The 256 area code is northern Alabama — Huntsville, Decatur, Athens, Madison, Florence, Gadsden, and Anniston all dial it — a code split from 205 on March 23, 1998 that has shared its entire footprint with the 938 overlay since July 10, 2010, so every local call takes ten digits. NANPA’s numbering database dates the assignment to October 10, 1997 and today lists both codes unflagged, with an exhaust horizon in 2043.
An out-of-nowhere 256 call generally means north Alabama on the line — a Huntsville, Decatur or Gadsden number, or its 938 twin — and nothing more: caller ID spoofing manufactures a Huntsville look from anywhere.
256 at a glance
| Quick fact | Answer |
|---|---|
| In service since | March 23, 1998 |
| Split from | 205, March 23, 1998 |
| Overlay | 938, in service July 10, 2010 |
| Territory anchors | Huntsville, Decatur, Florence, Gadsden, Anniston |
| Dialing | 10-digit local calls (mandatory since June 5, 2010) |
| Exhaust projection | 2Q 2043 for the combined 256/938 pool |
Most numbering forecasts age like weather reports. The letter that created this code predicted it would need help in about twelve years — and twelve years later, almost to the season, the help arrived. Between the 1998 split and the 2010 overlay sits one of the few NANPA projections that landed where it aimed, and the paper trail runs straight through Huntsville.
Three digits for the Tennessee Valley
The code’s spine follows the Tennessee River across the top of the state: Florence and Sheffield in the northwest corner, then Decatur, Athens, Madison, and Huntsville midstream, with Guntersville and Scottsboro where the river bends toward the Georgia line. NANPA’s overlay letter, PL-389, sums the territory as the northeastern portion of Alabama and names Anniston, Florence, Gadsden, and Huntsville as its markers. All of it keeps Central Time.
The map has a tail. Below the river towns, the boundary hugs the 205 line southward through Gadsden and Anniston, then keeps going — Talladega, Sylacauga, Alexander City, Dadeville — so the code wraps around Birmingham’s eastern flank rather than stopping in the hills. Cullman and Hanceville hold the southwest corner. Since 2010, every one of those rate centers issues numbers under two codes, 256 and 938, on identical terms.
One BellSouth spring, four new codes
Planning Letter PL-NANP-110 (February 3, 1998) drew the split: the Huntsville LATA and the northeastern slice of the Birmingham LATA would take the new 256, while Birmingham and Tuscaloosa kept 205. The cutover came at 12:01 a.m. Central on Monday, March 23, 1998, opening a grace period in which either code completed a call into the new territory. That window closed on September 28, 1998, after which misdials met a recording.
Alabama wasn’t alone on the calendar. PL-NANP-114 records BellSouth working four splits in the same late-March window — 828 leaving 704, 843 leaving 803, and 252 leaving 919 alongside Alabama’s — with the company’s billing and ordering systems converted for all four between April 23 and 26, 1998. Carriers could rehearse early: a test line at 256-532-5126 answered with a recording from February 23 on.
PL-110 also did the arithmetic on what it had created: the trimmed 205 was projected to exhaust in roughly eight years, the new 256 in about twelve. Local dialing, meanwhile, stayed at seven digits on both sides of the boundary — the standard outcome of a split, as our guide to how area codes work explains.
Why did the 938 overlay arrive right on schedule?
Because the twelve-year estimate held. On March 3, 2009 — eleven years after the split — the Alabama Public Service Commission approved an all-services overlay for 256 in Docket 31095, and NANPA’s database logs the relief code, 938, assigned the following day. Planning Letter PL-389 (April 28, 2009) published the timetable, and none of its dates slipped.
Permissive ten-digit dialing opened November 7, 2009; mandatory dialing arrived June 5, 2010; and 938 took effect on July 10, 2010, its prefixes orderable through NANPA from January 10 of that year. Because the footprint spans two LATAs, NANPA published a test number for each — 938-926-2222 on the Birmingham-side LATA, 938-946-4444 on Huntsville’s — live from April 10 through August 10, 2010. No existing number changed a digit.
That punctuality is the family anomaly. In Birmingham, the 659 overlay was ordered in 2001, then suspended for seventeen years when number pooling rewrote the math. In Montgomery, 334 ran thirty-one years before its 483 overlay landed this February. The Huntsville code alone took relief on the schedule its birth papers implied — early enough that the change never became an emergency.
