Oracle 21c

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CREATE TABLE t (
  col1 VARCHAR(100)
);
insert all
    into t values ('1')
    into t values ('55')
    into t values ('82')
    into t values ('u1')
    into t values ('2')
    into t values ('11')
    into t values ('60')
    into t values ('90')
    into t values ('3B1')
    into t values ('3B2')
    into t values ('PORT/0/635')
    into t values ('72')
    into t values ('75')
    into t values ('77')
    into t values ('85')
    into t values ('118')
select * from dual
16 rows affected

select   *
from     t
order by TO_NUMBER(col1 DEFAULT null ON CONVERSION ERROR) nulls last
        ,col1


        


COL1


1

2

11

55

60

72

75

77

82

85

90

118

3B1

3B2

PORT/0/635

u1