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Is this a valid IP Address?

For each IP, you can select whether it's invalid, private, public or special.
"Private" means the usual big blocks, no /24 documantation subnet or anything like that
"Special" means valid and specifically mentioned in an RFC as being "for something" (like CG-NAT, loopback, classes D & E etc.)
Quiz by Meringue
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Last updated: August 19, 2022
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First submittedAugust 19, 2022
Times taken30
Average score41.2%
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Keep scrolling down for answers and more stats ...
1. 192.168.178.1
Private ✓
Public ✓
Special ✓
Invalid ✓
Class C private network
2. 0.0.0.0
Private ✓
Public ✓
Special ✓
Invalid ✓
If a host doesnt have an IP, it uses this as a source IP
3. 254.0.0.1
Private ✓
Public ✓
Special ✓
Invalid ✓
Reserved (for when?)
4. 19.68.33.129
Private ✓
Public ✓
Special ✓
Invalid ✓
5. 169.254.16.5
Private ✓
Public ✓
Special ✓
Invalid ✓
Zeroconf / APIPA. Usually known as the "your DHCP doesn't work"-address
6. 127.128.129.130
Private ✓
Public ✓
Special ✓
Invalid ✓
Loopback is 127.0.0.0/8
7. 170.162.108
Private ✓
Public ✓
Special ✓
Invalid ✓
Only three octets. When pinged usually translates to 170.182.0.108
8. 172.19.97.2
Private ✓
Public ✓
Special ✓
Invalid ✓
Class B private network
9. 55.73.96.31
Private ✓
Public ✓
Special ✓
Invalid ✓
10. 12.0.256.87
Private ✓
Public ✓
Special ✓
Invalid ✓
The third octet is too high (>255)
11. 192.5.99.2
Private ✓
Public ✓
Special ✓
Invalid ✓
12. 172.50.8.32
Private ✓
Public ✓
Special ✓
Invalid ✓
13. 82.63.361.2
Private ✓
Public ✓
Special ✓
Invalid ✓
The third octet is too high (>255)
14. 10.10.10.10
Private ✓
Public ✓
Special ✓
Invalid ✓
Class A private network
15. 255.255.255.255
Private ✓
Public ✓
Special ✓
Invalid ✓
Broadcast-address
16. 10.5.9.15.0
Private ✓
Public ✓
Special ✓
Invalid ✓
Too many octets
17. 1.1.1.1
Private ✓
Public ✓
Special ✓
Invalid ✓
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