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198.18.0.0/15

198.18.0.0/15 is reserved for benchmarking network equipment.

Last updated 2 Nov 2026 from the IANA IPv4 Special-Purpose Address Registry

Short answer

198.18.0.0/15 is reserved for benchmarking network equipment.

Block198.18.0.0/15
First – last198.18.0.0 – 198.19.255.255
Size131,072 addresses
Name in the registryBenchmarking
Defined inRFC 2544
Allocated1999-03
Valid as source / destinationTrue / True
ForwardableTrue
Globally reachableFalse

What it means

RFC 2544 reserves 198.18.0.0/15 for testing the performance of routers and switches in a lab, so test traffic never collides with real addresses.

Some VPN and proxy apps also use addresses from this block internally, so you may see one on your own device; it is not a public address.

Want the address websites actually see for you? Open the Truth Check.

Sources

  1. IANA IPv4 Special-Purpose Address Registry (CC0) · checked 2 Nov 2026
  2. RFC 2544