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Welcome to Core Toolz
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Generated Passwords:
Resolved IP:
Geolocation Details
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Connection
- ASN:
- Org:
- ISP:
- Domain:
Timezone
- ID:
- Abbr:
- UTC:
- Offset:
- Current Time:
Browser Info
User Agent:
Language:
Platform:
Create Encrypted Note & Files
Drag & drop files
or click to upload
(Max: 5 files, 1MB)
Uploading...
Link copied to clipboard!
Error:
🔐 How Encrypted Notes & Files Works
-
You write a note or upload a file.
This is your private content. You can also choose when the note should expire (e.g., in 60 minutes) and whether to set a password. -
Your content is encrypted before it leaves your device.
Using secure technology (AES encryption), your note or file is turned into scrambled code in your browser. This means the server never sees the original content — only the encrypted version. -
A private link is created for you.
After encryption, a unique link is generated. This link includes a secret key or password (unless you chose to set your own). This key is essential to decrypt the note. -
You share the link with someone.
The person who gets the link can view the note only once (if “burn after reading” is enabled) otherwise the link will stay active for the number minutes set when the link was created. If a password was set, they’ll need that too. -
When someone opens the link:
- The app checks if a password is needed.
- If not, it decrypts the note in their browser using the key in the link.
- If yes, they’ll be asked to enter the password before seeing the message.
Encrypted note & files
This was a one-time note link and is now unusable.
Error:
- IP Address:
- Network Address:
- Usable Host IP Range:
- Broadcast Address:
- Total Number of Hosts:
- Number of Usable Hosts:
- Subnet Mask:
- Wildcard Mask:
- Binary Subnet Mask:
- IP Class:
- CIDR Notation:
- IP Type:
- Short:
- Binary ID:
- Integer ID:
- Hex ID:
- in-addr.arpa:
- IPv4 Mapped Address:
- 6to4 Prefix:
Subnet Cheat Sheet
CIDR
Subnet mask
Wildcard mask
# of IP addresses
# of usable IP addresses
/32
255.255.255.255
0.0.0.0
1
1
/31
255.255.255.254
0.0.0.1
2
2
/30
255.255.255.252
0.0.0.3
4
2
/29
255.255.255.248
0.0.0.7
8
6
/28
255.255.255.240
0.0.0.15
16
14
/27
255.255.255.224
0.0.0.31
32
30
/26
255.255.255.192
0.0.0.63
64
62
/25
255.255.255.128
0.0.0.127
128
126
/24
255.255.255.0
0.0.0.255
256
254
/23
255.255.254.0
0.0.1.255
512
510
/22
255.255.252.0
0.0.3.255
1,024
1,022
/21
255.255.248.0
0.0.7.255
2,048
2,046
/20
255.255.240.0
0.0.15.255
4,096
4,094
/19
255.255.224.0
0.0.31.255
8,192
8,190
/18
255.255.192.0
0.0.63.255
16,384
16,382
/17
255.255.128.0
0.0.127.255
32,768
32,766
/16
255.255.0.0
0.0.255.255
65,536
65,534
/15
255.254.0.0
0.1.255.255
131,072
131,070
/14
255.252.0.0
0.3.255.255
262,144
262,142
/13
255.248.0.0
0.7.255.255
524,288
524,286
/12
255.240.0.0
0.15.255.255
1,048,576
1,048,574
/11
255.224.0.0
0.31.255.255
2,097,152
2,097,150
/10
255.192.0.0
0.63.255.255
4,194,304
4,194,302
/9
255.128.0.0
0.127.255.255
8,388,608
8,388,606
/8
255.0.0.0
0.255.255.255
16,777,216
16,777,214
/7
254.0.0.0
1.255.255.255
33,554,432
33,554,430
/6
252.0.0.0
3.255.255.255
67,108,864
67,108,862
