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About Neutral Tandem

Neutral Tandem operates as a neutral tandem provider, interconnecting competitive carriers including wireless, wireline, cable, and VoIP providers for local and long-distance traffic exchange, bypassing incumbent LEC tandems. It primarily serves wholesale carriers seeking diverse routing and PSTN gateway access across major US markets, connecting over 600 switches and 130 million numbers. The company has expanded globally with voice and data services following acquisitions.

Sources: Neutral Tandem - Products, Competitors, Financials, Employees ... · [PDF] Tandem Diversity and the Public Switched Telephone Network: Neutral Tandem: An Independent Solution for Tandem Diversity · Interview with Neutral Tandem - YouTube

Toll-free side: Related toll-free RespOrg: Inteliquent (code HPC01). View on resporgs.com →

Headquarters: Chicago, IL

From Onvoy LLC (OCN 224C), the largest member of the Neutral Tandem group.

Street view of Neutral Tandem HQ
Street view
Satellite view of Neutral Tandem HQ
Satellite

Carrier website

Homepage screenshot of Neutral Tandem sinch.com: opens in a new tab

Block portfolio at a glance

By age

Recent: 1,100Medium: 4,616Old: 21,211Undated: 73727,664blocks
  • Recent (1,100). Last 18 mo
  • Medium (4,616)
  • Old (21,211)
  • Undated (737)

Footprint by state

Stronger blue = more blocks issued in that state. ● marks states with activity in the last 18 months.

HawaiiAlaskaFloridaSouth CarolinaGeorgiaAlabamaNorth CarolinaTennessee (TN): 3,788 blocks: 166 recentRhode IslandConnecticutMassachusettsMaine (ME): 373 blocks: 1 recentNew Hampshire (NH): 219 blocks: 7 recentVermontNew YorkNew JerseyPennsylvaniaDelawareMarylandWest VirginiaKentucky (KY): 2,918 blocks: 69 recentOhio (OH): 7,228 blocks: 392 recentMichiganWyomingMontana (MT): 905 blocks: 4 recentIdaho (ID): 1,302 blocks: 12 recentWashingtonTexasCaliforniaArizonaNevadaUtahColoradoNew MexicoOregonNorth DakotaSouth Dakota (SD): 513 blocks: 8 recentNebraskaIowaMississippi (MS): 2,104 blocks: 35 recentIndianaIllinois (IL): 8,313 blocks: 406 recentMinnesotaWisconsinMissouriArkansasOklahomaKansasLouisianaVirginiaDistrict of Columbia

Top area codes

Bars show total blocks; red overlay is recent.

217998 / 22208976 / 11224937 / 34406905 / 4618893 / 8662884 / 9740860 / 25567852 / 13234846 / 43270817 / 11309796 / 7606789 / 1

Block assignments by year

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Best vanity numbers from Neutral Tandem's recent issuances

Numbers in blocks issued in the last 18 months whose digits spell a useful word. Filter by state and category to find one for your business. ★ marks Mike's curated standouts.

NumberSpellsCategoryStateBlock issued
(440) 266-7269 ★ COMPANY Business OH 2025-09-18
(440) 266-7883 ★ COMPUTER Computer / Hardware OH 2025-09-18
(601) 626-2436 ★ MANAGEMENT Pain Related MS 2025-04-18
(331) 344-4825 ★ DIGITAL News / Media / Communications IL 2026-02-02
(464) 256-8446 ★ CLOTHING Clothing / Apparel / Fabric IL 2025-02-05
(601) 236-8725 ★ CENTRAL Geography / Local / Directions MS 2025-12-11
(220) 277-2728 ★ APPARATUS VAN OH 2025-03-19
(380) 277-2728 ★ APPARATUS VAN OH 2025-12-17
(326) 242-7537 ★ CHARLES Male / Masculine Names OH 2025-12-11
(234) 468-3763 ★ INTERNET Internet Companies OH 2026-02-19
(440) 266-7858 ★ CONSULTING Consulting / Therapy / Planning OH 2025-09-18
(326) 244-5373 ★ CHILDREN Children / Daycare / Baby OH 2026-02-19
(220) 265-5343 ★ COLLEGE Education / College OH 2026-01-30
(326) 244-2246 ★ CHICAGO Geography / Local / Directions OH 2026-02-19
(224) 774-6833 ★ PRINTED Printing / Markers / Pens IL 2026-03-20
(220) 266-3828 ★ CONDUCTING Miscellaneous OH 2025-03-19
(234) 468-7866 ★ HOUSTON Geography / Local / Directions OH 2026-02-19
(234) 468-7464 ★ HOUSING Real Estate / Condos / Apartments OH 2026-02-19
(901) 783-7436 ★ STEPHEN Names / Nicknames TN 2025-10-06
(234) 468-7346 ★ HOUSEHOLD Home OH 2026-02-19
(220) 266-6372 ★ COMMERCIAL Business / Corporate OH 2026-03-11
(567) 366-8932 ★ FOOTWEAR Accessories / Bags / Shoes OH 2026-01-14
(872) 387-6488 ★ FURNITURE Furniture / Tables / Mattresses IL 2025-09-22
(234) 468-4362 ★ IN THE NATURE Miscellaneous OH 2026-02-19
(220) 277-5422 ★ APPLICATION General OH 2025-03-19
(234) 467-8786 ★ INSTRUMENTS Technical / Electronics OH 2026-02-19
(234) 467-8726 ★ INSURANCE Insurance OH 2026-02-19
(216) 247-7678 ★ AIRPORT Aviation / Airlines / Flying OH 2025-09-25
(220) 277-2735 ★ APPAREL Clothing / Apparel / Fabric OH 2025-03-19
(380) 277-2735 ★ APPAREL Clothing / Apparel / Fabric OH 2025-12-17

Want one of these or something similar? Request the number from this carrier and we'll route the request.

Member OCNs

10 OCNs roll up under Neutral Tandem.

OCNCompany name on fileHQTypeTotalRecent
224C Onvoy LLC Chicago, IL Competitive Local Exchange Carrier 8,314 406
464C Onvoy LLC - OH Chicago, IL Competitive Local Exchange Carrier 7,228 392
525E Onvoy LLC - TN Chicago, IL Competitive Local Exchange Carrier 3,788 166
896E Onvoy LLC - KY Chicago, IL Competitive Local Exchange Carrier 2,918 69
719E Onvoy LLC - MS Chicago, IL Competitive Local Exchange Carrier 2,104 35
689F Onvoy LLC - ID Chicago, IL Competitive Local Exchange Carrier 1,302 12
453F Onvoy LLC - MT Chicago, IL Competitive Local Exchange Carrier 905 4
162G Onvoy LLC - SD Chicago, IL Competitive Local Exchange Carrier 513 8
454F Onvoy LLC - ME Chicago, IL Competitive Local Exchange Carrier 373 1
637E Onvoy LLC - NH Chicago, IL Competitive Local Exchange Carrier 219 7