The best replacement for 404 is 808.

The best alternatives to 404 are rated as following:
★★★★★  808
★★★★  410
★★★★  301
★★  204
★★  404sx
★★  403
★★  500
★★  303
★★  302
★★  401
★  403 error
★  301 redirect
★  503
★  504
★  405
★  400
★  808 firecrest
★  301 seo
  500 error
  hed 3
  mavic carbone
  sp 555
  303 firecrest
  mpc 500
  sp 606
  easton ec90
  zipp 808
  sp 505
  sp 404sx
  enve 6.7
  directory not found
  606
  fluval 405
  sram s60

Your alternative for 404 is not listed? Suggest!
Speaking about 404, one probably shouldn't forget about location header.

Other search terms related to 404 and their ratings are:
★★★★★ location header
You have in mind a companion for 404 and it is not yet here? Propose!



Google Trends

Scale is based on the average worldwide traffic of 404 in all years. Click on graph for more.
404
808
410