How to set up a proxy in Nstbrowser: Custom Proxy, proxy groups and fixes

To add a proxy in Nstbrowser, open the profile's Proxy tab, choose Custom Proxy, paste the line into Proxy URL as host:port:user:pass, set Protocol to http for port 8080 or socks5 for port 1080, click Check Proxy and create the profile. Give every profile its own sticky session. Below: each step, ISP and mobile lines, proxy groups and fixes.

Nstbrowser keeps every browser profile apart: its own cookies, its own fingerprint and, once you set one, its own proxy. The proxy decides which IP address and which country the sites see, and Nstbrowser then sets the profile's language, time zone and geolocation from that IP. The field names below are the ones in Nstbrowser's own documentation and in its current app, and the values come from the QuanticData endpoint generator.

What you need before you start

• Nstbrowser installed, with an account. The proxy settings below are on the Proxy tab of Profile Create, the screen that opens when you create or edit a profile.
• A proxy plan. Residential Premium, ISP or mobile: all of them work in Nstbrowser. Nstbrowser's FAQ is clear that you buy and configure proxies yourself; Local means no proxy, the profile uses your own IP (or your VPN's).
• The four values: host, port, username and password. In the QuanticData dashboard they are under My proxies, on the plan's page, in the Endpoint generator (Residential Premium and mobile) or under Assigned IPs (ISP).

The proxy formats Nstbrowser accepts

The Proxy URL field takes one line and splits it into Protocol, Host and Port, Proxy Username and Proxy Password. Nstbrowser's documentation gives two rules:

• HTTP and HTTPS: host:port:username:password, exactly what the generator gives with the output format host:port:user:pass.
• SOCKS5: the same line with socks5:// at the start. A line without a type is read as HTTP.
• In a proxy group (the Add Proxies dialog) the formats also include user:pwd@host:port with a scheme in front, and an optional alias at the end of the line, up to 30 characters, to tell the lines apart.
• Hosts: domain names and IPv4 addresses work; Nstbrowser does not take an IPv6 address as the host.

The same QuanticData proxy, for Denmark, both ways:

# HTTP, port 8080
residentialpremium.quantumproxies.io:8080:USER-country-dk-sid-p01-ttl-60m:PASS

# SOCKS5, port 1080: the prefix sets the type
socks5://residentialpremium.quantumproxies.io:1080:USER-country-dk-sid-p01-ttl-60m:PASS

The username is the whole string, everything after the first dash included: -country-dk picks the exit country, -sid-p01 names the session and -ttl-60m keeps it for 60 minutes. Copy it whole. A username cut at the first dash still authenticates, but the profile then leaves from a random country on a new IP at every request.

Step by step: add a Residential Premium proxy to an Nstbrowser profile

1. Generate the line. In the QuanticData dashboard open My proxies, then your plan. In the Endpoint generator choose the Country (and a Region or City if the profile needs one), set Session to Sticky, set Session TTL (minutes) to at least the time the profile stays open, choose the Protocol and keep the Output format on host:port:user:pass. The Preview shows the line.
2. Open Profile Create in Nstbrowser. On the Profiles screen click Create Profile (or edit a profile) and open the Proxy tab.
3. Choose Custom Proxy, then Custom. Proxy Setup has three choices: Custom for a new line, Saved Proxies and Saved Proxy Group for lines stored on the Proxies screen.
4. Paste the line into Proxy URL. Nstbrowser fills Host and Port, Proxy Username and Proxy Password from it.
5. Check the Protocol. http for port 8080, socks5 for port 1080. If you pasted a socks5:// line, the protocol comes from the line.
6. Click Check Proxy. The IP Checker is Nstbrowser by default; the documentation also lists iplook and ipinfo. The result shows the exit IP, the country and the time zone, and the country has to match the -country- in the username.
7. Click Create Profile. Language, time zone and geolocation follow the proxy's IP unless you change them on the other tabs.

The check behind this screen ran through a sticky Residential Premium line for Denmark on 23 October 2026: the exit was a home connection in Svendborg, South Denmark, time zone Europe/Copenhagen. That is the time zone Nstbrowser gives the profile.

