mac.lan> cutt -f3 core-asn.txt | sortur | head
119	AS1426
80	AS396982
80	AS24940
56	AS14061
50	AS16276
30	AS7018
27	AS701
23	AS51167
21	AS3209
16	AS22773
    mac.lan> cutt -f3 knots-asn.txt | sortur | head
6	AS5089
5	AS7018
4	AS852
4	AS22773
3	AS701
3	AS2856
2	AS7015
2	AS6730
2	AS64282
2	AS5410