Entries in my Mac OSX routing table

I undestand basics of IPv4 and subneting but I could not find a definite answer of what some of these entries in my routing table mean:

netstat -nr

Destination        Gateway            Flags        Refs      Use   Netif    Expire
0/1                10.0.0.1           UGSc           16        0     en0
default            10.0.3.149         UGSc            0        0   utun0
10/24              link#4             UCS             5        0     en0
10/20              10.0.3.149         UGSc            1        0   utun0
128.0/1            10.0.0.1           UGSc           29        0     en0

I understand the default entry. Is 0/1 also default routing? What does 10/24 mean, same as 10.0.0.0/24? I know 10 would be equivalent to 10.0.0.0/8 (ie 255.0.0.0 netmask). 128.0/1 : that is another mysterious one. Thank you!

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