One sticky session per profile

An antidetect profile is meant to look like one person on one connection. A rotating proxy changes IP on every request, which suits scraping and breaks a profile that logs in. A sticky session keeps one IP for as long as the session lives, and the session lives in the username, so the line never has to change once it is saved in the profile.

# profile 1: Denmark, one session for a working day
residentialpremium.quantumproxies.io:8080:USER-country-dk-sid-p01-ttl-480m:PASS

# profile 2: same plan, its own session (never reuse p01)
residentialpremium.quantumproxies.io:8080:USER-country-dk-sid-p02-ttl-480m:PASS

# profile 3: Denmark, open all day
residentialpremium.quantumproxies.io:8080:USER-country-dk-sid-p03-ttl-1440m:PASS

• A different session ID in every profile. Two profiles on the same line share one IP, which is what an antidetect browser is there to avoid.
• A lifetime longer than the work. The generator accepts up to 1440 minutes, a full day. When the session ends, the next request gets a new IP, and a site can see that as a new login location.
• The country in the username. Without -country- the exit can be anywhere, and the profile's time zone will not be the one you planned.

With Session set to Sticky, the generator makes as many lines as the Quantity field says, ten by default, each with its own session ID; Copy all or Download takes them out in the same format. One line per profile.

Saved Proxies or Saved Proxy Group

Once your lines are stored on the Proxies screen, Proxy Setup offers two ways to use them, and they behave differently at every launch:

• Saved Proxies binds the profile to one line. It keeps that line, so it keeps its sticky session and its IP from one launch to the next. This is the choice for accounts.
• Saved Proxy Group binds the profile to a whole group, and Nstbrowser picks a random proxy from the group every time the profile starts. The IP changes between launches. Use it only where a new IP per launch is the goal.

ISP proxies in Nstbrowser

An ISP plan gives fixed addresses: the same IP for as long as the plan runs, which suits accounts that should not change location for months. In the QuanticData dashboard they are listed under Assigned IPs, where Protocol (HTTP / HTTPS or SOCKS5) and Output format (IP:Port:Username:Password) set the lines that Copy selected and Export .txt take out.

1. Copy one line from Assigned IPs, in the format IP:Port:Username:Password.
2. Paste it into Proxy URL under Custom Proxy, Custom. Host and Port show the fixed IP and its port.
3. Keep Protocol on http when the panel is on HTTP / HTTPS; for SOCKS5, switch the panel and Nstbrowser to SOCKS5 together.
4. Check Proxy, then Create Profile. The next profile takes the next IP from the list: one IP per profile.

Mobile proxies in Nstbrowser

A mobile line goes in exactly like a Residential Premium one: host:port:user:pass in Proxy URL, http on 8080 or socks5 on 1080, one sticky session per profile. The host is mobile.quantumproxies.io and the username carries -type-mobile:

# mobile, Denmark, sticky for an hour
mobile.quantumproxies.io:8080:USER-country-dk-type-mobile-sid-m01-ttl-60m:PASS

In the mobile generator you also choose the gateway, Global, USA, EU or Asia, and mobile plans offer IP whitelist authentication: add your own IP, then use the host:port list with no username or password, which Nstbrowser accepts with an empty Proxy Username and Proxy Password. For a new mobile IP, generate a line with a new session ID; nothing in Nstbrowser needs a change-IP link.

Which proxy type for which profile

Proxy type	In Nstbrowser	Good for
Residential Premium	One sticky line per profile under Custom Proxy or Saved Proxies; country, region, city or ISP in the username; HTTP 8080 or SOCKS5 1080	Most profiles: home IPs in the country you choose
ISP	Fixed IPs from Assigned IPs as IP:Port:Username:Password; one IP per profile	Long-lived accounts that should keep the same address for months
Mobile	One sticky line per profile with -type-mobile in the username; Global, USA, EU or Asia gateway; HTTP 8080 or SOCKS5 1080; IP whitelist available	Phone-first platforms and accounts tied to mobile networks

For a wider view of why each profile needs its own address, see residential proxies for antidetect browsers and mobile proxies for antidetect browsers. The plans themselves are on the pages for QuanticData residential proxies, ISP proxies and QuanticData mobile proxies.

