Three codes were hidden in the HTML source of the A MOMENT OF CONNECTION post on the Investigate Ingress blog.

[1] 21nknxu580tx534513

[2] uy268q83fjl1f7qc31pj2f9lzqzm

[3] 12k050216kl241904l0521l2416jh24

Code #1

Observations

Some numbers are not numbers

Make a 3×6 grid

Reverse rows 2, 4 & 6

Read going down from the upper left 2

2xux531n5t31nk8o45

Convert from leetspeak to get

2xux5einsteink8o4s

A long string with no particular range should hint you on the first step

Convert to morse

..- -.-- ..--- -.... ---.. --.- ---.. ...-- ..-. .--- .-.. .---- ..-. --... --.- -.-. ...-- .---- .--. .--- ..--- ..-. ----. .-.. --.. --.- --.. --

There is 120 bits in the string which can make groups of 8

..--.--. .----... .---..-- .----... ..--..-. .---.-.. .----..- .--...-- .--.-... .--.---- .--..--- ..---..- .----..- ..--..-- .---..--

Dots are 0, Dashes are 1

00110110 01111000 01110011 01111000 00110010 01110100 01111001 01100011 01101000 01101111 01100111 00111001 01111001 00110011 01110011

Convert binary to Ascii

6xsx2tychog9y3s

Numbers work in pair. In the end there is something missing to make the magic work

Split into pairs of numbers and single letters

12 k 05 02 16 k l 24 19 04 l 05 21 l 24 16 j h 24

Convert numbers to letters using a=0

MkFCQklYTElFVlYQjhY

Padding the string with a = sign give a good passcode start

2ABBIXLIEVV

After playing with the code a bit seems like a 0 was missing in the string

MkFCQklYTElFV0lYQjhY

Convert Base64 to text

2ABBIXLIEWIXB8X

Convert those IX to 9 from roman numerals

2ABB9LIEW9B8X