The dialing change that beat 988 by eleven years
Every local call in the footprint has been ten digits since June 5, 2010. NANPA’s current plan lists ten-digit local and 1-plus-ten toll dialing for both codes, with 1-plus-ten on local calls allowed at each provider’s discretion.
When the 988 crisis line later pushed 82 seven-digit codes onto ten-digit dialing — the list in Planning Letter PL-556 (January 8, 2021), which superseded PL-544 — Alabama appeared exactly once, for 251, whose mandatory date fell on October 24, 2021. North Alabama had cleared that bar back when the first 938 prefixes lit up.
The 2043 line and its wobble
NANPA’s April 2026 NPA Exhaust Analysis carries the combined 256/938 prefix supply through the second quarter of 2043 — three quarters beyond the October 2025 forecast — and the July 6, 2026 revision list stopped at four Texas complexes, leaving Alabama’s dates where they were. Jeopardy and relief columns alike sit blank for the pair.
Read a few studies back, though, and the date wanders: first quarter of 2042 in late 2024, out to fourth quarter 2044 the next spring, back to 2042, now 2043. The code that once proved a NANPA forecast right now owns one that can’t quite sit still — though none of those four readings puts the horizon closer than 2042. Within Alabama it remains the tightest of the three overlay pairs: Birmingham’s 205/659 runs to 2066 and Montgomery’s 334/483 to 2064, and only the un-overlaid 251, at 2039, sits on a shorter clock.
Huntsville digits on the display
A north Alabama campaign — collections into Decatur, appointment-setting for Huntsville contractors, service routes through Gadsden — gets measurably further when the display shows a code the region recognizes, and the numbers behind that effect are in our local presence dialing guide. Here, 256 and 938 carry equal weight: same rate centers, same cost, different vintage. What the digits can’t do is vouch for themselves, because caller ID spoofing manufactures a Huntsville look from anywhere.
The vouching happens at the carrier layer, and that is where SIPNEX sits — FCC-licensed directly, not reselling. It provisions local DID numbers by rate center, north Alabama included when inventory allows, delivers them over SIP trunking to whatever PBX or dialer already runs the operation, and signs outbound traffic at the A level under a STIR/SHAKEN certificate held in its own name. Toll-free, where the playbook wants one, runs through SIPNEX’s RespOrg registration.
Getting specific about the 256 area code
What territory does the 256 area code serve?
Northern Alabama, on Central Time: the Tennessee River cities — Florence, Sheffield, Decatur, Athens, Madison, Huntsville, Guntersville, Scottsboro — plus an eastern arc through Gadsden, Anniston, Talladega, Sylacauga, and Alexander City, with Cullman to the southwest. NANPA’s PL-389 calls it the state’s northeastern portion; Birmingham and Tuscaloosa dial 205/659, Montgomery 334/483.
Are 256 and 938 numbers interchangeable?
Yes — 938 is an all-services overlay of the identical territory, so the two codes differ only in when their prefixes were issued. The Alabama PSC approved the overlay in Docket 31095 on March 3, 2009, and 938 has been in service since July 10, 2010 under Planning Letter PL-389. Coverage, dialing, and cost are the same, and no existing number changed when the second code arrived.
Has the 256 area code always required ten-digit dialing?
No — local calls were seven digits from the March 1998 split until June 5, 2010, when the overlay’s mandatory dialing date took effect. Ten digits have been required ever since, with 1-plus-ten permitted at each provider’s discretion. The 2021 conversions for the 988 crisis line never involved this code: Alabama’s only entry on PL-556’s 82-code list was 251.
What is the exhaust forecast for the 256 area code?
Second quarter of 2043 for the combined 256/938 pool, per NANPA’s April 2026 NPA Exhaust Analysis — three quarters later than the October 2025 study projected. The July 6, 2026 revision list was confined to four Texas complexes, so the Alabama date stands, and neither code is in jeopardy or under relief planning.
Does a business need an Alabama address for a 256 area code number?
No — a number is local because of the rate center it issues from, not the address on the account. A Huntsville or Decatur DID delivered over SIP rings an office in any state — SIPNEX stocks local DID numbers across US markets, subject to each rate center’s inventory, and routes them to the systems a team already runs.
Numbers this valley has answered since 1998, backed by a carrier that answers for them: SIPNEX issues 256-area DIDs by rate center under its own FCC license, lands them over SIP trunks, and signs every outbound leg A-level on a certificate it holds itself. Rates are posted, the contact page reaches the network team, and (833) 665-2220 gets picked up.
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