There are special purpose, not globally routed IP addresses in 198.51.100.0/24.
198.51.100.0/24 - Documentation (TEST-NET-2) 198.51.100.0/24 was allocated on January of 2010. Addresses in 198.51.100.0/24 may NOT be used as the source address of an IP datagram that transits two devices. Addresses in 198.51.100.0/24 may NOT be used as the destination address of an IP datagram that transits two devices. Addresses in 198.51.100.0/24 are NOT forwardable. A router may NOT forward an IP datagram to Addresses in 198.51.100.0/24 between external interfaces Addresses in 198.51.100.0/24 are NOT globally reachable An IP datagram may NOT be forwarded to Addresses in 198.51.100.0/24 beyond a specified administative domain. The 198.51.100.0/24 address block is used in documentation and example code. It is often used in conjuction with domain names example.com or example.net in vendor and protocol documentation. Addresses contained in 198.51.100.0/24 do not legitimately appear on the public Internet and they may be used without any coordination with IANA or an Internet registry. [ RFC5737, ^ ] , IPv4 Address Blocks Reserved for Documentation.
Please enter public globally routed Internet IP numbers.See !ptr24 and !help !ptr24 for examples.

  
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