It worked with the Russian investigative team at The Insider to name the first of the two Skripal suspects as GRU agent Anatoly Chepiga last month. Amy Kellogg has the story.
The second Russian who Britain blames for the poisoning of a former spy has been named as a military doctor for Russia's spy service.
Bellingcat said on its website Monday that the man British authorities identified as Alexander Petrov is actually Alexander Mishkin, a trained doctor working for the Russian military intelligence unit known as GRU.
Both he and another man are wanted for attempted murder for a Novichok attack on Sergei Skripal and his daughter Yulia in March.
The British government has blamed Russian Federation for the attack.
"While Aleksandr Mishkin's true persona has an even sparser digital footprint than Anatoly Chepiga's, Bellingcat has been able to establish certain key facts from his background", the October 8 report said.
The investigative website Bellingcat has named him as Alexander Yevgenyevich Mishkin.
The group says it will provide forensic evidence and further information about how it identified Dr Mishkin on Tuesday (local time).
Bellingcat said he graduated from one of Russia's elite Military Medical Academies with the qualification to become a doctor for the Russian naval armed forces.
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Last month, the United Kingdom charged the two Russians with conspiracy to murder and attempted murder.
They explained that they went to the small town as tourists and had always wanted to see its tower.
The father and daughter survived after a lengthy hospital stay in intensive care.
In reaction to Bellingcat's latest report, British police said they would not comment on speculation regarding the real identities of those charged with poisoning the Skripals.
Dawn Sturgess, 44, died in June after being exposed to the same weapons-grade nerve agent after it was apparently discarded.
Alexander Petrov and Ruslan Boshirov told RT's editor-in-chief they had nothing to do with the Skripals' poisoning.
Last week four GRU operatives left a trail of...
The US Justice Department also charged seven GRU officers in an alleged global hacking rampage that targeted more than 250 athletes, a Pennsylvania-based nuclear energy company, a Swiss chemical laboratory and the chemical weapons watchdog.