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)10.0.127.0/25

network10.0.127.0/25

broadcast10.0.127.127

first host10.0.127.1

last host10.0.127.126

subnet mask255.255.255.128

wildcard0.0.0.127

addresses128

usable hosts126

classA

ipcalc 10.0.127.0/25

address00001010.00000000.01111111.00000000

subnet mask11111111.11111111.11111111.10000000

network00001010.00000000.01111111.00000000

broadcast00001010.00000000.01111111.01111111

green = network part, grey = host part

hex0x0a007f00

decimal167804672

reverse dns0.127.0.10.in-addr.arpa

ipv4-mapped::ffff:a00:7f00

/25 split into /32 · 128 subnets

close ×

#	network	host range	broadcast
1	10.0.127.0/32	10.0.127.0 – 10.0.127.0	10.0.127.0
2	10.0.127.1/32	10.0.127.1 – 10.0.127.1	10.0.127.1
3	10.0.127.2/32	10.0.127.2 – 10.0.127.2	10.0.127.2
4	10.0.127.3/32	10.0.127.3 – 10.0.127.3	10.0.127.3
5	10.0.127.4/32	10.0.127.4 – 10.0.127.4	10.0.127.4
6	10.0.127.5/32	10.0.127.5 – 10.0.127.5	10.0.127.5
7	10.0.127.6/32	10.0.127.6 – 10.0.127.6	10.0.127.6
8	10.0.127.7/32	10.0.127.7 – 10.0.127.7	10.0.127.7
9	10.0.127.8/32	10.0.127.8 – 10.0.127.8	10.0.127.8
10	10.0.127.9/32	10.0.127.9 – 10.0.127.9	10.0.127.9
11	10.0.127.10/32	10.0.127.10 – 10.0.127.10	10.0.127.10
12	10.0.127.11/32	10.0.127.11 – 10.0.127.11	10.0.127.11
13	10.0.127.12/32	10.0.127.12 – 10.0.127.12	10.0.127.12
14	10.0.127.13/32	10.0.127.13 – 10.0.127.13	10.0.127.13
15	10.0.127.14/32	10.0.127.14 – 10.0.127.14	10.0.127.14
16	10.0.127.15/32	10.0.127.15 – 10.0.127.15	10.0.127.15
17	10.0.127.16/32	10.0.127.16 – 10.0.127.16	10.0.127.16
18	10.0.127.17/32	10.0.127.17 – 10.0.127.17	10.0.127.17
19	10.0.127.18/32	10.0.127.18 – 10.0.127.18	10.0.127.18
20	10.0.127.19/32	10.0.127.19 – 10.0.127.19	10.0.127.19
21	10.0.127.20/32	10.0.127.20 – 10.0.127.20	10.0.127.20
22	10.0.127.21/32	10.0.127.21 – 10.0.127.21	10.0.127.21
23	10.0.127.22/32	10.0.127.22 – 10.0.127.22	10.0.127.22
24	10.0.127.23/32	10.0.127.23 – 10.0.127.23	10.0.127.23
25	10.0.127.24/32	10.0.127.24 – 10.0.127.24	10.0.127.24
26	10.0.127.25/32	10.0.127.25 – 10.0.127.25	10.0.127.25
27	10.0.127.26/32	10.0.127.26 – 10.0.127.26	10.0.127.26
28	10.0.127.27/32	10.0.127.27 – 10.0.127.27	10.0.127.27
29	10.0.127.28/32	10.0.127.28 – 10.0.127.28	10.0.127.28
30	10.0.127.29/32	10.0.127.29 – 10.0.127.29	10.0.127.29
31	10.0.127.30/32	10.0.127.30 – 10.0.127.30	10.0.127.30
32	10.0.127.31/32	10.0.127.31 – 10.0.127.31	10.0.127.31
33	10.0.127.32/32	10.0.127.32 – 10.0.127.32	10.0.127.32
34	10.0.127.33/32	10.0.127.33 – 10.0.127.33	10.0.127.33
35	10.0.127.34/32	10.0.127.34 – 10.0.127.34	10.0.127.34
36	10.0.127.35/32	10.0.127.35 – 10.0.127.35	10.0.127.35
37	10.0.127.36/32	10.0.127.36 – 10.0.127.36	10.0.127.36
