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We present WISE All-Sky mid-infrared (IR) survey detections of 55% (17/31) ofthe known QSOs at z>6 from a range of surveys: the SDSS, the CFHT-LS, FIRST,Spitzer and UKIDSS. The WISE catalog thus provides a substantial increase inthe quantity of IR data available for these sources: 17 are detected in theWISE W1 (3.4-micron) band, 16 in W2 (4.6-micron), 3 in W3 (12-micron) and 0 inW4 (22-micron). This is particularly important with Spitzer in its warm-missionphase and no faint follow-up capability at wavelengths longwards of 5 micronsuntil the launch of JWST. WISE thus provides a useful tool for understandingQSOs found in forthcoming large-area optical/IR sky surveys, using PanSTARRS,SkyMapper, VISTA, DES and LSST. The rest-UV properties of the WISE-detected andthe WISE-non-detected samples differ: the detections have brighter i/z-bandmagnitudes and redder rest-UV colors. This suggests that a more aggressive huntfor very-high-redshift QSOs, by combining WISE W1 and W2 data with red observedoptical colors could be effective at least for a subset of dusty candidateQSOs. Stacking the WISE images of the WISE-non-detected QSOs indicates thatthey are on average significantly fainter than the WISE-detected examples, andare thus not narrowly missing detection in the WISE catalog. The WISE-catalogdetection of three of our sample in the W3 band indicates that their mid-IRflux can be detected individually, although there is no stacked W3 detection ofsources detected in W1 but not W3. Stacking analyses of WISE data for large AGNsamples will be a useful tool, and high-redshift QSOs of all types will be easytargets for JWST.

WISE detections of known QSOs at redshifts greater than six