You can Integrate https://ipstack.com/, by creating a service when a user logs in.
Please follow:  
Create Service for Get IP Address –
- my-user-serv.service.ts
import { Injectable } from '@angular/core';
import { HttpClient, HttpErrorResponse  } from '@angular/common/http';
import { Observable } from 'rxjs/Observable';
import 'rxjs/add/observable/merge';
import 'rxjs/add/operator/map';
@Injectable()
export class MyUserServService {
  constructor(private http: HttpClient) { }
  getIpAddress() {
      return this.http
            .get('http://ipstack.com')
            .map(response => response || {})
            .catch(this.handleError);
  }
  private handleError(error: HttpErrorResponse):
      Observable<any> {
        console.error('observable error: ', error);
        return Observable.throw(error);
    }
}
Used the Service in your user components 
–-user.component.ts
import { Component, OnInit } from '@angular/core';
import {MyUserServService} from '../my-user-serv.service';
@Component({
  selector: 'app-user',
  templateUrl: './user.component.html',
  styleUrls: ['./user.component.css']
})
export class UserComponent implements OnInit {
  constructor(private userService: MyUserServService) { }
  ngOnInit(): void {
    console.log("ip");
    this.userService.getIpAddress().subscribe(data => {
      console.log(data);
    });
  }
}
The Result Looks like –
{
"ip":"122.177.88.235",
"country_code":"IN",
"country_name":"India",
"region_code":"UP",
"region_name":"Uttar Pradesh",
"city":"Ghaziabad",
"zip_code":"201001",
"time_zone":"Asia/Kolkata",
"latitude":28.6667,
"longitude":77.4333,
"metro_code":0
}