38	10.0.127.37/32	10.0.127.37 – 10.0.127.37	10.0.127.37
39	10.0.127.38/32	10.0.127.38 – 10.0.127.38	10.0.127.38
40	10.0.127.39/32	10.0.127.39 – 10.0.127.39	10.0.127.39
41	10.0.127.40/32	10.0.127.40 – 10.0.127.40	10.0.127.40
42	10.0.127.41/32	10.0.127.41 – 10.0.127.41	10.0.127.41
43	10.0.127.42/32	10.0.127.42 – 10.0.127.42	10.0.127.42
44	10.0.127.43/32	10.0.127.43 – 10.0.127.43	10.0.127.43
45	10.0.127.44/32	10.0.127.44 – 10.0.127.44	10.0.127.44
46	10.0.127.45/32	10.0.127.45 – 10.0.127.45	10.0.127.45
47	10.0.127.46/32	10.0.127.46 – 10.0.127.46	10.0.127.46
48	10.0.127.47/32	10.0.127.47 – 10.0.127.47	10.0.127.47
49	10.0.127.48/32	10.0.127.48 – 10.0.127.48	10.0.127.48
50	10.0.127.49/32	10.0.127.49 – 10.0.127.49	10.0.127.49
51	10.0.127.50/32	10.0.127.50 – 10.0.127.50	10.0.127.50
52	10.0.127.51/32	10.0.127.51 – 10.0.127.51	10.0.127.51
53	10.0.127.52/32	10.0.127.52 – 10.0.127.52	10.0.127.52
54	10.0.127.53/32	10.0.127.53 – 10.0.127.53	10.0.127.53
55	10.0.127.54/32	10.0.127.54 – 10.0.127.54	10.0.127.54
56	10.0.127.55/32	10.0.127.55 – 10.0.127.55	10.0.127.55
57	10.0.127.56/32	10.0.127.56 – 10.0.127.56	10.0.127.56
58	10.0.127.57/32	10.0.127.57 – 10.0.127.57	10.0.127.57
59	10.0.127.58/32	10.0.127.58 – 10.0.127.58	10.0.127.58
60	10.0.127.59/32	10.0.127.59 – 10.0.127.59	10.0.127.59
61	10.0.127.60/32	10.0.127.60 – 10.0.127.60	10.0.127.60
62	10.0.127.61/32	10.0.127.61 – 10.0.127.61	10.0.127.61
63	10.0.127.62/32	10.0.127.62 – 10.0.127.62	10.0.127.62
64	10.0.127.63/32	10.0.127.63 – 10.0.127.63	10.0.127.63
65	10.0.127.64/32	10.0.127.64 – 10.0.127.64	10.0.127.64
66	10.0.127.65/32	10.0.127.65 – 10.0.127.65	10.0.127.65
67	10.0.127.66/32	10.0.127.66 – 10.0.127.66	10.0.127.66
68	10.0.127.67/32	10.0.127.67 – 10.0.127.67	10.0.127.67
69	10.0.127.68/32	10.0.127.68 – 10.0.127.68	10.0.127.68
70	10.0.127.69/32	10.0.127.69 – 10.0.127.69	10.0.127.69
71	10.0.127.70/32	10.0.127.70 – 10.0.127.70	10.0.127.70
72	10.0.127.71/32	10.0.127.71 – 10.0.127.71	10.0.127.71
73	10.0.127.72/32	10.0.127.72 – 10.0.127.72	10.0.127.72
74	10.0.127.73/32	10.0.127.73 – 10.0.127.73	10.0.127.73
75	10.0.127.74/32	10.0.127.74 – 10.0.127.74	10.0.127.74
76	10.0.127.75/32	10.0.127.75 – 10.0.127.75	10.0.127.75
77	10.0.127.76/32	10.0.127.76 – 10.0.127.76	10.0.127.76
78	10.0.127.77/32	10.0.127.77 – 10.0.127.77	10.0.127.77
79	10.0.127.78/32	10.0.127.78 – 10.0.127.78	10.0.127.78
80	10.0.127.79/32	10.0.127.79 – 10.0.127.79	10.0.127.79
81	10.0.127.80/32	10.0.127.80 – 10.0.127.80	10.0.127.80
82	10.0.127.81/32	10.0.127.81 – 10.0.127.81	10.0.127.81
83	10.0.127.82/32	10.0.127.82 – 10.0.127.82	10.0.127.82
84	10.0.127.83/32	10.0.127.83 – 10.0.127.83	10.0.127.83
