The initial discovery of astrophysical neutrino flux around PeV energies (Aartsen et al. 2013a) a few years ago marked the beginning of high-energy neutrino astronomy. Since then, the properties of the flux have been measured with increasing accuracy (Aartsen et al. 2015a). The most recent results indicate a soft spectrum with a spectral index of− 2.5± 0.1 between around 10TeV and 2PeV with no significant deviation from an equal flavor composition on Earth (Aartsen et al. 2015b). The neutrino signal has been found to be compatible with an isotropic distribution in the sky. This apparent isotropy suggests that a significant fraction of the observed neutrinos are of extragalactic origin, a result which is also supported by Ahlers et al.(2016). However, there are also indications for a 3-σ anisotropy (Neronov & Semikoz 2016) if low-energy events (< 100 TeV) are omitted. Further data are required to settle this issue.