It’s a remarkable achievement when you consider the amazing names to have featured for the home nations since the birth of the game, and the Rangers man shows no signs of stopping having last week committed himself to the Light Blues for another year.
When the Ulstermen take to the field against Bulgaria tonight, they’ll unfortunately not be joined by any of the famous Green and White Army, but among those watching from home will be Davis’ former international and Rangers teammate, Gareth McAuley.
Now retired from playing, it says so much about Davis’ longevity that he won his first cap before McAuley did – but even in those early days watching on from the stands in Belfast, the defender was mightily impressed by what he was seeing from this young County Antrim midfielder.
McAuley explained: "I was a Northern Ireland fan when Davo started - he got his first cap before mine! But Davo turned up on the scene and just played with such maturity right from the start.
"Listen, he has got better and better and better over the years and improved, but right from the start, his performances were so mature for a young kid when he got his first cap."
Through the late 2000s, Northern Ireland, under the management of Lawrie Sanchez and then Nigel Worthington began to claim the scalps of a number of top nations, most notably England and then Euro 2008, World Cup 2010 and Euro 2012 winners, Spain.
"He was massive,” McAuley said of Davis influence in those matched. “Davo set the tempo - when we played through Davo, we played at his pace.
"His football knowledge was really, really good right from the start, and he knew when to quicken things up, when to slow things down and he would drive forward with the ball and carry us up the pitch.
"He got assists - like the one for David Healy's goal against England at the Kop end. He was the heartbeat of the team right from the start, and I think everyone looked at Davo to manage the games."
After a little stutter in performances and results, Michael O’Neill breathed new life into Northern Ireland ahead of their Euro 2016 qualifying campaign, where, remarkably for such a small nation in a group containing Greece, Romania and Hungary, they topped the group.
McAuley continued: "The biggest tribute through that period you could pay to Davo is the only game we lost in qualification was the game Davo didn't play away to Romania.
"That is how much we missed him in that team. He was playing week-in, week-out in the Premier League under some really top managers, and he was like a sponge learning off them and bringing that into us in the Northern Ireland camp.
"When we got to the finals, you were always relying on him performing because no stage is too big for him - he is that level-headed, and the game how he plays it in training is the game he plays in a Euro finals.
"It's that simplicity of how he does it - he doesn't over-complicate it and he gets the ball and keeps it moving. He sees a pass forward, he put the tempo into us and he set the press.
"All of those things, we were reliant on Davo to do for us and to lead us."
Going into that Euro 2016 final tournament in France was a new experience for the Northern Ireland team with that being their first tournament in 30 years.
Davis, however, was a key voice both in the build-up and during that period, with his leadership skills really coming to the fore.
McAuley said: "He is a quiet, down-to-earth character, but what he does is lead by example. Because he is such a good guy and everyone has respect for him and likes him, they follow him.
"He maybe won't always be a vocal one or a shouter, but he leads by how he approaches everything.
"We as a group followed that and he will be the same at Rangers. He will be doing everything the right way and everyone will be watching him and how he does it.
"He's 36 now but he is still performing at the very highest level - he is kind of the quiet leader but setting an example with how he plays and to the high standards with how he plays, everyone follows him."
The paths of McAuley and Davis also crossed briefly at Rangers in 2018/19, with McAuley enjoying a season at the club, and Davis returning to his boyhood heroes for a second spell in the January of that year.
McAuley his thrilled to see his friend having kicked-on and won 55 with the club, and he recalled his feelings when he heard his international teammate was coming to join him in Glasgow.
He added: "I was delighted as I knew what it meant to him. I knew how hard it was for him when he left under difficult circumstances and I knew he wanted to go back.
"I've not really had a sit down and spoken to him properly about it, but winning 55 and being a part of that there will mean as much to Davo as it any other achievement he has managed in the game.
"He has achieved some massive moments, and I knew when he was coming back that he was going to go on and play and take the game by the scruff of the neck when he got into the Rangers team and got himself fit and playing regularly.
"It was maybe difficult for him at the start as at Southampton, he maybe hadn't played in about six months.
"But when he is in there, he is as good a player as anyone."