Many profiles at once: proxy groups

1. Make the lines. In the generator set Session to Sticky and the Quantity you need, generate, then Copy all or Download. For ISP, Copy selected under Assigned IPs.
2. Create a group. In Nstbrowser open Proxies in the left menu, choose the custom type and click Create Group, then open the group.
3. Add Proxies. Paste one line per profile, up to 100 per submission. Put an alias at the end of each line, such as :dk-01, so the profiles list shows which line is which, and start SOCKS5 lines with socks5://. Save.
4. Check Proxy, then Clear Failed. Check Proxy tests every line in the group and keeps the result; Clear Failed removes the lines that failed.
5. Assign the lines. Pick one line per profile with Saved Proxies, or use Batch Create, which makes up to 500 profiles in one go from saved proxies or groups. To change the proxy of profiles that already exist, select them on the Profiles screen, click the three dots above the list and choose Modify Proxy.

One warning from Nstbrowser's documentation: deleting a group deletes every proxy in it, and the profiles that used one of them lose their proxy setting.

A new IP without touching the rest of the profile

With Residential Premium and mobile, the IP is tied to the session ID in the username. A new session ID, -sid-p02 instead of -sid-p01, is a new IP: edit the profile, paste the new line into Proxy URL under Custom, or pick another saved line, and save. The old line keeps working until its lifetime ends. ISP proxies are static addresses by design: one IP per profile, for months.

Nstbrowser proxy not working: errors and fixes

When Check Proxy fails, Nstbrowser shows a failed result where Check Success would be, and in a proxy group the line counts as failed. Nstbrowser's FAQ names the usual causes: the proxy or its settings, your local network, network problems in between, and the profile's own settings. These are the cases behind them, in the order to check.

What you see	Usual cause	Fix
The check fails on a line with port 1080	The line has no socks5:// prefix, so it is read as HTTP on the SOCKS5 port	Set Protocol to socks5, or add socks5:// to the line, or use port 8080 with http
The check fails with the right protocol	The username was cut, a colon is missing, or a space came with the paste	Copy the line again from the generator's Preview and paste it whole
It worked yesterday, fails today	The plan expired or its traffic is used up	Check the plan in My proxies: status, remaining traffic, expiry date
Wrong country or time zone	No -country- in the username, or Worldwide chosen in the generator	Generate the line with a country; leave language and time zone on the IP
The IP changes between launches	The profile uses a Saved Proxy Group, which picks at random, or the session lifetime ended	Saved Proxies with one line per profile, and a longer -ttl-
Lines vanished from a profile	Their proxy group was deleted	Add the lines again and assign them with Saved Proxies or Modify Proxy

Two more places to look. Nstbrowser keeps proxy logs for each profile under Environment Logs, which show what happened when the profile started. And one test outside the browser settles most cases in a minute: if this returns an address in the right country, the proxy works and the problem is in the profile's fields.

curl -x http://residentialpremium.quantumproxies.io:8080 \
  -U "USER-country-dk-sid-test-ttl-10m:PASS" https://ipinfo.io/json

If the same command fails on your network but works from another one, a firewall or your provider is blocking the connection to the proxy port, which is the local-network cause in Nstbrowser's list.

HTTP or SOCKS5 in Nstbrowser

Both work for browsing, and every QuanticData network offers both. HTTP on port 8080 is the simpler choice and the one to start with. SOCKS5 on port 1080 passes any kind of connection, not only web pages, which matters for tools inside the profile that do not speak HTTP; the details are on the page for SOCKS5 proxies. What breaks a profile is never the choice itself, only a type that does not match its port.

Before you run accounts

A proxy changes where a profile's traffic comes from, not what the profile is allowed to do. Keep to each platform's terms and to the law where you work, and use one profile, one session and one identity per account.