

How can I check if my IPv4 address is on a blacklist? (online tools)
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what is my ip4 Informational
- My IP on the web (IPv4). Lookup my IP address online (IPv4).
- How do organizations obtain blocks of IPv4 addresses? (through RIRs, brokers)
- How does an IPv4 firewall work? (informational)
- What is the maximum number of IPv4 addresses? (informational). How many bits is an IPv4 address? (informational)
- Find my public IP address (IPv4). What is my IP address for the internet? (IPv4)
- What IP address am I broadcasting? (IPv4). My network's public IPv4.
- Why is reverse DNS sometimes important (e.g., for email server reputation)? (anti-spam measures). How can I perform a reverse DNS lookup for an IPv4 address? (online tools and command-line utilities like 'nslookup'). What are the different classes of IPv4 addresses (Class A, B, C, D, E) and their historical significance? (mostly obsolete now due to CIDR)
- What are reserved IPv4 addresses? (informational). Can you ping my IPv4 address? (generally, not from this context)
- What is the difference between my computer's IP address and my router's IP address? (explanation of network layers). What is the purpose of the 169.254.x.x (APIPA/link-local) address range? (troubleshooting scenario)
- What is my external IPv4 address? How to check my IPv4?
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