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Dokuwiki.fl8.jp
This page is the page where the administrator's notes and daily records.
transitioning from http://wiki.flateight.com/
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Network/Mask
| CIDR | Decimal | number of hosts | number of addresses |
|---|---|---|---|
| /8 | 255. 0. 0. 0 | 16,777,214 | 16,777,216 |
| /9 | 255.128. 0. 0 | 8,388,606 | 8,388,608 |
| /10 | 255.192. 0. 0 | 4,194,302 | 4,194,304 |
| /11 | 255.224. 0. 0 | 2,097,150 | 2,097,152 |
| /12 | 255.240. 0. 0 | 1,048,574 | 1,048,576 |
| /13 | 255.248. 0. 0 | 524,286 | 524,288 |
| /14 | 255.252. 0. 0 | 262,142 | 262,144 |
| /15 | 255.254. 0. 0 | 131,070 | 131,072 |
| /16 | 255.255. 0. 0 | 65,534 | 65,536 |
| /17 | 255.255.128. 0 | 32,766 | 32,768 |
| /18 | 255.255.192. 0 | 16,382 | 16,384 |
| /19 | 255.255.224. 0 | 8,190 | 8,192 |
| /20 | 255.255.240. 0 | 4,094 | 4,096 |
| /21 | 255.255.248. 0 | 2,046 | 2,048 |
| /22 | 255.255.252. 0 | 1,022 | 1,024 |
| /23 | 255.255.254. 0 | 510 | 512 |
| /24 | 255.255.255. 0 | 254 | 256 |
| /25 | 255.255.255.128 | 126 | 128 |
| /26 | 255.255.255.192 | 62 | 64 |
| /27 | 255.255.255.224 | 30 | 32 |
| /28 | 255.255.255.240 | 14 | 16 |
| /29 | 255.255.255.248 | 6 | 8 |
| /30 | 255.255.255.252 | 2 | 4 |
There is also a command like this
# ipcalc -nbm 192.168.65.101/21 NETMASK=255.255.248.0 BROADCAST=192.168.71.255 NETWORK=192.168.64.0
# ipcalc -p 192.168.64.1 255.255.248.0 PREFIX=21
PST/PDT/JST
PST(UTC-8)
PST(1st Sunday in November 14:00-2nd Sunday in March) to JST(PST+17)
JST 0:00 After that (yellow) is the next day
| PST | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| JST | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 |
PDT(UTC-7)
PDT(2nd Sunday in March 14:00-1st Sunday in November) to JST(PDT+16)
JST 0:00 After that (yellow) is the next day
| PDT | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| JST | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 |
UTC to JST(UTC+9)
JST 0:00 After that (yellow) is the next day
| UTC | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| JST | 9 | 10 | 11 | 12 | 13 | 14 | 15 | 16 | 17 | 18 | 19 | 20 | 21 | 22 | 23 | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
unit
weight
1lbs = 0.453 592 37 kg
1oz floz = 28.349 523 125g
16oz floz = 1lbs
length
1feet = 0.3048m = 30.48cm
1yd = 0.9144 m = 91.44cm
1mile = 1609.344 m = 1.609344km
3feet = 1yd
1760yd = 1mile