85	10.0.127.84/32	10.0.127.84 – 10.0.127.84	10.0.127.84
86	10.0.127.85/32	10.0.127.85 – 10.0.127.85	10.0.127.85
87	10.0.127.86/32	10.0.127.86 – 10.0.127.86	10.0.127.86
88	10.0.127.87/32	10.0.127.87 – 10.0.127.87	10.0.127.87
89	10.0.127.88/32	10.0.127.88 – 10.0.127.88	10.0.127.88
90	10.0.127.89/32	10.0.127.89 – 10.0.127.89	10.0.127.89
91	10.0.127.90/32	10.0.127.90 – 10.0.127.90	10.0.127.90
92	10.0.127.91/32	10.0.127.91 – 10.0.127.91	10.0.127.91
93	10.0.127.92/32	10.0.127.92 – 10.0.127.92	10.0.127.92
94	10.0.127.93/32	10.0.127.93 – 10.0.127.93	10.0.127.93
95	10.0.127.94/32	10.0.127.94 – 10.0.127.94	10.0.127.94
96	10.0.127.95/32	10.0.127.95 – 10.0.127.95	10.0.127.95
97	10.0.127.96/32	10.0.127.96 – 10.0.127.96	10.0.127.96
98	10.0.127.97/32	10.0.127.97 – 10.0.127.97	10.0.127.97
99	10.0.127.98/32	10.0.127.98 – 10.0.127.98	10.0.127.98
100	10.0.127.99/32	10.0.127.99 – 10.0.127.99	10.0.127.99
101	10.0.127.100/32	10.0.127.100 – 10.0.127.100	10.0.127.100
102	10.0.127.101/32	10.0.127.101 – 10.0.127.101	10.0.127.101
103	10.0.127.102/32	10.0.127.102 – 10.0.127.102	10.0.127.102
104	10.0.127.103/32	10.0.127.103 – 10.0.127.103	10.0.127.103
105	10.0.127.104/32	10.0.127.104 – 10.0.127.104	10.0.127.104
106	10.0.127.105/32	10.0.127.105 – 10.0.127.105	10.0.127.105
107	10.0.127.106/32	10.0.127.106 – 10.0.127.106	10.0.127.106
108	10.0.127.107/32	10.0.127.107 – 10.0.127.107	10.0.127.107
109	10.0.127.108/32	10.0.127.108 – 10.0.127.108	10.0.127.108
110	10.0.127.109/32	10.0.127.109 – 10.0.127.109	10.0.127.109
111	10.0.127.110/32	10.0.127.110 – 10.0.127.110	10.0.127.110
112	10.0.127.111/32	10.0.127.111 – 10.0.127.111	10.0.127.111
113	10.0.127.112/32	10.0.127.112 – 10.0.127.112	10.0.127.112
114	10.0.127.113/32	10.0.127.113 – 10.0.127.113	10.0.127.113
115	10.0.127.114/32	10.0.127.114 – 10.0.127.114	10.0.127.114
116	10.0.127.115/32	10.0.127.115 – 10.0.127.115	10.0.127.115
117	10.0.127.116/32	10.0.127.116 – 10.0.127.116	10.0.127.116
118	10.0.127.117/32	10.0.127.117 – 10.0.127.117	10.0.127.117
119	10.0.127.118/32	10.0.127.118 – 10.0.127.118	10.0.127.118
120	10.0.127.119/32	10.0.127.119 – 10.0.127.119	10.0.127.119
121	10.0.127.120/32	10.0.127.120 – 10.0.127.120	10.0.127.120
122	10.0.127.121/32	10.0.127.121 – 10.0.127.121	10.0.127.121
123	10.0.127.122/32	10.0.127.122 – 10.0.127.122	10.0.127.122
124	10.0.127.123/32	10.0.127.123 – 10.0.127.123	10.0.127.123
125	10.0.127.124/32	10.0.127.124 – 10.0.127.124	10.0.127.124
126	10.0.127.125/32	10.0.127.125 – 10.0.127.125	10.0.127.125
127	10.0.127.126/32	10.0.127.126 – 10.0.127.126	10.0.127.126
128	10.0.127.127/32	10.0.127.127 – 10.0.127.127	10.0.127.127

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 →