10.76.121.127/32	10.76.121.127 – 10.76.121.127	10.76.121.127

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 →