In depth analysis of ‘the great Russia firewall’ and site impact

Recently we announced that we got requested by ROSKOMNADZOR to take down some hentai on We complied with this by redirecting all Russians to our safe .net version. I have researched the blocking efficiency based on stats provided by analytics of Gelbooru.

Overall the blocking efficiency is looking at about 50% traffic loss since the block took effect.


Blocking methods can be single page/whole domain/ips and as far as we are aware the ISP can choose its own method of blocking pages that ROSKOMNADZOR provides them. All urls are checked by ‘real experts’ who obviously can’t see the difference between something drawn and something real.

In depth analysis shows that not all ISPs comply with the blacklist and blocking methods seem to vary between simple DNS blocks to whole IP’s being blocked.

Here are some of the most popular ISPs used to visit gelbooru in Russia that we have data on. The names will appear as the real host names, actual ISP name may be slightly different but a simple google lookup should find it. These are just the a few of the hostnames, not a complete report.

Bad hosts (100% blocked)

  • ncnet broadband customers
  • net by net holding llc
  • ojsc rostelecom macroregional branch south
  • jsk sankt-peterburgskoe kabelnoe televidenie
  • skynet network
  • sattel corporation ltd
  • st.petersburg telephone network
  • iskratelecom / iskra-net

Good hosts (0% blocked)

  • comstar-direct cjsc
  • moscow local telephone network (oao mgts)
  • jsc ufanet
  • e-light-telecom
  • llc multiscan
  • llc komtehcentr fttb customers
  • 2com co ltd.
  • siberian networks

Unkown hosts (20-80% blocked, most likely blocked based on DNS)

  • intersvyaz-2 jsc
  • z-telecom network
  • customers broadband aggregation

So it looks like some ISPs are ignoring the ROSKOMNADZOR blacklist or have simply not been contacted by them yet. Its sad to see that censoring is now something we have to deal with on a daily base, this is what you get when old people with no knowledge of the internet make rules for it.

9 comments on “In depth analysis of ‘the great Russia firewall’ and site impact

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