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Very-high-energy $\gamma$-ray observations of the active galaxy IC 310 withthe MAGIC telescopes have revealed fast variability with doubling time scalesof less than 4.8min. This implies that the emission region in IC 310 is smallerthan 20% of the gravitational radius of the central supermassive black holewith a mass of $3\times 10^8 M_\odot$, which poses serious questions on theemission mechanism and classification of this enigmatic object. We report onthe first quasi-simultaneous multi-frequency VLBI observations of IC 310conducted with the EVN. We find a blazar-like one-sided core-jet structure onparsec scales, constraining the inclination angle to be less than $\sim20^\circ$ but very small angles are excluded to limit the de-projected lengthof the large-scale radio jet.

The EVN view of the highly variable TeV active galaxy IC 310