/5
248.0.0.0
7.255.255.255
134,217,728
134,217,726
/4
240.0.0.0
15.255.255.255
268,435,456
268,435,454
/3
224.0.0.0
31.255.255.255
536,870,912
536,870,910
/2
192.0.0.0
63.255.255.255
1,073,741,824
1,073,741,822
/1
128.0.0.0
127.255.255.255
2,147,483,648
2,147,483,646
/0
0.0.0.0
255.255.255.255
4,294,967,296
4,294,967,294
Private IP Ranges
- 10.0.0.0 - 10.255.255.255 (/8)
- 172.16.0.0 - 172.31.255.255 (/12)
- 192.168.0.0 - 192.168.255.255 (/16)
DNS Records
Reverse DNS
HTTPS Test
WHOIS Info
Download
Upload
Latency
Other Internet Speed Test Sites
| Site | Description |
|---|---|
| Speedtest.net | Most popular speed test with global server network |
| Fast.com | Netflix’s simple test, focused on download speed |
| Cloudflare Speed | Tests from Cloudflare edge servers |
| Google Speed Test | Quick test via Google search powered by M-Lab |
Resolved IP:
Tidy & Convert: JSON, XML, YAML
Error:
HTML Formatter & Tidier
Error:
Cron Expression Builder & Parser
Use numbers, commas, asterisks (*), and slashes (/) to define your schedule. Examples:
*= every unit*/2= every 2 units0,15,30= at minutes 0, 15, and 30
Invalid characters. Only 0-9, ,, *, /, - allowed.
Invalid characters. Only 0-9, ,, *, /, - allowed.
Invalid characters. Only 0-9, ,, *, /, - allowed.
Invalid characters. Only 0-9, ,, *, /, - allowed.
Invalid characters. Only 0-9, ,, *, /, - allowed.
Cron Line
Parsed Description
📦 Tar (.tar, .tar.gz)
# Create a .tar.gz archive tar -czvf archive-name.tar.gz folder-name/ # Extract a .tar.gz archive tar -xzvf archive-name.tar.gz # List contents tar -tzvf archive-name.tar.gz # Extract to a specific directory tar -xzvf archive-name.tar.gz -C /path/to/target/ # Create .tar only tar -cvf archive-name.tar folder-name/ # Extract .tar tar -xvf archive-name.tar
🗜️ Zip
# Create a zip zip -r archive-name.zip folder-name/ # Create a password-protected zip zip -r -e archive-name.zip folder-name/ # Extract zip unzip archive-name.zip # List contents unzip -l archive-name.zip # Extract to a specific directory unzip archive-name.zip -d /path/to/target/
📚 Rar
# Create rar (requires rar package) rar a archive-name.rar folder-name/ # Create password-protected rar rar a -p archive-name.rar folder-name/ # Extract rar unrar x archive-name.rar # List contents unrar l archive-name.rar # Extract to directory unrar x archive-name.rar /path/to/target/
🗃️ 7z (7-Zip)
# Create a 7z archive 7z a archive-name.7z folder-name/ # Create password-protected 7z 7z a -p archive-name.7z folder-name/ # Extract 7z 7z x archive-name.7z # List contents 7z l archive-name.7z # Extract to specific directory 7z x archive-name.7z -o/path/to/target/
Archive Commands (tar, zip, rar, 7z)
🔐 SSH Backup & Restore
# 🔁 Rsync backup to remote server rsync -avz folder-name/ user@remote:/backup/path/ # 🔁 Rsync restore from remote rsync -avz user@remote:/backup/path/ folder-name/ # 📤 SCP upload a compressed archive scp archive-name.tar.gz user@remote:/backup/path/ # 📥 SCP download scp user@remote:/backup/path/archive-name.tar.gz ./ # 📦 Remote tar and stream over SSH (backup) tar czf - folder-name/ | ssh user@remote "cat > backup.tar.gz" # 📥 Remote extract streamed tar over SSH ssh user@remote "cat backup.tar.gz" | tar xzvf -
📘 Common Linux Commands
Generating passwords...