SMTP VS TCP/IP
As of 30 October 2026, TCP/IP is named by 4,211 companies and SMTP by 343; SMTP skews to companies under 200 people (41% vs 45%), TCP/IP to companies over 1,000 (28% vs 36%).
As of 30 October 2026 · refreshed daily · counts move as websites, DNS and career sites are re-read.
The website-and-DNS footprint is not comparable between a marketing suite and a CRM: SMTP's script and mail records show on hundreds of thousands of small sites, TCP/IP rarely leaves a trace outside its own apps. Compare on the job-posting numbers; use the footprint for reach.
- SMTP: 2–200 employees
- 41%
- TCP/IP: 2–200 employees
- 45%
- SMTP: 1,000+ employees
- 36%
- TCP/IP: 1,000+ employees
- 28%
- Postings per company, 90 days
- 2.1 · 3.1
- Website or DNS footprint
- 0 · 0
Who chooses which
Share of each tool's companies in every segment. "Leans" marks a gap of more than two points.
| Segment | SMTP | share | TCP/IP | share | Leans |
|---|---|---|---|---|---|
| 2-10 employees | 15 | 4% | 250 | 6% | even |
| 11-50 employees | 73 | 21% | 670 | 16% | SMTP |
| 51-200 employees | 51 | 15% | 959 | 23% | TCP/IP |
| 201-500 employees | 46 | 13% | 676 | 16% | TCP/IP |
| 501-1000 employees | 33 | 10% | 427 | 10% | even |
| 1001-5000 employees | 65 | 19% | 661 | 16% | SMTP |
| 5001-10000 employees | 24 | 7% | 189 | 4% | SMTP |
| 10,001+ employees | 36 | 10% | 350 | 8% | SMTP |
| Self-employed | – | – | 29 | 1% | outside top 12 |
| Segment | SMTP | share | TCP/IP | share | Leans |
|---|---|---|---|---|---|
| Technology & software | 198 | 58% | 1,778 | 42% | SMTP |
| Business & finance services | 60 | 17% | 675 | 16% | even |
| Manufacturing & industry | 27 | 8% | 680 | 16% | TCP/IP |
| Public, community & associations | 13 | 4% | 107 | 3% | even |
| Utilities & infrastructure | 11 | 3% | 221 | 5% | TCP/IP |
| Commerce & trade | 10 | 3% | 116 | 3% | even |
| Consumer services & leisure | 8 | 2% | 109 | 3% | even |
| Media & content | 5 | 1% | 100 | 2% | even |
| Property & construction | 3 | 1% | 133 | 3% | TCP/IP |
| Transport, logistics & rental | 3 | 1% | 67 | 2% | even |
| Health care | 2 | 1% | 119 | 3% | TCP/IP |
| Hospitality & travel | 2 | 1% | – | – | outside top 12 |
| Automotive | – | – | 71 | 2% | outside top 12 |
| Segment | SMTP | share | TCP/IP | share | Leans |
|---|---|---|---|---|---|
| United States | 213 | 62% | 2,421 | 57% | SMTP |
| United Kingdom | 20 | 6% | 250 | 6% | even |
| France | 15 | 4% | 168 | 4% | even |
| Canada | 13 | 4% | 117 | 3% | even |
| India | 11 | 3% | 96 | 2% | even |
| Italy | 11 | 3% | 69 | 2% | even |
| Germany | 8 | 2% | 322 | 8% | TCP/IP |
| Poland | 8 | 2% | 65 | 2% | even |
| Belgium | 5 | 1% | – | – | outside top 12 |
| Australia | 4 | 1% | 54 | 1% | even |
| Singapore | 4 | 1% | – | – | outside top 12 |
| Brazil | 3 | 1% | 58 | 1% | even |
| Netherlands | – | – | 51 | 1% | outside top 12 |
| Spain | – | – | 46 | 1% | outside top 12 |
| Segment | SMTP | share | TCP/IP | share | Leans |
|---|---|---|---|---|---|
| IT operations & business systems | 587 | 49% | 7,438 | 42% | SMTP |
| Software engineering | 186 | 16% | 4,419 | 25% | TCP/IP |
| Customer service & success | 58 | 5% | 764 | 4% | even |
| Engineering (non-software) | 56 | 5% | 1,517 | 8% | TCP/IP |
| Sales | 41 | 3% | 461 | 3% | even |
| Data & AI | 25 | 2% | 77 | 0% | even |
| Quality, safety & environment | 12 | 1% | 30 | 0% | even |
| Product, program & project management | 11 | 1% | 149 | 1% | even |
| Marketing & communications | 5 | 0% | – | – | outside top 12 |
| General management & consulting | 4 | 0% | 27 | 0% | even |
| Logistics warehouse and transport | 4 | 0% | – | – | outside top 12 |
| Skilled trades and field service | 3 | 0% | 380 | 2% | even |
| Education & training | – | – | 26 | 0% | outside top 12 |
| Arts media and entertainment | – | – | 24 | 0% | outside top 12 |
The companies behind each column
Companies using SMTP →
Companies using TCP/IP →
network protocols ranked →
Quote the sentence with the date and the link. The numbers change daily; the link always shows the current ones.
TCP/IP is named by 4,211 companies in job postings and SMTP by 343; 265 name both. (Breaknorm, 30 October 2026, https://breaknorm.co/compare/smtp-vs-tcp-ip)
Read from the source, not self-reported
Every number on this page can be traced to a page we crawled or a posting we read. Full methodology →
- Job postingsRead hourly from career sites. A tool counts when the employer's own text names it as the team's system; both tools can count for one company.
- Website and DNSScripts and embeds on the company's pages, plus SPF, DKIM, MX and CNAME records of its domain that point at the vendor.
- SegmentsCountry, size and industry from the company profile built from its website.
- Not a reviewNo ratings, prices or feature claims. For those, read the vendors.
SMTP vs TCP/IP: questions
Which is more used, SMTP or TCP/IP?
By companies naming it in their own job postings, TCP/IP (4,211) over SMTP (343). By website-and-DNS footprint, TCP/IP (0 vs 0), because its scripts and mail records sit on many small company sites.
Who chooses SMTP?
41% of SMTP companies have 2 to 200 employees, against 45% for TCP/IP. 36% of SMTP companies have over 1,000 employees, against 28% for TCP/IP.
Do companies run both?
265 companies name both in their postings, usually SMTP in marketing and TCP/IP in sales, or during a migration.
Where do these numbers come from?
From the employer's own text in job postings read hourly from career sites, and from scripts found on company websites in our crawl. No vendor data, no surveys.
Get either list your way
The same data as a search, over MCP and the API, as bulk files, or pushed to you as it changes.
Every company on either tool,
with the person who owns it
Filter on SMTP or TCP/IP. Start free, no card.